Lecture 15 Vitamin C - MC

Question 1

Vitamin C is a generic descriptor for compounds with similar biological activity to which substance?
A) Ascorbic acid
B) Dehydroascorbic acid
C) Gluconolactone
D) Glucose

Answer 1

A

Question 2

Why can’t humans synthesize Vitamin C?
A) Lack of the enzyme gluconolactone oxidase.
B) Inability to absorb sufficient glucose.
C) Absence of dietary glucose.
D) Overabundance of dehydroascorbic acid in the body.

Answer 2

A

Question 3

In which form is Vitamin C most commonly found in foods?
A) Ascorbic acid
B) Dehydroascorbic acid
C) Both ascorbic acid and dehydroascorbic acid equally
D) Neither form

Answer 3

C

Question 4

*How does the body’s absorption rate of Vitamin C change with intake levels?
A) Increases as intake increases.
B) Remains constant regardless of intake.
C) Decreases when intake is excessively high.
D) Decreases as intake decreases.

Answer 4

C

Question 5

Which disease is traditionally associated with a deficiency in Vitamin C?
A) Scurvy
B) Pellagra
C) Beriberi
D) Rickets

Answer 5

A

Question 6

What are the primary functions of Vitamin C in the body?
A) Acts as an antioxidant and assists in collagen synthesis.
B) Regulates blood sugar and enhances lipid metabolism.
C) Synthesizes vitamin A and maintains calcium levels.
D) Stimulates bone growth and fortifies nail health.

Answer 6

A

Question 7

*Which statement correctly describes the stability of Vitamin C?
A) It is stable in heat and light but unstable in acidic solutions.
B) It is unstable in heat, light, and alkaline solutions but stable in acidic solutions.
C) It is stable regardless of environmental conditions.
D) It is only stable in alkaline solutions.

Answer 7

B