How many LDH isoenzymes exist?

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Multiple Choice

How many LDH isoenzymes exist?

Explanation:
LDH isoenzymes in humans are determined by the way four subunits come together. There are two subunit types, heart (H) and muscle (M), and the enzyme forms a tetramer. With four subunits and each subunit being either H or M, there are five distinct tetramer combinations: HHHH, HHHM, HHMM, HMMM, and MMMM. These five combinations correspond to LDH-1 through LDH-5, so the total number of LDH isoenzymes is five.

LDH isoenzymes in humans are determined by the way four subunits come together. There are two subunit types, heart (H) and muscle (M), and the enzyme forms a tetramer. With four subunits and each subunit being either H or M, there are five distinct tetramer combinations: HHHH, HHHM, HHMM, HMMM, and MMMM. These five combinations correspond to LDH-1 through LDH-5, so the total number of LDH isoenzymes is five.

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