Cell Theory and the Basic Unit of Life · NCERT Biology

The smallest cell, measuring only 0.3 micrometers in length, is:

  1. Bacteria
  2. Mycoplasma cells
  3. Ostrich egg cell
  4. Human red blood cell
Show answer and explanation

Correct answer: Mycoplasma cells

Mycoplasmas are the smallest known living cells. They lack a cell wall and can survive without oxygen, reaching sizes as small as 0.3 micrometers.

Difficulty: Medium Question 7 of 20

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