VITAMINS AND COENZYMES QUIZ

Lipoic acid is a co-factor of the

both (a) and (b)

di-hydroorotate dehydrogenase

α-ketoglutaric dehydrogenase

pyruvic dehydrogenase

TRUE ANSWER : ?
YOUR ANSWER : ?

What metal ion is specifically bound by vitamin B12?

Iron

Cobalt

Zinc

Copper

TRUE ANSWER : ?
YOUR ANSWER : ?

An early sign of retinol deficiencies in man is

keratinization

xeropthalmia

none of these

night blindness

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of these is a vitamin A precursor?

Pyridoxine

Beta-Carotene

Thiamine

Cobalamin

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of these is a symptom of vitamin A deficiency?

Osteoporosis

Impaired blood clotting

Blindness

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 : ?

Ascorbic acid acts as an

oxidizing and reducing agent both

None of these

oxidizing agent

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

hydroxycobalamin

cyanocobalamin

adenine

TRUE ANSWER : ?
YOUR ANSWER : ?

An example of a digestive hormone is

pepsin

lipase

gastrin

amylase

TRUE ANSWER : ?
YOUR ANSWER : ?

Models of end-linked Osaka VI Fibrinogen dimers, a bilayer dimer is linked at

both ends by two disulfide bonds

either end via two disulfide bonds

both ends by one disulfide bond

either end via a single disulfide bond

TRUE ANSWER : ?
YOUR ANSWER : ?

↑