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Question 74

A student claims that a mature mammalian red blood cell needs a large nucleus to maximize its oxygen-carrying capacity. Which correction is accurate?

  1. It keeps two nuclei to control gas exchange.
  2. It replaces the nucleus with a cell wall.
  3. It enlarges its nucleus before entering blood.
  4. It lacks a nucleus when mature.Correct answer

Explanation

A mature mammalian red blood cell has no nucleus, which leaves more internal room for oxygen-binding pigment. Retaining a large nucleus would occupy space rather than increase the amount of that pigment the cell can contain.

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