VITAMINS AND COENZYMES QUIZ

Lipoic acid is a co-factor of the

di-hydroorotate dehydrogenase

both (a) and (b)

pyruvic dehydrogenase

α-ketoglutaric dehydrogenase

TRUE ANSWER : ?
YOUR ANSWER : ?

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

form chelation

stabilize the semiquinone

de-stabilize the semiquinone

all of these

TRUE ANSWER : ?
YOUR ANSWER : ?

A fat-soluble vitamin that regulates blood clotting is

vitamin A

vitamin C

vitamin K

niacin

TRUE ANSWER : ?
YOUR ANSWER : ?

An example of a digestive hormone is

lipase

gastrin

pepsin

amylase

TRUE ANSWER : ?
YOUR ANSWER : ?

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

All of these

Pyridoxal

Pyridoxine

Pyridoxamine

TRUE ANSWER : ?
YOUR ANSWER : ?

The disease Beriberi is due to a dietary deficiency in

vitamin B12

vitamin B2 (riboflavin)

vitamin B6 (pyridoxine)

vitamin B1 (thiamine)

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.

adenine

hydroxycobalamin

5-6 dimethylbenzimidazole

cyanocobalamin

TRUE ANSWER : ?
YOUR ANSWER : ?

β-carotene together with α-carotene, γ-carotene and cryptoxanthine are synthesized by

none of these

animal

plants and animals both

plants

TRUE ANSWER : ?
YOUR ANSWER : ?

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

all of these

reducing agent

antioxidants

oxidizing agent

TRUE ANSWER : ?
YOUR ANSWER : ?

The vitamin riboflavin, which occurs as a yellow pigment in egg yolk and milk become

more deep in color on oxidation and regained its color on reduction with Zn in acid

colorless on oxidation and regained its color on reduction with Zn in acid

colorless on reduction with Zn in acid and regained its color on re-oxidation

more deep in color on reduction with Zn in acid and regained its color on re-oxidation

TRUE ANSWER : ?
YOUR ANSWER : ?