The rate limiting step in the formation of 1,25 dihydroxy Vitamin D 3 (the active form of the vitamin) is:

Question

The rate limiting step in the formation of 1,25 dihydroxy Vitamin D 3  (the active form of the vitamin) is:

Accepted Answer

the addition of a hydroxyl group in the kidney

Answer

the addition of a hydroxyl group in the liver

Answer

plasma calcitonin levels

Answer

the absorption of precursor (Vitamin D 3 ) from the gastrointestinal tract

Answer

the formation of Vitamin D 3   in the skin caused by exposure to UV light

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