VITAMINS AND COENZYMES QUIZ

Which of these is a symptom of vitamin A deficiency?

Impaired blood clotting

Blindness

Osteoporosis

Impaired taste perception

TRUE ANSWER : ?
YOUR ANSWER : ?

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

all of these

antioxidants

reducing agent

oxidizing agent

TRUE ANSWER : ?
YOUR ANSWER : ?

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

heme-protein

both (a) and (b)

nonheme type

flavin moiety

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of these is a vitamin A precursor?

Cobalamin

Thiamine

Beta-Carotene

Pyridoxine

TRUE ANSWER : ?
YOUR ANSWER : ?

A fat-soluble vitamin that regulates blood clotting is

niacin

vitamin C

vitamin K

vitamin A

TRUE ANSWER : ?
YOUR ANSWER : ?

An early sign of retinol deficiencies in man is

keratinization

xeropthalmia

none of these

night blindness

TRUE ANSWER : ?
YOUR ANSWER : ?

Vitamin K1 was first isolated from alfalalfa and has the phytyl side chain consisting of

six isoprene units

four isoprene units

nine isoprene units

four isoprene units

TRUE ANSWER : ?
YOUR ANSWER : ?

What metal ion is specifically bound by vitamin B12?

Zinc

Cobalt

Copper

Iron

TRUE ANSWER : ?
YOUR ANSWER : ?

The occurrence of metals such as iron or molybdenum in some flavoproteins can

stabilize the semiquinone

all of these

de-stabilize the semiquinone

form chelation

TRUE ANSWER : ?
YOUR ANSWER : ?

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