After refrigeration, which LD isoenzymes remain active?

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Multiple Choice

After refrigeration, which LD isoenzymes remain active?

Explanation:
LDH exists as five isoenzymes formed by different H and M subunit combinations, and they don’t all behave the same when kept cold. Those with more M-subunits are more resistant to cold-induced inactivation. LD4 and LD5, which have higher M-subunit content, stay active longer at 4°C, while the other isoenzymes tend to lose activity more quickly. So after refrigeration, the isoenzymes that remain active are the ones with the greater M-subunit composition, namely LD4 and LD5.

LDH exists as five isoenzymes formed by different H and M subunit combinations, and they don’t all behave the same when kept cold. Those with more M-subunits are more resistant to cold-induced inactivation. LD4 and LD5, which have higher M-subunit content, stay active longer at 4°C, while the other isoenzymes tend to lose activity more quickly. So after refrigeration, the isoenzymes that remain active are the ones with the greater M-subunit composition, namely LD4 and LD5.

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