VITAMINS AND COENZYMES QUIZ

Which of these hormones is a catecholamine?

Tetraiodothyronine

Follitropin

Tetrahydrofolate

Norepinephrine

TRUE ANSWER : ?
YOUR ANSWER : ?

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

none of these

plants and animals both

plants

animal

TRUE ANSWER : ?
YOUR ANSWER : ?

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

antioxidants

reducing agent

oxidizing agent

all of these

TRUE ANSWER : ?
YOUR ANSWER : ?

The disease Beriberi is due to a dietary deficiency in

vitamin B2 (riboflavin)

vitamin B6 (pyridoxine)

vitamin B1 (thiamine)

vitamin B12

TRUE ANSWER : ?
YOUR ANSWER : ?

The absence of ascorbic acid in the human diet gives rise to

beri-beri

pernicious anemia

rickets

cataract

TRUE ANSWER : ?
YOUR ANSWER : ?

Ascorbic acid acts as an

oxidizing agent

reducing agent

None of these

oxidizing and reducing agent both

TRUE ANSWER : ?
YOUR ANSWER : ?

Lipoic acid is a co-factor of the

α-ketoglutaric dehydrogenase

pyruvic dehydrogenase

both (a) and (b)

di-hydroorotate dehydrogenase

TRUE ANSWER : ?
YOUR ANSWER : ?

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

all of these

form chelation

stabilize the semiquinone

de-stabilize the semiquinone

TRUE ANSWER : ?
YOUR ANSWER : ?

What metal ion is specifically bound by vitamin B12?

Iron

Zinc

Copper

Cobalt

TRUE ANSWER : ?
YOUR ANSWER : ?

Biotin occurs mainly in combined forms bound to protein through

ε-N-lipoyl - L-lysine

ε-S-lysine moiety

ε-N-biotinyl-L-lysine

ε-N-lysine moiety

TRUE ANSWER : ?
YOUR ANSWER : ?

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