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NDA 1 2024 GAT, question 77

Topic: Biology

Q77

Which of the following statements regarding animal cell membrane is correct ?

  1. (a) They are composed of phospholipids only.
  2. (b) They are composed of proteins only.
  3. (c) They are composed of phospholipids and proteins only.
  4. (d) They are composed of phospholipids, proteins and cholesterol (lipid).Correct answer

Solution.

Answer: (d) They are composed of phospholipids, proteins and cholesterol (lipid).

  1. An animal cell membrane is a phospholipid bilayer with proteins in it.
  2. Cholesterol sits between the phospholipids and controls how fluid the membrane is.
  3. So (d), with all three, is the most complete option.

Trap: Membranes also carry some carbohydrates, which no option mentions; (d) is still the fullest list given.