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MDCAT Question Bank

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1009 available questions

Biology · Question 781

Ribosomes attached to the same mRNA molecule are collectively called:

  1. lysosome
  2. nucleosome
  3. polysome
  4. polosome
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Correct answer: C

polysome

The correct choice is polysome.

Biology · Question 782

The upward movement of water and minerals through xylem is called:

  1. ascent of sap
  2. plasmolysis
  3. deplasmolysis
  4. guttation
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Correct answer: A

ascent of sap

The correct choice is ascent of sap.

Biology · Question 783

The reaction centre of photosystem II absorbs light most strongly at:

  1. 680nm
  2. 100 nm
  3. 700 nm
  4. 670nm
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Correct answer: A

680nm

The correct choice is 680nm.

Biology · Question 784

In which part of a chloroplast is carbon dioxide fixed to make sugar?

  1. Stroma
  2. Grana
  3. Thylakoid
  4. Outer membrane
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Correct answer: A

Stroma

The correct choice is Stroma.

Biology · Question 785

Darwin commonly described evolution by natural selection as:

  1. Punctuated equilibrium
  2. Survival of the fittest
  3. Inheritance of acquired characteristics
  4. Descent with modification
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Correct answer: D

Descent with modification

The correct choice is Descent with modification.

Biology · Question 786

The trachea is also called the:

  1. bronchi
  2. bronchioles
  3. Windpipe
  4. alveolar duct
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Correct answer: C

Windpipe

The correct choice is Windpipe.

Biology · Question 787

What is the main function of the prokaryotic cell wall?

  1. Give rigidity
  2. Give a specific shape
  3. Protect against osmotic lysis
  4. All of these
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Correct answer: D

All of these

The correct choice is All of these.

Biology · Question 788

Which cells provide nourishment to a developing egg in an ovarian follicle?

  1. germ cells
  2. milk cells
  3. follicle cells
  4. all of these
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Correct answer: C

follicle cells

The correct choice is follicle cells.

Biology · Question 789

A deficiency of vasopressin causes:

  1. Acromegaly
  2. Diabetes mellitus
  3. Dwarfism
  4. Diabetes insipidus
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Correct answer: D

Diabetes insipidus

The correct choice is Diabetes insipidus.

Biology · Question 790

Which enzyme-action model was proposed by Koshland in 1959?

  1. Unit membrane model
  2. Fluid mosaic model
  3. Reflective index model
  4. Induced fit model
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Correct answer: D

Induced fit model

The correct choice is Induced fit model.