What vitamin is essential for changing phydroxyphenylpyruvate into homogentisate?
Trả lời
(D)
Niacin
2
Which vitamin is necessary for the conversion of folic acid into folinic acid?
Trả lời
(C)
Ascorbic acid
3
What substance can be reduced by ascorbic acid?
Trả lời
(C)
2, 6-Dichlorophenol indophenol
4
Which vitamin is typically depleted in sterilized milk?
Trả lời
(C)
Vitamin C
5
What condition results from a lack of a specific vitamin?
Trả lời
(D)
Vitamin C
6
Both Wernicke's disease and beriberi can be treated with the administration of which vitamin?
Trả lời
(B)
Thiamin
7
What is a consequence of a lack of Vitamin B₁?
Trả lời
(C)
Beriberi
8
Which vitamin's deficiency leads to elevated levels of pyruvic and lactic acid in the blood?
Trả lời
(A)
Thiamin
9
The coenzyme TPP, derived from which vitamin, is crucial for what process?
Trả lời
(A)
Oxidative decarboxylation
10
An increase in glucose intake necessitates a greater dietary intake of which vitamin?
Trả lời
(D)
Thiamin
11
In an alkaline solution, what substance is used to convert thiamin to thiochrome through oxidation?
Trả lời
(B)
Potassium ferricyanide
12
Riboflavin acts as a coenzyme in reactions catalyzed by which of the following enzymes?
Trả lời
(B)
Acyl CoA dehydrogenase
13
What is the approximate daily riboflavin intake, in milligrams, recommended for adults?
Trả lời
(B)
1.2-1.7
14
Which vitamin deficiency can result in hyperbilirubinemia in newborns undergoing phototherapy?
Trả lời
(B)
Riboflavin
15
Which of the following conditions is a consequence of riboflavin deficiency?
Trả lời
(A)
Cheilosis
16
What vitamin deficiency is associated with a magenta-colored tongue?
Trả lời
(A)
Riboflavin
17
Which vitamin deficiency is linked to corneal vascularization?
Trả lời
(B)
B2
18
Which of the following is known as the pellagra-preventing factor?
Trả lời
(C)
Niacin
19
Pellagra is a condition that arises from a deficiency of which vitamin?
Trả lời
(D)
Niacin
20
Niacin, also known as nicotinic acid, is derived from which of the following?
Trả lời
(A)
Pyridine
21
What is the starting material for niacin production within the human body?
Trả lời
(A)
Tryptophan
22
Which of the following amino acids is typically lacking in the proteins found in corn?
Trả lời
(C)
Tryptophan
23
In what form is niacin typically found in corn?
Trả lời
(C)
Niacytin
24
Approximately how much tryptophan is needed to produce 1 mg of niacin in the body?
Trả lời
(B)
60 mg of tryptophan
25
In populations that rely heavily on which of the following grains is pellagra most commonly observed?
Trả lời
(C)
Maize
26
Which type of enzymes utilize nicotinamide as a coenzyme?
Trả lời
(A)
Dehydrogenases
27
What is the recommended daily intake of Vitamin D?
Trả lời
(A)
400 I.U.
28
Which vitamin's structural composition lacks a ring structure?
Trả lời
(A)
Pantothenic acid
29
Pantothenic acid is a key component in a coenzyme involved in which metabolic process?
Trả lời
(C)
Acetylation
30
From which of the following is CoA derived?
Trả lời
(D)
Pantothenate
31
What nutritional deficiency is linked to 'burning foot syndrome'?
Trả lời
(A)
Pantothenic acid
32
Which biochemical process centrally involves pyridoxal phosphate?
Trả lời
(D)
Transamination
33
Which vitamin serves as a coenzyme for transaminase function?
Trả lời
(C)
Pyridoxal phosphate
34
Which medication can potentially lead to a vitamin B, deficiency?
Trả lời
(A)
Isoniazid
35
Which population group is at higher risk of vitamin B, deficiency?
Trả lời
(C)
Alcoholics
36
What vitamin deficiency is assessed using the 'xanthurenic acid index'?
Trả lời
(A)
Pyridoxal
37
What vitamin deficiency has been associated with epileptiform convulsions in infants?
Trả lời
(C)
B
38
Which type of enzyme utilizes biotin as a coenzyme?
Trả lời
(A)
Carboxylase
39
What coenzyme is required for the conversion of pyruvate to oxaloacetate?
Trả lời
(D)
Biotin
40
How is biotin attached to enzymes within biotin-containing enzymes?
Trả lời
(C)
An amide linkage to an amino group of lysine
41
In a carboxylation reaction where biotin acts as a coenzyme, a CO₂ molecule is captured. To which part of the biotin molecule is the carboxyl group covalently linked?
Trả lời
(A)
A nitrogen atom (N₁) within the biotin structure
42
What nutritional deficiency can arise from eating uncooked eggs?
Trả lời
(A)
Biotin
43
Which compound or its derivative is essential for transforming acetyl CoA into malonylCoA?
Trả lời
(D)
Biotin
44
Which cofactor is necessary for the oxidative decarboxylation of pyruvate?
Trả lời
(A)
Lipoate
45
The core structure of B₁₂, known as the corrin ring system, includes which element?
Trả lời
(A)
Cobalt
46
In vitamin B₁₂, the central cobalt atom is bound to which type of group?
Trả lời
(A)
Cyanide group
47
The complex corrin ring of vitamin B₁₂ is composed of four of what type of rings?
Trả lời
(C)
Pyrrole rings
48
What is the empirical formula of cobalamin?
Trả lời
(D)
C63H88N14O14P.CO
49
A lack of vitamin B₁₂ can lead to which medical condition?
Trả lời
(C)
Pernicious anemia
50
How can a vitamin B₁₂ deficiency be identified through analysis of urine?
