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Essential Biochemistry - Vitamins (Section 6)

1
What is the role of biotin in carbohydrate metabolism?
Answer
(A)
It is involved in the carboxylation of pyruvate
2
In which metabolic pathway does Thiamine Pyrophosphate (TPP) play a key role?
Answer
(B)
Citric acid cycle
3
The active form of Thiamine is
Answer
(B)
Thiamine diphosphate (TDP)
4
Which ring is part of the structure of thiamine?
Answer
(B)
Pyrimidine
5
In what form is Vitamin B12 stored in the liver?
Answer
(C)
Adenosylcobalamin
6
Which of the following reactions does PLP act as a coenzyme?
Answer
(B)
Amino acid decarboxylation
7
Which of the following is a dietary source rich in Vitamin B3?
Answer
(C)
Meats, poultry and fish
8
What is the primary role of PLP (pyridoxal phosphate)?
Answer
(B)
Coenzyme in amino acid metabolism
9
Which deficiency is characterized by cheilosis and glossitis?
Answer
(B)
Riboflavin
10
What is the deficiency disease associated with niacin (vitamin B3)?
Answer
(B)
Pellagra
11
Which of the following coenzymes is not derived from vitamins?
Answer
(D)
Coenzyme Q
12
Which of the following coenzymes are associated with niacin?
Answer
B
C
13
What is the precursor of retinol?
Answer
(C)
β-carotene
14
Which of the following is a function of FAD and FMN?
Answer
(A)
Act as coenzymes in oxidation-reduction reactions
15
Which vitamin is important for the synthesis of sphingolipids?
Answer
(B)
B6
16
The symptoms of pellagra include all EXCEPT:
Answer
(D)
Anemia
17
Which of the following is a clinical manifestation of Niacin deficiency?
Answer
(B)
Pellagra
18
Which of the following reactions does Niacin participate in?
Answer
(C)
Oxidation-reduction reactions
19
Both Wernicke's disease and beriberi can be treated by administering vitamin:
Answer
(A)
Thiamine
20
Which deficiency is indicated by the presence of Wernicke-Korsakoff syndrome?
Answer
(A)
Thiamin (B1)
21
What is the role of Pantothenic acid (Vitamin B5) in cellular metabolism?
Answer
(A)
It is part of coenzyme A (CoA), essential for metabolism of fats, carbohydrates and proteins.
22
The active forms of vitamin B2 (Riboflavin) are:
Answer
(A)
FMN and FAD
23
Which vitamin is essential for the synthesis of the neurotransmitter GABA?
Answer
(C)
Vitamin B6
24
Which of the following is a good source of Vitamin D?
Answer
B
C
D
25
Which form of vitamin B6 is most active and is used as a coenzyme?
Answer
(B)
Pyridoxal phosphate
26
What are the primary symptoms associated with pellagra?
Answer
(A)
Skin rashes, confusion, and diarrhea
27
Which food group is a good source of Pantothenic acid?
Answer
(B)
Meats and whole grains
28
Thiamine pyrophosphate is required for the following enzymatic activity:
Answer
(B)
Transketolase
29
What is a major function of Vitamin B5?
Answer
(A)
Involved in energy metabolism
30
The active form of Vitamin A is:
Answer
(D)
All of the above
31
Which of the following is a fat-soluble vitamin?
Answer
(C)
Vitamin K
32
What is the role of FMN (Flavin Mononucleotide) in the body?
Answer
(B)
Functions as a coenzyme in redox reactions
33
Which form of thiamine is utilized as a coenzyme in the body?
Answer
(C)
Thiamine diphosphate
34
Which of the following is NOT a function of Folic Acid?
Answer
(D)
Folic acid is not necessary for the synthesis of amino acids
35
What is the characteristic of infantile beriberi?
Answer
(A)
Affects infants breastfed by thiamine-deficient mothers
36
Which of the following is a dietary source of Riboflavin?
Answer
(D)
Eggs
37
Which of the following vitamin is required for collagen synthesis?
Answer
(A)
Ascorbic acid
38
What is the active form of folic acid?
Answer
(C)
Tetrahydrofolate (THF)
39
Which enzyme is involved in the synthesis of methionine from homocysteine?
Answer
(A)
Methionine Synthase
40
Which of the following is used as an assay of riboflavin status?
Answer
(B)
Glutathione reductase
41
Which of the following is a precursor of Vitamin A?
Answer
(D)
β-Carotene
42
Which of the following is a sign of B2 deficiency?
Answer
(D)
All of the above
43
Thiamine (vitamin B1) consists of
Answer
(A)
a thiazole ring attached to a pyrimidine ring by methylene bridge
44
What is the primary function of thiamine (Vitamin B1) in the body?
Answer
(B)
Involved in carbohydrate metabolism
45
What is the name of Vitamin B3?
Answer
(B)
Niacin
46
Which vitamin is important for the synthesis of niacin from tryptophan?
Answer
(C)
B6
47
Which of the following diseases is linked to a deficiency of vitamin B1?
Answer
(C)
Beriberi
48
Which vitamin deficiency causes cheilosis (cracks at the corners of the mouth)?
Answer
(B)
Vitamin B2