VITAMINS AND COENZYMES QUIZ

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

nine isoprene units

four isoprene units

six isoprene units

four isoprene units

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of these molecules is vitamin H?

Folic acid

Biotin

Carnitine

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Lipoic acid exists in

none of these

oxidized and reduced form both

oxidized form

reduced form

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following are reduced coenzymes?

NADH and FADH2

Coenzyme A and ubiquinone

NAD+ and FAD

ATP and GTP

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 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

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

TRUE ANSWER : ?
YOUR ANSWER : ?

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

all of these

de-stabilize the semiquinone

stabilize the semiquinone

form chelation

TRUE ANSWER : ?
YOUR ANSWER : ?

E.coli ACP has its molecular weight as around

9000

90,000

19000

39000

TRUE ANSWER : ?
YOUR ANSWER : ?

Ascorbic acid acts as an

oxidizing and reducing agent both

reducing agent

None of these

oxidizing agent

TRUE ANSWER : ?
YOUR ANSWER : ?

A deficiency of thiamin produces the disease known as

scurvy

anemia

cataract

beri-beri

TRUE ANSWER : ?
YOUR ANSWER : ?

A fat-soluble vitamin that regulates blood clotting is

vitamin A

niacin

vitamin C

vitamin K

TRUE ANSWER : ?
YOUR ANSWER : ?