Discussion
Assertion (A): Cells are frozen slowly but thawed quickly.
Reason (R): Slow cooling limits intracellular ice formation, and quick thawing limits crystal growth.
Answer: D
Both are true and the reason gives the rationale for each half: the danger at both stages is ice, and the two rates are chosen to give it as little opportunity as possible to form or grow. Ice, not cold, is what actually destroys a frozen cell.
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