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medmcqa
medmcqa_05_02293
The primary function of Toll like Receptors is?-
[ "Vasodilation", "Activation of Immune System", "Regulation of Calcium channel", "Second Messenger" ]
B
Toll-like receptors (TLRs) are microbial sensors that are named for the founding member called Toll, which was discovered in Drosophila. There are ten mammalian TLRs, which recognize products of bacteria (such as endotoxin and bacterial DNA), viruses (such as double-stranded RNA), and other pathogens . TLRs are located...
sciq
sciq_01_04073
When sand is deposited along a shoreline, what is created?
[ "bay", "beach", "island", "dunes" ]
B
Sand deposited along a shoreline creates a beach.
sciq
sciq_01_05475
The lunar landscape is covered by craters caused by what?
[ "asteroid impacts", "water", "earth impacts", "volcanoes" ]
A
The landscape of the Moon - its surface features - is very different from Earth. The lunar landscape is covered by craters caused by asteroid impacts ( Figure below ). The craters are bowl-shaped basins on the Moon’s surface. Because the Moon has no water, wind, or weather, the craters remain unchanged.
medmcqa
medmcqa_05_03709
Most common tumor to extend from intracranial to orbit is -
[ "Astrocytoma", "Pituitary adenoma", "Craniopharyngioma", "Sphenoidal wing meningioma" ]
D
Ans. is 'd' i.e., Sphenoidal wing meningioma "Meningiomas are the most common intracranial tumor to extend to the orbit",..............Ophthalmic oncologyo Meningiomas commonly arise from the dura of sphenoid wing, i.e. sphenoid wing meningioma.
openbookqa
obqa_02_01659
A moth can adjust its
[ "age", "ancestry", "shape", "genus" ]
C
a moth undergoes metamorphosis
openbookqa
obqa_02_00815
Which is needed for photosynthesis to occur
[ "chemical with the atomic number 18", "energy that takes 8.3 minutes to travel to Earth", "the 8th entry on the periodic table", "the most prevalent chemical in the atmosphere" ]
B
photosynthesis means green plants convert from carbon dioxide, water, and solar energy into oxygen for themselves
math_qa
mathqa_03_00173
what is the area of a square field whose diagonal of length 30 m ?
[ "287", "269", "450", "200" ]
C
"d 2 / 2 = ( 30 * 30 ) / 2 = 450 answer : c"
sciq
sciq_01_11533
Energy is absorbed in the process of converting a liquid at its boiling point into a what?
[ "plasma", "solid", "mesh", "gas" ]
D
Energy is absorbed in the process of converting a liquid at its boiling point into a gas. As with the melting of a solid, the temperature of a boiling liquid remains constant and the input of energy goes into changing the state. The molar heat of vaporization of a substance is the heat absorbed by one mole of that subs...
sciq
sciq_01_07014
A synergist that makes the insertion site more stable is called a what?
[ "kilocalorie", "lesion", "dominator", "fixator" ]
D
CHAPTER REVIEW 11.1 Interactions of Skeletal Muscles, Their Fascicle Arrangement, and Their Lever Systems Skeletal muscles each have an origin and an insertion. The end of the muscle that attaches to the bone being pulled is called the muscle’s insertion and the end of the muscle attached to a fixed, or stabilized, bon...
medmcqa
medmcqa_05_00932
A child age 5 years, presents with loss of vision and mild proptosis of left eye . On examination direct is absent but consensual is present in left eye. He is having:
[ "Optic nerve glioma", "Optic sheath meningioma", "Retinoblastoma", "Optic disc angioma" ]
A
A i.e. Optic nerve glioma
ARC-Challenge
arc_04_02484
Which is a hypothesis that can be easily tested?
[ "The Moon causes high tides.", "During which season are the tides the highest?", "What is the phase of the Moon when tides are highest?", "When the Moon is full, the tides will be at their highest." ]
D
null
sciq
sciq_01_07105
Which process acts as a natural complement for cellular respiration?
[ "glycolysis", "absorption", "atherosclerosis", "photosynthesis" ]
D
Photosynthesis and cellular respiration are connected through an important relationship. This relationship enables life to survive as we know it. The products of one process are the reactants of the other. Notice that the equation for cellular respiration is the direct opposite of photosynthesis :.
math_qa
mathqa_03_00841
matt gets a $ 1,300 commission on a big sale . this commission alone raises his average commission by $ 150 . if matt ' s new average commission is $ 400 , how many sales has matt made ?
[ "3", "4", "5", "6" ]
D
"let , average commission = x no . of items sold = y total commission = xy new commission = xy + 1300 new average = ( xy + 1300 ) / ( y + 1 ) = 150 + x i . e . ( xy + 1300 ) = ( y + 1 ) * ( 150 + x ) i . e . ( xy + 1300 ) = ( xy + x + 150 y + 150 ) i . e . ( 1150 ) = ( x + 150 y ) new commission = 400 = 150 + x i . e ....
medmcqa
medmcqa_05_00741
Enzyme deficient in occulocutaneous albinism type 1 is -
[ "Tyrosinase", "Pink protein", "Tyrosinase related protein 1", "Membrane associated transport protein (MATP)" ]
A
Ans. is 'a' i.e., Tyrosinase Characteristics of AlbinismDiseaseChromosomeGene locusProtein {Biogenesis of lysome-related Organelles complex (BLOC)]Distinguishing signsOculocutaneous albinism type 11 lq21TYRTyrosinase/TYRType lA-no pigment Type 1 B-some pigmentOculocutaneous albinism type 215q11 2-q12PPink protein/PSome...
math_qa
mathqa_03_01336
pavan travelled for 15 hours . he covered the first half of the distance at 30 kmph and remaining half of the distance at 25 kmph . find the distance travelled by pavan .
[ "408 km", "409 km", "410 km", "412 km" ]
B
let the distance travelled be x km . total time = ( x / 2 ) / 30 + ( x / 2 ) / 25 = 15 = > x / 60 + x / 50 = 15 = > ( 5 x + 6 x ) / 300 = 15 = > x = 409 km answer : b
openbookqa
obqa_02_04796
It's wrong to
[ "pet a dog", "cuddle a dog", "love a dog", "stomp a puppy" ]
D
harming something has a negative effect on that something
openbookqa
obqa_02_00604
There are creatures which, depending on species, have varying numbers of body parts. Arachnids have a certain number, while humans have a different number, and these numerous parts can be attributed to
[ "survival", "environmental growth", "inherited characteristics", "developmental abilities" ]
C
the number of body parts of an organism is an inherited characteristic
openbookqa
obqa_02_03165
If a seed is planted and it develops into a large tomato plant
[ "the seed came from a cucumber", "the seed came from something red", "the seed came from a tree", "the seed came from a bird" ]
B
the type of seed of a plant is an inherited characteristic
sciq
sciq_01_08518
A mixture of a metal with one or more other elements is called?
[ "a hydrogen", "a carbon", "a cobalt", "an alloy" ]
D
Steel is an example of an alloy. An alloy is a mixture of a metal with one or more other elements. The other elements may be metals, nonmetals, or both. An alloy is a solid solution. It is formed by melting a metal and dissolving the other elements in it. The molten solution is then allowed to cool and harden. Several ...
sciq
sciq_01_09211
How is the energy of an atomic orbital affected as the principal quantum number increases?
[ "it increases", "it decreases", "It triples", "It doubles" ]
A
Orbital Energies and Atomic Structure The energy of atomic orbitals increases as the principal quantum number, n, increases. In any atom with two or more electrons, the repulsion between the electrons makes energies of subshells with different values of l differ so that the energy of the orbitals increases within a she...
sciq
sciq_01_03580
What is the microtubule-organizing center found near the nuclei of animal cells?
[ "lysosome", "entrosome", "centrosome", "spliceosome" ]
C
Animal Cells versus Plant Cells At this point, you know that each eukaryotic cell has a plasma membrane, cytoplasm, a nucleus, ribosomes, mitochondria, peroxisomes, and in some, vacuoles, but there are some striking differences between animal and plant cells. While both animal and plant cells have microtubule organizin...
sciq
sciq_01_06799
What precious resource allows us to grow food as well as materials we turn into clothing and medicine?
[ "soil", "gasoline", "mercury", "petroleum" ]
A
Soil is a precious resource. It allows us to grow food and the materials we use to make everything from the shirt you have on to the medicine you took this morning. Soil is made up of small pieces of rock that have broken down over hundreds, if not thousands, of years. Soil is also partly made up of the remains of plan...
sciq
sciq_01_08042
How many amino acids are arranged like "beads on a string" to form proteins?
[ "25", "20", "15", "35" ]
B
Proteins are nutrients made up of smaller molecules called amino acids . Recall that there are 20 different amino acids arranged like "beads on a string" to form proteins. These amino acid chains then fold up into a three-dimensional molecule, giving the protein a specific function. Proteins have several important role...
math_qa
mathqa_03_00083
a 60 cm long wire is to be cut into two pieces so that one piece will be 2 / 5 th of the other , how many centimeters will the shorter piece be ?
[ "a", "b", "c", "d" ]
D
"explanation : 1 : 2 / 5 = 5 : 2 2 / 7 * 60 = 20 answer : option d"
sciq
sciq_01_07846
Extrusive igneous rocks are also called what?
[ "metamorphic", "magma minerals", "volcanic rocks", "agates" ]
C
Extrusive igneous rocks form above the surface. The lava cools quickly as it pours out onto the surface ( Figure below ). Extrusive igneous rocks cool much more rapidly than intrusive rocks. The rapid cooling time does not allow time for large crystals to form. So igneous extrusive rocks have smaller crystals than igne...
math_qa
mathqa_03_01147
the length of the bridge , which a train 250 metres long and travelling at 72 km / hr can cross in 30 seconds , is :
[ "200 m", "225 m", "245 m", "350 m" ]
D
"speed = [ 72 x 5 / 18 ] m / sec = 20 m / sec time = 30 sec let the length of bridge be x metres . then , ( 250 + x ) / 30 = 20 = > 250 + x = 600 = > x = 350 m . answer : d"
medmcqa
medmcqa_05_04059
Which of the following is not seen in subacute thyroiditis?
[ "Raised T4 levels", "Raised ESR", "Pain", "High Radio iodine uptake" ]
D
The patient usually presents with a painful and enlarged thyroid, sometimes accompanied by fever. There may be features of thyrotoxicosis or hypothyroidism, depending on the phase of the illness. The patient characteristically evolves through three distinct phases over about 6 months: Thyrotoxic phase, Hypothyroid phas...
openbookqa
obqa_02_02573
When a plant is water the liquid goes from the soil area to where it is needed using what system?
[ "xylem", "flowering pistols", "sprinkler", "leaves" ]
A
xylem carries water from the roots of a plant to the leaves of a plant
openbookqa
obqa_02_04472
Above your head, the daylight sky is gloomy and dark, despite the hour of day. The wisest thing to bring with you on this summer afternoon is
[ "a bikini", "a picnic lunch", "garden shears", "an umbrella" ]
D
grey clouds are a source of precipitation
openbookqa
obqa_02_00736
When the availability of food sources increase in an environment, what will also increase?
[ "Trash", "Bodies of Water", "Animals/Plants", "Air" ]
C
as the number of sources of food increase in an environment , the population of the organisms will increase in that environment
sciq
sciq_01_10536
In the stomach, which material's arrival triggers churning and the release of gastric juices?
[ "food", "bile", "hair", "acid" ]
A
openbookqa
obqa_02_04414
People often tear
[ "rain", "evaporation", "voltage", "private documents" ]
D
tearing means changing a whole into pieces
sciq
sciq_01_11033
What significant part of the cell do prokaryotic cells lack?
[ "a ribosome", "a cell wall", "a nucleus", "mitochondrial dna" ]
C
Prokaryotic cells are cells that lack a nucleus. The DNA in prokaryotic cells is in the cytoplasm, rather than enclosed within a nuclear membrane. All the organisms in the Bacteria and Archaea Domains have prokaryotic cells. No other organisms have this type of cell. Organisms with prokaryotic cells are called prokaryo...
openbookqa
obqa_02_02442
Which of these are required in addition to a toaster to make toast?
[ "carpet", "power plant", "television", "satellite" ]
B
a toaster converts electrical energy into heat energy for toasting
ARC-Easy
arc_04_01136
Fossils of clam shells were found in the Appalachian Mountains. Which of these statements best explains why the clam shells were found in the Appalachian Mountains?
[ "The mountain range was once under water.", "Birds flying overhead dropped the clam shells.", "Animals released the clam shells in their waste.", "The clams lived on land before moving to water." ]
A
null
sciq
sciq_01_11131
In what do a roundworm's eggs pass from host to the environment?
[ "skin", "feces", "arms", "mouth" ]
B
Some parasites live on the surface of their host. Others live inside their host. They may enter the host through a break in the skin or in food or water. For example, roundworms are parasites of mammals, including humans, cats, and dogs (see Figure below ). The worms produce huge numbers of eggs, which are passed in th...
medmcqa
medmcqa_05_04603
Class II exposure in animal bites includes the following -
[ "Scratches without oozing of blood", "Licks on a fresh wound", "Scratch with oozing ofg blood on palm", "Bites from wild animals" ]
A
Class II exposure in animal bite include nibbling if uncoveted skin minor scratches or abrasions without bleeding REF:<\p> MICROBIOLOGY ANANTHA NARAYANAN NINTH EDITION PAGE.536 table -57.1
sciq
sciq_01_01033
What is the process of the fusion of a sperm and an egg called?
[ "embryo", "stimulation", "Sperm", "fertilization" ]
D
Fertilization The fusion of a sperm and an egg is a process called fertilization. This can occur either inside ( internal fertilization) or outside ( external fertilization) the body of the female. Humans provide an example of the former, whereas frog reproduction is an example of the latter.
sciq
sciq_01_11404
In the cardiovascular system, net filtration pressure represents the interaction of osmotic pressures and what other pressures?
[ "homeostatic", "hydrostatic", "uptake", "hydrophilic" ]
B
Interaction of Hydrostatic and Osmotic Pressures The normal unit used to express pressures within the cardiovascular system is millimeters of mercury (mm Hg). When blood leaving an arteriole first enters a capillary bed, the CHP is quite high—about 35 mm Hg. Gradually, this initial CHP declines as the blood moves throu...
sciq
sciq_01_06629
The lighter photic zone and darker aphotic zone are determined by what?
[ "water density", "water depth", "water reflection", "water shape" ]
B
Two main zones based on depth of water are the photic zone and aphotic zone. The photic zone is the top 200 meters of water. The aphotic zone is water deeper than 200 meters. The deeper you go, the darker the water gets. That’s because sunlight cannot penetrate very far under water. Sunlight is needed for photosynthesi...
ARC-Easy
arc_04_00883
What is the main source of energy for the water cycle?
[ "electricity", "erosion", "gravity", "sunlight" ]
D
null
sciq
sciq_01_04370
Mass can be destroyed to release what?
[ "energy", "velocity", "acceleration", "mass" ]
A
Mass can be destroyed to release energy. • We do not ordinarily notice the increase or decrease in mass of an object because the change in mass is so small for a large increase in energy. • The relativistic work-energy theorem is W net = E − E 0 = γmc 2 − mc 2 = ⎛⎝γ − 1⎞⎠mc 2 . • Relativistically,.
medmcqa
medmcqa_05_00235
A patient presented to emergency depament with sudden onset of fever, headache, retro orbital pain, and back pain. Dengue was suspected. Which is the most sensitive diagnostic test for dengue?
[ "IgM ELISA", "CFT", "Tissue culture", "Electron microscopy" ]
A
After an incubation period of 2-7 days, the typical patient experiences the sudden onset of fever, headache, retro orbital pain, and back pain along with the severe myalgia that gave rise to the colloquial designation "break-bone fever." Laboratory findings include leukopenia, thrombocytopenia, and, in many cases, seru...
sciq
sciq_01_06837
What determines your hair color trait?
[ "genes", "cells", "chromosomes", "Heredity" ]
A
There are variations in the traits of a population. For example, there are lots of variations in the color of human hair. Hair can be blonde, brown, black, or even red. Hair color is a trait determined by genes.
openbookqa
obqa_02_02150
One day a zebra dies. Zero baby zebras were born in the herd on that day.
[ "the zebras traveled a hundred miles that day", "a new life was created", "the population went down", "the population of the herd increased" ]
C
if an organism dies then the population of that organism will decrease
sciq
sciq_01_00034
All living things need air and this to survive?
[ "water", "ecosystem", "habitat", "stimuli" ]
A
sciq
sciq_01_03512
Where is chlorine gas produced?
[ "in the nucleus", "carbon cycle", "at the anode", "epidermis" ]
C
It may be logical to assume that the electrolysis of aqueous sodium chloride, called brine , would yield the same result through the same reactions as the process in molten NaCl. However, the reduction reaction that occurs at the cathode does not produce sodium metal because the water is reduced instead. This is becaus...
medmcqa
medmcqa_05_03228
Which of the following used as skin antiseptic?
[ "Cidex", "Cresol", "Chlorhexidine", "Lysol" ]
C
Option 1 Glutaraldehyde is less toxic, less irritant and less corrosive, hence is best used to sterilize endoscopes and cystoscopes: It is used as 2% concentration (2% cidex) for 20 min. Option 2, 4 Phenolics as disinfectants: Cresol, xylenol, Lysol and oho-phenylphenol are used as disinfectants in laboratories and hos...
sciq
sciq_01_10957
What is defined as a phasic change in muscle tone?
[ "gastrointestinal", "elasticity", "susceptibility", "spasticity" ]
D
Muscle Tone Skeletal muscles are rarely completely relaxed, or flaccid. Even if a muscle is not producing movement, it is contracted a small amount to maintain its contractile proteins and produce muscle tone. The tension produced by muscle tone allows muscles to continually stabilize joints and maintain posture. Muscl...
medmcqa
medmcqa_05_04107
Which of the following dietary interventions has shown to reduces moality in patients with coronary hea disease.-
[ "High Fibre diet", "Steral Esters", "Potassium supplements", "Omega 3 polysaturated fatty acids" ]
D
Answer is D (Omega 3 Polyunsaturated Fatty Acids) Consumption of Omega 3 PUFA is associated witlt reduced total moality and sudden cardiac death in patients with ischemic hea disease A number of studies have repoed that consumption of Omega 3 fatty acids confers protection from ischaemic hea disease and that this relat...
sciq
sciq_01_02384
The light-sensing cells in the retina are called rods and what else?
[ "sensor cells", "light cells", "cones", "stents" ]
C
The back of the eye is covered by a thin layer called the retina. This is where the image of the object normally forms. The retina consists of special light-sensing cells called rods and cones. Rods sense dim light. Cones sense different colors of light.
openbookqa
obqa_02_00032
Which animal gives birth to live young?
[ "Shark", "Turtle", "Giraffe", "Spider" ]
C
mammals give birth to live young
math_qa
mathqa_03_04435
on a race track a maximum of 5 horses can race together at a time . there are a total of 25 horses . there is no way of timing the races . what is the minimum number t of races we need to conduct to get the top 3 fastest horses ?
[ "5", "7", "8", "10" ]
B
"t = 7 is the correct answer . good solution buneul . b"
sciq
sciq_01_07484
Which is the lightest of the widely used structural metals?
[ "magnesium", "calcium", "potassium", "Metal" ]
A
low, the two metals with the highest ionization energies (beryllium and magnesium) do form compounds that exhibit some covalent characters. Like the alkali metals, the heavier alkaline earth metals impart color to a flame. As in the case of the alkali metals, this is part of the emission spectrum of these elements. Cal...
openbookqa
obqa_02_02853
If a cow eats only plants, it will avoid eating
[ "hay", "roots", "thistles", "venison" ]
D
herbivores only eat plants
sciq
sciq_01_07507
What type of plants were the first to evolve?
[ "vascular", "nonvascular", "kilocalorie", "cocklebur" ]
B
Nonvascular plants were the first plants to evolve. Compared to other plants, their small size and lack of specialized structures, such as vascular tissue, stems, leaves, or flowers, explains why these plants evolved first. The first nonvascular plants to evolve were the liverworts. The hornworts evolved somewhat later...
sciq
sciq_01_00854
What is it called when one or more ending digits are dropped to get the correct number of significant figures?
[ "basing", "scientific notation", "rounding", "turning" ]
C
Rounding is done when one or more ending digits are dropped to get the correct number of significant figures. Simple rules state when to round up and when to round down.
math_qa
mathqa_03_03510
if 20 % of a is the same as 25 % of b , then a : b is :
[ "3 : 4", "4 : 3", "5 : 4", "6 : 7" ]
C
"expl : 20 % of a i = 25 % of b = 20 a / 100 = 25 b / 100 = 5 / 4 = 5 : 4 answer : c"
math_qa
mathqa_03_01995
two trains of equal length are running on parallel lines in the same directions at 46 km / hr . and 36 km / hr . the faster trains pass the slower train in 36 seconds . the length of each train is :
[ "82 m", "50 m", "72 m", "80 m" ]
B
"explanation : the relative speed of train is 46 - 36 = 10 km / hr = ( 10 x 5 ) / 18 = 25 / 9 m / s 10 × 518 = 259 m / s in 36 secs the total distance travelled is 36 x 25 / 9 = 100 m . therefore the length of each train is = 100 / 2 = 50 m . answer b"
sciq
sciq_01_01840
The process in which a sperm unites with an egg is called?
[ "fertilization", "infection", "migration", "absorption" ]
A
This image depicts a true wonder of nature. This tiny human sperm is penetrating a much larger egg. These two cells will unite to become a brand new human being. The process in which they unite is called fertilization.
ARC-Easy
arc_04_01328
Which scale is used to report the intensity of an earthquake?
[ "Saffir-Simpson Scale", "Modified Mercalli Scale", "Richter Magnitude Scale", "Moment Magnitude Scale" ]
B
null
math_qa
mathqa_03_04410
find the value of x from the below equation ? : 3 x ^ 2 - 5 x + 2 = 0
[ "2 / 3", "- 1", "0", "- 2 / 3" ]
A
"a = 3 , b = - 5 , c = 2 x 1,2 = ( 5 â ± â ˆ š ( ( - 5 ) ^ 2 - 4 ã — 3 ã — 2 ) ) / ( 2 ã — 3 ) = ( 5 â ± â ˆ š ( 25 - 24 ) ) / 6 = ( 5 â ± 1 ) / 6 x 1 = ( 5 + 1 ) / 6 = 6 / 6 = 1 x 2 = ( 5 - 1 ) / 6 = 4 / 6 = 2 / 3 a"
sciq
sciq_01_09650
What kind of tissue consists of trabeculae and forms the inner layer of all bones?
[ "corregated bone tissue", "spongy bone tissue", "denser bone tissue", "flotsam bone tissue" ]
B
Chapter 38 1 Figure 38.19B 3 Figure 38.38 In the presence of Sarin, acetycholine is not removed from the synapse, resulting in continuous stimulation of the muscle plasma membrane. At first, muscle activity is intense and uncontrolled, but the ion gradients dissipate, so electrical signals in the T-tubules are no longe...
ARC-Easy
arc_04_01488
Pollen is necessary for a flowering plant to
[ "grow.", "blossom.", "germinate.", "reproduce." ]
D
null
math_qa
mathqa_03_02620
a shoe merchant has declared a 10 % rebate in prices . how much rebate would one get if he purchases 5 pairs of shoes at rs . 28 each ?
[ "11", "12", "13", "14" ]
D
explanation : 5 shirts * rs . 28 = rs . 140 rebate = 10 % * 140 = 14 correct option : d
sciq
sciq_01_01574
The central vacuole maintains turgor pressure against what?
[ "the cell move", "the cell addition", "the cell wall", "the cell multiplication" ]
C
The central vacuole maintains turgor pressure against the cell wall.
openbookqa
obqa_02_04849
Paper suitable for recycling is often used to produce
[ "aluminum cans", "plastic bottles", "cellulose nanofibers", "glass bottles" ]
C
paper is recyclable
medmcqa
medmcqa_05_01754
Necrosis of cells is due to :
[ "Ca2+ efflux cell", "Fat deposition in cells.", "Water imbibition in cells.", "Enzymatic digestion." ]
D
• Necrosis: It refers to morphological changes that follow cell death in living tissues. • These morphological changes are the result of 2 concurrent processes. 1. Enzymatic digestion. 2. Denaturation of proteins. • The enzymes used in the process are derived from 2 sources: 1. From the lysosomes of the dead cells them...
sciq
sciq_01_09430
What describes how much matter is in a certain amount of space?
[ "viscosity", "mass", "density", "volume" ]
C
Density describes how much matter is in a certain amount of space. Substances that have more matter packed into a given space have higher densities. The water in a drinking glass has the same density as the water in a bathtub or swimming pool. All substances have characteristic densities, which does not depend on how m...
medmcqa
medmcqa_05_03931
The highest concentration of cystine can be found in?
[ "Melanin", "Chondroitin sulfate", "Myosin", "Keratin" ]
D
Keratins are a type of intermediate filament that comprises a large poion of many epithelial cells. The characteristics of skin, nails, and hair are all due to keratins. Keratins contain a large amount of the disulfide amino acid cystine. Approximately 14% of the protein composing human hair is cystine. This is the che...
sciq
sciq_01_00154
What is the rigid layer that is found outside the cell membrane and surrounds the cell?
[ "cell barrier", "cell shield", "cell root", "cell wall" ]
D
A cell wall is a rigid layer that is found outside the cell membrane and surrounds the cell. The cell wall contains not only cellulose and protein, but other polysaccharides as well. In fact, two other classes of polysaccharides, hemicelluloses and pectic polysaccharides, can comprise 30% of the dry mass of the cell wa...
medmcqa
medmcqa_05_01577
Denver shunt is used in
[ "Ascites", "Dialysis", "Raised ICT", "Raised IOP" ]
A
Denver shunt It is used for the relief of ascites due to chronic liver disease To prevent high occlusion rates as seen in Le-Veen shunt, a fuher development was the inseion of a chamber placed over the costak margin to allow digital pressure and evacuation of any debris within the peritoneovenous shunt Ref: Textbook of...
ARC-Easy
arc_04_00088
Roger poured water over a pile of sand. Some of the sand washed away. This process is similar to which of the following?
[ "The eruption of a volcano", "The erosion of the walls of a canyon", "The uplifting of mountain ranges", "The forming of dunes or mounds in a desert" ]
B
null
math_qa
mathqa_03_03406
how long does a train 165 meters long running at the rate of 36 kmph take to cross a bridge 660 meters in length ?
[ "33", "72", "55", "82.5" ]
D
"explanation : t = ( 660 + 165 ) / 36 * 18 / 5 t = 82.5 answer : option d"
medmcqa
medmcqa_05_04589
Macula involvement is common in -
[ "Toxoplasma", "Malaria", "CMV", "Syphilis" ]
A
Decreased visual acuity may occur as a result of macular involvement or severe vitreous inflammation. ... An active toxoplasmic retinochoroiditis is whitish and moderately exudative with ill-defined borders and involves the macula in a majority of patients.
sciq
sciq_01_02087
From observations as simple as blowing up a balloon, it is clear that increasing the amount of gas increases what else?
[ "area", "every volume", "the shift", "the volume" ]
D
The combined gas law, , is true for a particular sample of gas. If any gas is added or allowed to leak out, however, the relationship is lost. In order to get a relationship that is true for any sample of gas, it is necessary to incorporate a term for the amount of gas. From observations as simple as blowing up a ballo...
sciq
sciq_01_09364
What is the movement of substances across the membrane without the expenditure of cellular energy called?
[ "immune transport", "inner cell transport", "passive transport", "active transport" ]
C
membrane are nonpolar). Some examples of these are other lipids, oxygen and carbon dioxide gases, and alcohol. However, water-soluble materials—like glucose, amino acids, and electrolytes—need some assistance to cross the membrane because they are repelled by the hydrophobic tails of the phospholipid bilayer. All subst...
sciq
sciq_01_09669
Where are unsaturated fatty acids commonly found?
[ "animal products", "butter", "fish", "oil" ]
D
Unsaturated fatty acids have at least one double bond between carbon atoms. As a result, some carbon atoms are not bonded to as many hydrogen atoms as possible. They are unsaturated with hydrogens. Unsaturated fatty acids are found in oils.
openbookqa
obqa_02_02099
The earth makes its way around the sun. Because of the constant rotation, the appearance of these is unlikely to be regular.
[ "the moon", "the oceans", "celestial bodies", "the sun" ]
C
the Earth revolving around the sun causes stars to appear in different areas in the sky at different times of year
sciq
sciq_01_09352
Nonvascular plants lack vascular tissue and what?
[ "cells", "chlorophyll", "cytoplasm", "seeds" ]
D
Nonvascular plants lack seeds and vascular tissue.
medmcqa
medmcqa_05_03314
IP3/DAG pathway is activated by which of the following?
[ "Protein kinase A", "Protein kinase C", "Phospholipase C", "Phospholipase A" ]
C
ANSWER: (C) Phospholipase CREF: Guyton s physiology 12th edition page 890, KDT 6th edition page no 46See APPENDIX- 84 below "ENDOCRINE GLANDS, HORMONES, AND THEIR FUNCTIONS AND STRUCTURE"Phospholipase C catalyzes the breakdown of some phospholipids in the cell membrane, especially phosphatidylinositol biphosphate (PIP2...
medmcqa
medmcqa_05_01101
Not a branch of cervical part of Facial artery:
[ "Ascending palatine artery", "Tonsillar artery", "Submental artery", "Muscular artery" ]
D
The cervical part of the facial artery runs upwards on the superior constrictor of pharynx deep to the posterior belly of the digastric, with the stylohyoid  and to the ramus of the mandible. The cervical part of the facial artery gives off the ascending  palatine, tonsillar, submental, and glandular branches for the s...
sciq
sciq_01_00718
Glass breaking is an example of what type of change that doesn't affect the makeup of matter?
[ "thermal", "chemical", "reversible", "physical" ]
D
Physical changes are changes in the physical properties of matter but not in the makeup of matter. An example of a physical change is glass breaking.
openbookqa
obqa_02_03455
If a person enjoys star gazing the best place to live is
[ "beside a streetlight", "the countryside", "the big city", "beside a skyscraper" ]
B
as light pollution increases , seeing the stars will be harder
sciq
sciq_01_03118
What is the production of offspring without gamete fusion called?
[ "ideal reproduction", "organic reproduction", "asexual reproduction", "sexual reproduction" ]
C
sciq
sciq_01_04599
Chloroplasts, leucoplasts and chromoplasts are found in what type of cells?
[ "plant cells", "man-made cells", "animal cells", "nitrogen cells" ]
A
A third difference between plant and animal cells is that plants have several kinds of organelles called plastids . And there are several different kinds of plastids in plant cells. For example, Chloroplasts are needed for photosynthesis, leucoplasts can store starch or oil, and brightly colored chromoplasts give some ...
math_qa
mathqa_03_04260
the marks obtained by polly and sandy are in the ratio 5 : 6 and those obtained by sandy and willy are in the ratio of 9 : 7 . the marks obtained by polly and willy are in the ratio of . . . ?
[ "9 : 8", "11 : 10", "13 : 12", "15 : 14" ]
D
polly : sandy = 5 : 6 = 15 : 18 sandy : willy = 9 : 7 = 18 : 14 polly : sandy : willy = 15 : 18 : 14 polly : willy = 15 : 14 the answer is d .
sciq
sciq_01_02397
Violet and red are two types of what kind of light?
[ "infrared", "visible", "ultraviolet", "radioactive" ]
B
Figure 8.12 The colors of visible light do not carry the same amount of energy. Violet has the shortest wavelength and therefore carries the most energy, whereas red has the longest wavelength and carries the least amount of energy. (credit: modification of work by NASA).
sciq
sciq_01_10011
During summer in the northern hemisphere, the north pole is tilted toward what?
[ "horizon", "moon", "sun", "the north star" ]
C
During summer in the Northern Hemisphere, the North Pole is tilted toward the Sun. The Sun's rays strike the Northern Hemisphere more directly ( Figure below ). The region gets a lot of sunlight. Summer solstice is June 21 or 22. At that time, the Sun's rays hit directly at the Tropic of Cancer (23.5°N). This is the fa...
math_qa
mathqa_03_01294
if 6 x ^ 2 + x - 12 = ( ax + b ) ( cx + d ) , then | a | + | b | + | c | + | d |
[ "10", "12", "15", "18" ]
B
this is the hard one , definitely a 700 + level question . we need numbers a , b , c , and d such that 6 x ^ 2 + x - 12 = ( ax + b ) ( cx + d ) this means that ac = 6 , bd = – 12 , and ad + bc = 1 . the a & c pair could be ( 1 , 6 ) or ( 2 , 3 ) , in some order . the absolute values of the b & d pair could be ( 1 , 12 ...
math_qa
mathqa_03_04761
8 machines , each working at the same constant rate , together can complete a certain job in 24 days . how many additional machines , each working at the same constant rate , will be needed to complete the job in 16 days ?
[ "2", "3", "4", "6" ]
C
"another solution which is faster is since each machine works at a constant rate . the time needs to bought down from 24 to 16 . so the new time is 2 / 3 of the original time . thus to achieve this we need the rate to be 3 / 2 of original . so 3 / 2 * 8 = 12 so we need 12 - 8 = 4 more machines . answer : c"
medmcqa
medmcqa_05_02045
A child with pellagra like symptoms,amino acids in urine,family history of two siblings normal and two affected.Parents are normal.What is the diagnosis?
[ "PKU", "Alkaptonuria", "MSUD", "Hanups disease" ]
D
Hanup's disease : disease is caused by a mutation(six mutations in SLC6A19) of the gene that controls the processes of amino acid absorption and reabsorption. Symptoms: * sensitivity to light * anxiety * rapid mood swings * hallucinations * delusions * intention tremor * speech difficulties * abnormalities in muscle to...
medmcqa
medmcqa_05_01083
Which virus is implicated in Burkits lymphoma?
[ "EBV", "HTLV", "HPV", "HHV8" ]
A
(Refer: Robbins Pathologic Basis of Disease, 8thedition, pg no: 314, 607) Burkitt’s lymphoma There are three clinical types: African (endemic) Burkitt lymphoma. Sporadic (nonendemic) Burkitt lymphoma. Aggressive lymphomas associated with HIV. These 3 types are histologically identical. Immunophenotype These are tum...
openbookqa
obqa_02_04125
Sarah has one piece of wood that is smooth and polished and another that is rough and unfinished. Which of the following is true?
[ "both pieces of wood will create the same amount of friction", "the unfinished wood will generate more heat than the other while rubbed over the floor", "the rough wood will more easily move when rubbed over the tile than the finished wood.", "the finished wood will generate more heat when it is rubbed back a...
B
as the roughness of something increases , the friction of that something will increase when its surface moves against another surface
sciq
sciq_01_08261
Many carbohydrates can enter glycolysis, most often after conversion to what?
[ "fructose", "insulin", "sucrose", "glucose" ]
D
sciq
sciq_01_06366
The smallest and lightest alcohols (methanol, ethanol, propanol) are completely soluble in?
[ "oil", "argon", "gasoline", "water" ]
D
The smallest and lightest alcohols (methanol, ethanol, propanol) are completely soluble in water in all proportions. In a solution, the hydroxyl groups of alcohol molecules and the water molecules form hydrogen bonds with each other, resulting in complete miscibility. However, as the length of the carbon chain increase...
sciq
sciq_01_00457
What are the primary producers in terrestrial biomes?
[ "gases", "soil", "animals", "plants" ]
D
Plants are the primary producers in terrestrial biomes. They make food for themselves and other organisms by photosynthesis. The major plants in a given biome, in turn, help determine the types of animals and other organisms that can live there.
openbookqa
obqa_02_03886
A place without a sand bar is indicative of which of these characteristics?
[ "a flow of sedimentation to settle", "a stacking of silty sediments", "a downstream movement without sediments", "a rapid movement of sediments for downward deposit" ]
C
a sandbar is formed by water moving sediment downstream
openbookqa
obqa_02_01561
A person has a glass of water and a friend pranks them by making their water taste different. They prankster added
[ "ice", "water", "soda", "air" ]
C
dissolving a substance in water causes the water to taste like that substance
openbookqa
obqa_02_04381
With the decrease in size of Antarctica Fiji will soon be
[ "gone", "better for fishing", "richer", "colder" ]
A
as the level of water rises , the amount of available land will decrease