VITAMINS AND COENZYMES QUIZ

Vitamin B12 is useful in the prevention and treatment of

cataract

scurvy

pernicious anemia

beri-beri

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following compounds/(s) belong/(s) to the vitamin B6 group?

Pyridoxine

All of these

Pyridoxal

Pyridoxamine

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(Co+)to B12(Co2+)

B12(Co2+)to B12(Co+)

B12(Co) to B12(Co2+)

B12(Co2+)to B12(Co)

TRUE ANSWER : ?
YOUR ANSWER : ?

An early sign of retinol deficiencies in man is

xeropthalmia

keratinization

none of these

night blindness

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following are reduced coenzymes?

Coenzyme A and ubiquinone

NADH and FADH2

ATP and GTP

NAD+ and FAD

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of these molecules is vitamin H?

Carnitine

Biotin

None of these

Folic acid

TRUE ANSWER : ?
YOUR ANSWER : ?

Vitamins are essential because the organism

can't synthesize these compounds at all

can synthesize these compounds partially

can't synthesize these compounds in the adequate amounts

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

An enzyme, L-folate reductase reduces folic acid to

trihydrofolic acid

tetrahydrofolic acid

hydrofolic acid

dihydrofolic acid

TRUE ANSWER : ?
YOUR ANSWER : ?

What metal ion is specifically bound by vitamin B12?

Iron

Zinc

Copper

Cobalt

TRUE ANSWER : ?
YOUR ANSWER : ?

Selenium is an essential component of the enzyme glutathione peroxidase which

None of these

reduces toxic hydoperoxycompounds in tissues

scavenges toxic hydoperoxycompounds in tissues

oxidizes toxic hydoperoxycompounds in tissues

TRUE ANSWER : ?
YOUR ANSWER : ?

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