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Quick Biochemistry - Vitamins (Section 9)

1
What substance, either a vitamin itself or a precursor to a vitamin, exhibits antioxidant functions?
Answer
(B)
Vitamin E
2
What vitamin is essential for reactions involving the addition of carbon dioxide (carboxylation)?
Answer
(C)
Biotin
3
What role do tocopherols play in biological activity, partially due to their function?
Answer
(A)
Antioxidant
4
For which process is biotin a critical requirement?
Answer
(B)
Carboxylation
5
Which vitamin functions as a catalyst in cellular respiration?
Answer
(A)
B₂
6
What metal is contained within the structure of Vitamin B₁₂?
Answer
(B)
Cobalt
7
What vitamin is found in significant quantities in whole wheat?
Answer
(D)
Thiamine
8
What vitamin is utilized in managing the condition of homocystinuria?
Answer
(D)
B₆
9
Which of the following is not a constituent of the coenzyme A molecule?
Answer
(C)
Acetic acid
10
What is the most biologically active form of Vitamin D?
Answer
(A)
25-Hydroxycholecalciferol
11
What is a key structural component of flavoproteins?
Answer
(B)
Vitamin B₂
12
Which vitamin is crucial for transamination reactions?
Answer
(C)
B₆
13
How does Vitamin K contribute to the creation of clotting factors?
Answer
(B)
Post translation
14
Which vitamin is required for the production of CoA?
Answer
(A)
Pantothenic acid
15
Which substance acts as a cofactor in transamination?
Answer
(C)
Pyridoxine
16
What compound increases in blood and intracellular fluid when thiamine levels are low?
Answer
(D)
Pyruvic acid
17
Where does the conversion of carotenoids to Vitamin A primarily occur?
Answer
(A)
Intestine
18
Which vitamin is not produced by the human body?
Answer
(C)
C
19
What protein, involved in light reception, requires Vitamin A for its formation?
Answer
(D)
Rhodospin
20
What are the potential effects of excessive Vitamin A intake in children?
Answer
(D)
All of these
21
What substance is protected from oxidation by tocopherols?
Answer
(A)
Vitamin A
22
Which blood clotting factors are regulated by Vitamin K?
Answer
(D)
All of these
23
What color is observed when examining cyanomethmoglobin?
Answer
(D)
Bright red
24
A deficiency in which nutrient impairs transketolase function?
Answer
(D)
Thiamine
25
Where is the enzyme responsible for catalyzing the hydrolysis of glucose-6-PO₄ not present?
Answer
(C)
Muscle
26
From what source was Vitamin K₂ first obtained?
Answer
(B)
Putrid fishmeal
27
Which form of Vitamin A is essential for the visual process?
Answer
(C)
Retinaldehyde
28
An increased intake of which macronutrient elevates the need for a specific vitamin?
Answer
(A)
Thiamine
29
Which vitamin's dietary requirement increases alongside increased protein consumption?
Answer
(A)
Thiamine
30
Which vitamin deficiency is linked to the presence of creatinuria?
Answer
(C)
Vitamin A
31
Which of the following is a biochemical marker used to identify a lack of vitamin B12, as measured in urine?
Answer
(C)
Methyl malonic acid