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11. Lipoic acid exists in

A. oxidized form
B. reduced form
C. oxidized and reduced form both
D. none of these

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12. Vitamin B₁₂ is useful in the prevention and treatment of

A. pernicious anemia
B. scurvy
C. cataract
D. beri-beri

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13. An example of a digestive hormone is

A. lipase
B. pepsin
C. amylase
D. gastrin

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14. In the co-enzyme B12 the position occupied by a cyanide ion in vitamin B12 is bonded directly to the __________ of the ribose of adenosine.

A. adenine
B. 5-6 dimethylbenzimidazole
C. hydroxycobalamin
D. cyanocobalamin

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15. The reductant, NADH, transfers the electrons via a flavo-proteins to the specific disulfide (S-S) protein to form a dithiol (SH,SH) protein which converts vitamin

A. B₁₂(Co²⁺)to B₁₂(Co)
B. B₁₂(Co) to B₁₂(Co²⁺)
C. B₁₂(Co²⁺)to B₁₂(Co⁺)
D. B₁₂(Co⁺)to B₁₂(Co²⁺)

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