VITAMINS AND COENZYMES QUIZ

Ascorbic acid acts as an

None of these

oxidizing and reducing agent both

oxidizing agent

reducing agent

TRUE ANSWER : ?
YOUR ANSWER : ?

The disease Beriberi is due to a dietary deficiency in

vitamin B6 (pyridoxine)

vitamin B12

vitamin B2 (riboflavin)

vitamin B1 (thiamine)

TRUE ANSWER : ?
YOUR ANSWER : ?

A deficiency of niacin causes

anemia

cataract

scurvy

pellagra

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Pyridoxamine

All of these

Pyridoxal

Pyridoxine

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

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

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

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

TRUE ANSWER : ?
YOUR ANSWER : ?

Selenium is an essential component of the enzyme glutathione peroxidase which

scavenges toxic hydoperoxycompounds in tissues

reduces toxic hydoperoxycompounds in tissues

oxidizes toxic hydoperoxycompounds in tissues

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

A deficiency of Vitamin K results in a decreased level of

fibrin

thrombin

fibrinogen

prothrombin

TRUE ANSWER : ?
YOUR ANSWER : ?

What metal ion is specifically bound by vitamin B12?

Zinc

Iron

Copper

Cobalt

TRUE ANSWER : ?
YOUR ANSWER : ?

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

six isoprene units

nine isoprene units

four isoprene units

TRUE ANSWER : ?
YOUR ANSWER : ?

An early sign of retinol deficiencies in man is

keratinization

night blindness

none of these

xeropthalmia

TRUE ANSWER : ?
YOUR ANSWER : ?