The vitamin nicotinamide can be synthesized in our body from.
1. tyrosine
2. tryptophan
3. valinc
4. phenylalanine
Subtopic: Enzymes |
AIIMS - 2002
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NEET 2023 - Target Batch - Aryan Raj Singh
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Which one of the following pairs in not correctly matched?
(1) Vitamin-B12-Pernicious anaemia
(2) Vitamin-B6-Loss of appetite
(3) Vitamin-B1-Beri-beri
(4) Vitamin-B3-Pellagra
Subtopic: Enzymes |
54%
AIIMS - 2012
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NEET 2023 - Target Batch - Aryan Raj Singh
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The statement "All biological catalysts are proteins" is no longer valid after the discovery of:
1. ribonuclease
2. ribozyme
3. RNAs
4. DNAs
Subtopic: Enzymes |
84%
From NCERT
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All enzymes are:
1. Proteins
2. Thermostable
3. Capable of speeding up a biochemical reaction
4. Capable of working in alkaline pH
1. Proteins
2. Thermostable
3. Capable of speeding up a biochemical reaction
4. Capable of working in alkaline pH
Subtopic: Enzymes | Factors Affecting Enzyme Catalysis Reaction |
59%
From NCERT
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| A. | Release of products of the reaction |
| B. | Binding of substrate to the active site of the enzyme |
| C. | Formation of enzyme-substrate complex |
| D. | Alteration in the shape of the enzyme |
| E. | Enzyme free to bind another molecule of substrate |
1. B > C > D > A > E
2. B > D > C > A > E
3. B > D > A > E > C
4. B > E > D > C > A
Subtopic: Enzymes | Enzyme Catalysis |
54%
From NCERT
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Read the given statements A, B and C and select the correct option.
1. Statements (A) and (B) are correct
2. Statements (B) and (C) are correct
3. Statements (A) and (C) are correct
4. Statements (A), (B) and (C) are correct
| (A) | All enzymes are proteinaceous in nature. |
| (B) | Some competitive inhibitors are often used in the control of bacterial pathogens. |
| (C) | Active site of an enzyme is formed by the folding of the backbone of tertiary structure of protein upon itself. |
2. Statements (B) and (C) are correct
3. Statements (A) and (C) are correct
4. Statements (A), (B) and (C) are correct
Subtopic: Proteins | Enzymes | Factors Affecting Enzyme Catalysis Reaction | Properties of Enzymes |
58%
From NCERT
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Read the statements A and B carefully and select the correct answer.
Statement A: Enzyme-substrate complex produced during a catalysed reaction is highly reactive.
Statement B: This complex dissociates into its product and changed enzyme with an intermediate formation of enzyme-product
complex.
1. Both statements A and B are correct
2. Both statements A and B are incorrect
3. Only statement A is correct
4. Only statement A is incorrect
Statement A: Enzyme-substrate complex produced during a catalysed reaction is highly reactive.
Statement B: This complex dissociates into its product and changed enzyme with an intermediate formation of enzyme-product
complex.
1. Both statements A and B are correct
2. Both statements A and B are incorrect
3. Only statement A is correct
4. Only statement A is incorrect
Subtopic: Enzymes | Enzyme Catalysis |
From NCERT
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Which of the following statements about enzymes is wrong?
| 1. | Enzymes are denatured at high temperatures |
| 2. | Enzymes are mostly proteins but some are lipids also |
| 3. | Enzymes are highly specific. |
| 4. | Enzymes require optimum pH and temperature for maximum activity. |
Subtopic: Enzymes |
83%
From NCERT
NEET - 2013
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Rates of physical and chemical processes are influenced by temperature among other factors. A general rule of thumb is that rate:
| 1. | doubles by half for every 10°C change in either direction |
| 2. | decreases by half for every 10°C change in either direction |
| 3. | doubles or decreases by half for every 10°C change in either direction |
| 4. | doubles or decreases by half for every 5°C change in either direction |
Subtopic: Enzymes | Enzyme Catalysis |
76%
From NCERT
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In the absence of an enzyme, the catalysed reaction:
| 1. | does not take place |
| 2. | takes place at a very slow rate |
| 3. | takes place at a higher rate |
| 4. | is not affected at all |
Subtopic: Enzymes | Enzyme Catalysis |
82%
From NCERT
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