Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
Consider the following statements: (1) Copper is present in cytochrome oxidane (2) Pantothenic acid is the precursor of co-enzyme-A (3) Thiamine pyprophosphate is the prosthetic group in decarboxylases (4) Zinc is present in RNA and DNA polymerasesA) 1, 2 and 3 are correct
B) 1 and 2 are correct
C) 1, 2 and 4 are correct
D) 1 and 3 are correct
Correct Answer: B
Solution :
Cytochrome oxidase contains two copper ion (CuA and CuB) and two heme-A groups (heme a and heme-\[{{a}_{3}}\]). Pantothenic acid is the precursor of coenzyme-A. The coenzyme-A is a universal carrier of acyi groups. Thiamine Thyophosphatc (TTP) is the prosthetic group of three important enzymes pyruvate dehydrogenase, a-ketoglutarate and ransketolase. \[M{{g}^{2+}}\]is present in RNA and DNA polymerases. Zinc is present in various enzymes such as alcohol dehydrogenase, carbonic anhydrase. carboxypeptidase, in glucocorticoid and receptors and in zinc Finger proteins.
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