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Essential Biochemistry - Vitamins (Section 3)

1
What is the role of vitamin A in vision?
Answer
(C)
Both A and B
2
Where is folic acid found?
Answer
A
B
3
What is the RDI for niacin?
Answer
(B)
15 mg
4
What is the deficiency disease associated with Vitamin B6?
Answer
(D)
None of the above
5
What is the primary function of vitamin D?
Answer
(A)
Calcium absorption
6
The metabolic process that is most directly affected by Vitamin A is:
Answer
(A)
Vision
7
What are the forms of Vitamin B6?
Answer
A
B
C
8
Pyridoxal phosphate is a coenzyme for the reactions, except:
Answer
(D)
Oxidation-reduction
9
What is a result of Vitamin A deficiency?
Answer
(A)
Night blindness
10
Which of the following is NOT a function of Vitamin A?
Answer
(D)
Calcium absorption
11
In the eye, retinal is involved in:
Answer
(A)
Photoreceptor function
12
Biotin is synthesized by:
Answer
(A)
Microorganisms in the intestine
13
Which of the following is a function of Vitamin C?
Answer
A
B
C
14
What enzyme is responsible for the conversion of acetyl-CoA to malonyl-CoA?
Answer
(A)
Acetyl-CoA carboxylase
15
Biotin is involved in:
Answer
(B)
Carboxylation
16
Which vitamin is a precursor for coenzyme A?
Answer
(C)
Pantothenic acid
17
Which is NOT a function of Vitamin C?
Answer
(C)
Production of thromboxane
18
Increased prothrombin time is observed in the deficiency of:
Answer
(B)
Vitamin K
19
Where is biotin primarily absorbed?
Answer
(B)
Small intestine
20
Biotin is essential for the carboxylation of which of the following?
Answer
(B)
Fatty acids
21
Beriberi is caused by a deficiency of:
Answer
(A)
Thiamin
22
Which enzyme is responsible for the conversion of thiamine to thiamine pyrophosphate?
Answer
(C)
Thiamine pyrophosphokinase
23
What is the DRI for vitamin B6?
Answer
(B)
1.4 mg
24
Which enzyme uses biotin as a co-factor in the conversion of pyruvate to oxaloacetate?
Answer
(B)
Pyruvate carboxylase
25
Which of the following is not derived from plant?
Answer
(B)
Menaquinone
26
Which form of Vitamin D is produced in the skin upon exposure to sunlight?
Answer
(A)
Cholecalciferol
27
Which form of folic acid is active?
Answer
(A)
Tetrahydrofolate (THF)
28
Which vitamin enhances iron absorption?
Answer
(A)
Vitamin C
29
Thiamine pyrophosphate is required for the following enzymatic activity:
Answer
(B)
Transketolase
30
What is the RDA of Biotin for adults?
Answer
(B)
30 mcg
31
What reaction does the enzyme Thymidylate synthase catalyze?
Answer
(A)
dUMP to dTMP
32
Which vitamin can be destroyed by the use of diuretics?
Answer
(D)
Pyridoxine
33
Rickets is due to deficiency of:
Answer
(A)
Vitamin D
34
The active form of Vitamin D is also known as:
Answer
(C)
Calcitriol
35
How is Vitamin A transported in the blood?
Answer
(A)
Bound to retinol-binding protein
36
What is the primary function of niacin (Vitamin B3)?
Answer
(C)
Coenzyme in redox reactions
37
What is the role of PLP?
Answer
(B)
Transamination reactions
38
Which of the following are required for the synthesis of methionine from homocysteine?
Answer
A
B
39
What is the role of folic acid during pregnancy?
Answer
(A)
Prevention of neural tube defects
40
What reaction does the enzyme thymidylate synthase catalyze?
Answer
(A)
Conversion of deoxyuridylate (dUMP) to thymidylate (dTMP)
41
What is the immediate precursor to the active form of vitamin D in the kidney?
Answer
(C)
25-hydroxycholecalciferol
42
What compound is formed by the carboxylation of acetyl-CoA?
Answer
(A)
Malonyl-CoA
43
Which of the following are sources of vitamin E?
Answer
A
B
C
D
44
Which enzyme activates Vitamin D in the kidney?
Answer
(A)
1-alpha-hydroxylase
45
The deficiency of which vitamin leads to scurvy?
Answer
(C)
Vitamin C
46
What is the main dietary source of Vitamin C?
Answer
(B)
Fruits and vegetables
47
Both Wernicke's disease and beriberi can be treated by administering vitamin:
Answer
(A)
Thiamine
48
Vitamin B6 exists as:
Answer
A
B
C
49
Which of the following is a characteristic symptom of infantile beriberi?
Answer
(B)
Heart failure
50
What is the RDA for Vitamin B5 (Pantothenic acid)?
Answer
(A)
5 mg