Which of the following statements regarding animal cell membrane is <strong>CORRECT</strong>?

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

Explanation

Animal cell membranes are fluid mosaics composed primarily of a phospholipid bilayer, embedded proteins, and cholesterol which helps regulate membrane fluidity.

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