VITAMINS AND COENZYMES QUIZ

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

B12(Co2+)to B12(Co)

B12(Co2+)to B12(Co+)

B12(Co+)to B12(Co2+)

B12(Co) to B12(Co2+)

TRUE ANSWER : ?
YOUR ANSWER : ?

The most prominent role that tocopherol has in in-vitro systems is as a strong

oxidizing agent

all of these

antioxidants

reducing agent

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of these is a vitamin A precursor?

Cobalamin

Thiamine

Pyridoxine

Beta-Carotene

TRUE ANSWER : ?
YOUR ANSWER : ?

Lipoic acid exists in

none of these

oxidized form

oxidized and reduced form both

reduced form

TRUE ANSWER : ?
YOUR ANSWER : ?

Ascorbic acid acts as an

oxidizing and reducing agent both

oxidizing agent

None of these

reducing agent

TRUE ANSWER : ?
YOUR ANSWER : ?

In the co-enzyme B12the position occupied by a cyanide ion in vitamin B12 is bonded directly to the __________ of the ribose of adenosine.

5-6 dimethylbenzimidazole

cyanocobalamin

adenine

hydroxycobalamin

TRUE ANSWER : ?
YOUR ANSWER : ?

Main function of insulin hormone is to

decrease glycogen in liver

increase glycogen in liver

increase blood sugar

decrease blood sugar

TRUE ANSWER : ?
YOUR ANSWER : ?

In one iron-metalloflavoprotein, the iron is present as a

flavin moiety

nonheme type

heme-protein

both (a) and (b)

TRUE ANSWER : ?
YOUR ANSWER : ?

A deficiency of Vitamin K results in a decreased level of

prothrombin

fibrin

thrombin

fibrinogen

TRUE ANSWER : ?
YOUR ANSWER : ?

A deficiency of thiamin produces the disease known as

cataract

beri-beri

anemia

scurvy

TRUE ANSWER : ?
YOUR ANSWER : ?

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