Multiple choice

Determine the correctness or otherwise of the following Assertion (a) and the Reason (r) Assertion: In synchronous culture, majority of the cells move to next phase of the cell cycle simultaneously. Reason: Synchronous culture could be obtained by starving cells for essential nutrient components.

  1. both (a) and (r) are true and (r) is the correct reason for (a)

  2. both (a) and (r) are true but (r) is not the correct reason for (a)

  3. (a) is true but (r) is false

  4. (a) is false but (r) is true
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A Correct answer
Explanation

Synchronous cultures are indeed characterized by cells moving through the cell cycle phases simultaneously, which is the definition of synchrony. Starving cells for essential nutrients is a valid method to obtain synchronous culture - when nutrients are restored, all cells resume division at the same time. Therefore, the reason correctly explains why the assertion is true.

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