Unlock IMPORTANT QUESTION
This question was bookmarked by 5 NEET 2025 toppers during their NEETprep journey. Get Target Batch to see this question.
✨ Perfect for quick revision & accuracy boost
Buy Target Batch
Access all premium questions instantly
The vitamin nicotinamide can be synthesized in our body from.
| 1. | tyrosine | 2. | tryptophan |
| 3. | valinc | 4. | phenylalanine |
Subtopic: Enzymes |
Level 3: 35%-60%
AIIMS - 2002
Hints
Unlock IMPORTANT QUESTION
This question was bookmarked by 5 NEET 2025 toppers during their NEETprep journey. Get Target Batch to see this question.
✨ Perfect for quick revision & accuracy boost
Buy Target Batch
Access all premium questions instantly
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 |
53%
Level 3: 35%-60%
AIIMS - 2012
Hints
The statement "All biological catalysts are proteins" is no longer valid after the discovery of: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 |
85%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
All enzymes are:
| 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 |
62%
Level 2: 60%+
Please attempt this question first.
Hints
Please attempt this question first.
| 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 |
57%
Level 3: 35%-60%
Please attempt this question first.
Hints
Please attempt this question first.
Read the given statements A, B and C and select the correct option.
| (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. |
| 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 |
Subtopic: Proteins | Enzymes | Factors Affecting Enzyme Catalysis Reaction | Properties of Enzymes |
64%
Level 2: 60%+
Hints
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 |
Subtopic: Enzymes | Enzyme Catalysis |
Level 3: 35%-60%
Hints
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 |
85%
Level 1: 80%+
NEET - 2013
Hints
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 |
79%
Level 2: 60%+
Please attempt this question first.
Hints
Please attempt this question first.
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 |
85%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
© 2026 GoodEd Technologies Pvt. Ltd.