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Biology · CELL THE UNIT OF LIFE

हिन्दी

A eukaryotic cilium axoneme has a \( 9+2 \) arrangement of microtubules, whereas a centriole shows a \( 9+0 \) cartwheel arrangement. How many individual protofilament-forming microtubules constitute the peripheral fibrils in a single cilium axoneme and a single centriole barrel, respectively?

  1. 18 and 27
  2. 9 and 9
  3. 20 and 27
  4. 18 and 9

Correct answer · Option 1

18 and 27

Explanation

Peripheral fibrils in cilium axoneme consist of 9 doublets: \( 9 \times 2 = 18 \) microtubules. Centriole peripheral fibrils consist of 9 triplets: \( 9 \times 3 = 27 \) microtubules.
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