Vitamin-B2.

Question 1

Another name of vitamin-B2?

Answer 1

Riboflavin.

Question 2

Which B complex was the first to be isolated in free state?

Answer 2

Riboflavin.

Question 3

Chemical structure of vitamin B2?

Answer 3

Dimethyl isoalloxazine ring connected to ribitol( alcohol of ribose sugar)

Question 4

Riboflavin is heat stable. True or False?

Answer 4

True.

Question 5

Which two coenzymes convert riboflavin to its active form?

Answer 5

FMN( flavin mononucleotide).

FAD( flavin adenine dinucleotides).

Question 6

Enzyme containing riboflavin are called?

Answer 6

Flavoproteins.

Question 7

Riboflavin converted to FMN by ? then FMN to FAD by ?

Answer 7

1) flavokinase.

2) FAD synthase.

Question 8

Source of riboflavin?

Answer 8

Intestinal flora.

Question 9

Which complex of ETC contains FMN?

Answer 9

NADH dehydrogenase.

Question 10

Requirement of riboflavin is related to metabolism of which vital element?

Answer 10

Carbohydrates.

Question 11

Major manifestations are seen on of riboflavin deficiency?

Answer 11

Skin and mucous membranes.

Question 12

Symptoms?

Answer 12

1) Glossitis.
2) Magenta coloured tongue.
3) Cheilosis.( lips).
4) Angular stomatitis ( inflammation at corners of mouth).

Question 13

Name FAD dependent enzymes?

Answer 13

1) Succinate to Fumurate by succinate DH.
2) Acyl Co-A to alpha beta unsaturated acyl Co-A by acyl Co-A DH.
3) Xanthine to Uric acid by xanthine oxidase.
4) pyruvate to acetyl Co-A by pyruvate DH.
5) Alpha KG to succinyl Co-A by alpha KG DH.