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neet BIOLOGYMedium

Which one of the following statements is correct?

A

The daily requirement of Mg and Ca in the human body is estimated to be 0.2-0.3 g

B

All enzymes that utilise ATP in phosphate transfer require Ca as the cofactor

C

The bone in human body is an inert and unchanging substance

D

Mg plays roles in neuromuscular function and interneuronal transmission

Step-by-Step Solution

The daily requirement of calcium and magnesium for an adult is approximately 0.2-0.3 g. Bones are dynamic tissues, not inert. Mg is essential for many enzymes, but ATP-utilizing enzymes often require Mg2+Mg^{2+} as a cofactor, not Ca2+Ca^{2+}.

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