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Biology · CELL THE UNIT OF LIFE

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Consider the following statements regarding prokaryotic cell envelope and its modifications: (A) The cell envelope consists of a tightly bound three-layered structure: glycocalyx, cell wall, and plasma membrane. (B) The cell wall prevents the bacterium from bursting or collapsing. (C) Mesosomes are present in the form of vesicles, tubules, and lamellae. (D) Chromatophores are membranous extensions in cyanobacteria that contain pigments. Which of the above statements are correct?

  1. (A) and (B) only
  2. (B) and (C) only
  3. (A), (C) and (D) only
  4. (A), (B), (C) and (D)

Correct answer · Option 4

(A), (B), (C) and (D)

Explanation

All four statements (A, B, C, and D) are completely accurate descriptions of the bacterial cell envelope, mesosomes, and chromatophores.

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