What vitamin is essential for normal synthesis of prothrombin group proteins, thus enabling them to bind Ca2+?
a. Vitamin K
b. Vitamin B12
c. Vitamin C
d. Vitamin D
ANS: A
Vitamin K is necessary for carboxylation of glutamic acid residues on the precursor prothrombin group proteins. This carboxylation results in the ability of these proteins to bind Ca2+.
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