VITAMINS AND COENZYMES QUIZ

An early sign of retinol deficiencies in man is

xeropthalmia

none of these

keratinization

night blindness

TRUE ANSWER : ?
YOUR ANSWER : ?

Lipoic acid is a co-factor of the

pyruvic dehydrogenase

α-ketoglutaric dehydrogenase

both (a) and (b)

di-hydroorotate dehydrogenase

TRUE ANSWER : ?
YOUR ANSWER : ?

Vitamin B12 is useful in the prevention and treatment of

beri-beri

cataract

scurvy

pernicious anemia

TRUE ANSWER : ?
YOUR ANSWER : ?

The vitamin niacin is part of the __________ molecule.

ferredoxin

NAD+

pyrophosphate

pyridoxal phosphate

TRUE ANSWER : ?
YOUR ANSWER : ?

Dihydroorotate dehydrogenase contains

2 flavins and 4 atoms of iron per molecule

4 flavins and 4 atoms of iron per molecule

4 flavins and 2 atoms of iron per molecule

2 flavins and 2 atoms of iron per molecule

TRUE ANSWER : ?
YOUR ANSWER : ?

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

de-stabilize the semiquinone

form chelation

stabilize the semiquinone

all of these

TRUE ANSWER : ?
YOUR ANSWER : ?

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

either end via two disulfide bonds

both ends by two disulfide bonds

both ends by one disulfide bond

either end via a single disulfide bond

TRUE ANSWER : ?
YOUR ANSWER : ?

Acyl carrier protein (ACP) plays an important role in the biosynthesis of

amino acids

carbohydrates

sugars

fatty acids

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-lysine moiety

ε-N-lipoyl - L-lysine

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of these is a vitamin A precursor?

Thiamine

Pyridoxine

Cobalamin

Beta-Carotene

TRUE ANSWER : ?
YOUR ANSWER : ?

↑