Lecture 16 Niacin (B3) - MC

Question 1

Niacin was originally discovered due to its association with which medical condition?
A) Scurvy
B) Beriberi
C) Pellagra
D) Rickets

Answer 1

C

Question 2

*What happens when a hydroxyl group in niacin is substituted with an amino group?
A) It becomes nicotinamide.
B) It transforms into nicotinic acid.
C) It is converted to NADH.
D) It changes into NADP.

Answer 2

B

Question 3

*What are NADH and NADPH primarily important for in the human body?
A) Stimulating muscle growth.
B) Biosynthetic reactions, such as making fats and carbohydrates.
C) Regulating sodium and potassium levels.
D) Promoting the synthesis of proteins.

Answer 3

B

Question 4

How is niacin typically found in animal foods?
A) As nicotinic acid.
B) As nicotinamide.
C) Mainly as NAD and NADP.
D) As a free amino acid.

Answer 4

C

Question 5

In which form does niacin primarily occur in plant foods?
A) As NAD and NADP.
B) As nicotinic acid.
C) As nicotinamide.
D) In its elemental form.

Answer 5

B

Question 6

*How stable is niacin in foods?
A) It is highly unstable and degrades quickly.
B) It is moderately stable with some loss during cooking.
C) It is fairly stable with minimal losses from cooking or storage.
D) It is completely unstable and lost during cooking.

Answer 6

C

Question 7

What are the primary functions of niacin in the body?
A) Assists in the metabolism of proteins and nucleic acids.
B) Enhances oxygen transport and red blood cell production.
C) Assists in the metabolism of carbohydrates and fatty acids for energy production.
D) Promotes calcium absorption and bone health.

Answer 7

C