Enzyme freezing, in contrast to the action of high temperatures, does not lead to a loss of enzyme activity under normal

Enzyme freezing, in contrast to the action of high temperatures, does not lead to a loss of enzyme activity under normal conditions. What is the reason for this?

1) enzymes are proteins, so heating leads to their irreversible denaturation and loss of activity;
2) low temperatures cause reversible denaturation of proteins, and under normal conditions they restore their structure and activity.

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