VITAMINS AND COENZYMES QUIZ

The vitamin niacin is part of the __________ molecule.

pyrophosphate

pyridoxal phosphate

ferredoxin

NAD+

TRUE ANSWER : ?
YOUR ANSWER : ?

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

nonheme type

both (a) and (b)

heme-protein

flavin moiety

TRUE ANSWER : ?
YOUR ANSWER : ?

Biotin occurs mainly in combined forms bound to protein through

ε-S-lysine moiety

ε-N-biotinyl-L-lysine

ε-N-lipoyl - L-lysine

ε-N-lysine moiety

TRUE ANSWER : ?
YOUR ANSWER : ?

An early sign of retinol deficiencies in man is

night blindness

xeropthalmia

keratinization

none of these

TRUE ANSWER : ?
YOUR ANSWER : ?

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

both ends by one disulfide bond

both ends by two disulfide bonds

either end via a single disulfide bond

either end via two disulfide bonds

TRUE ANSWER : ?
YOUR ANSWER : ?

Selenium is an essential component of the enzyme glutathione peroxidase which

oxidizes toxic hydoperoxycompounds in tissues

reduces toxic hydoperoxycompounds in tissues

None of these

scavenges toxic hydoperoxycompounds in tissues

TRUE ANSWER : ?
YOUR ANSWER : ?

Ascorbic acid acts as an

oxidizing and reducing agent both

reducing agent

oxidizing agent

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

The disease Beriberi is due to a dietary deficiency in

vitamin B12

vitamin B6 (pyridoxine)

vitamin B1 (thiamine)

vitamin B2 (riboflavin)

TRUE ANSWER : ?
YOUR ANSWER : ?

Vitamin-C is considered as a

none of these

fat soluble

fat and water soluble

water soluble

TRUE ANSWER : ?
YOUR ANSWER : ?

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

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

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 oxidation and regained its color on reduction with Zn in acid

TRUE ANSWER : ?
YOUR ANSWER : ?