Use the MDCAT Question Bank to study by subject and try each question yourself. Click Show Answer to check the correct choice, then take a practice test when you’re ready.
Biology · Question 271
Which of the following would most greatly increase the activity of an enzyme functioning in the small intestine?
Decrease the temperature
Increase the amount o enzymes
Decrease the PH
Increase the amount of substrate
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Correct answer: D
Increase the amount of substrate
Biology · Question 272
What is the attractive force between water molecules and the wall of a container called?
Cohesion
Adhesion
Surface tension
Capillarity
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Correct answer: B
Adhesion
Adhesion is attraction between unlike substances, such as water molecules and a container surface. Cohesion is attraction between water molecules.
Biology · Question 273
A homozygous white-eyed female Drosophila is crossed with a red-eyed male. What percentage of their male offspring will have white eyes?
0%
25%
50%
100%
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Correct answer: D
100%
Every son receives the Y chromosome from the father and a white-eye allele on the X chromosome from the homozygous white-eyed mother. Therefore, all male offspring will be white-eyed.
Biology · Question 274
The raw material for coenzymes are?
Proteins
vitamins
lipids
both a and b
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Correct answer: B
vitamins
Biology · Question 275
In a typical menstrual cycle of 28 days, what is the most likely fertile period?
Days 5 to 10
Days 1 to 5
Days 14 to 15
Days 11 to 14
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Correct answer: D
Days 11 to 14
Biology · Question 276
These animals have only left aortic arch in their circulatory system.
Crocodiles and mammals
Birds and mammals
Mammals only
All of the above
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Correct answer: C
Mammals only
Biology · Question 277
All of the following are the characteristics of cartilage except:
t is a type of connective tissue
The precursor cells are chondrocytes
it contains blood vessels
it heals very slowly
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Correct answer: C
it contains blood vessels
Biology · Question 278
The hind brain is comprised of all of the following except:
Pons
Cerebellum
Cerebrum
Medulla oblongata
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Correct answer: C
Cerebrum
Biology · Question 279
The organism able to use sunlight directly as a source of energy are?