The back bone of RNA consists of which of the following sugar?
1. Deoxyribose
2. Ribose
3. Sucrose
4. Maltose
Subtopic: Â Nucleic Acid |
 84%
Level 1: 80%+
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Subtopic: Â Nucleic Acid |Â The DNA |
 80%
Level 1: 80%+
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Which of the following is a primary metabolite?
1. Carotenoid
2. Glucose
3. Morphine
4. Cellulose
1. Carotenoid
2. Glucose
3. Morphine
4. Cellulose
Subtopic: Â Primary & Secondary Metabolites |
 80%
Level 1: 80%+
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What would happen to Vmax' in presence of a competitive inhibitor?
1. Decreases
2. Increases
3. Remains the same
4. First increases then decreases
1. Decreases
2. Increases
3. Remains the same
4. First increases then decreases
Subtopic: Â Factors Affecting Enzyme Catalysis Reaction |
 58%
Level 3: 35%-60%
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Study the following graph of concept of activation energy given below. Select the correct option for stages labelled A to D.
| A | B | C | D | |
| 1 | Transition State | Potential energy | Activation energy without enzyme | Activation energy with enzyme |
| 2 | Kinetic energy | Potential energy | Activation energy without enzyme | Activation energy with enzyme |
| 3 | Potential energy | Transition state | Activation energy without enzyme | Activation energy with enzyme |
| 4 | Potential energy | Transition state | Activation energy without enzyme | Activation energy with enzyme |
Subtopic: Â Enzyme Catalysis |
 80%
Level 1: 80%+
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An example of protein with quaternary structure is
1. Myoglobin
2. Haemoglobin
3. Keratin
4. All of these
1. Myoglobin
2. Haemoglobin
3. Keratin
4. All of these
Subtopic: Â Proteins |
 78%
Level 2: 60%+
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The nitrogenous bases of the two strands of DNA are joined by
1. Phosphodiester bond
2. Hydrogen bond
3. Glycosidic bond
4. Peptide bond
1. Phosphodiester bond
2. Hydrogen bond
3. Glycosidic bond
4. Peptide bond
Subtopic: Â Nucleic Acid |
 62%
Level 2: 60%+
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What should be added to a nucleoside to yield a nucleotide?
1. Sugar
2. Phosphoric acid
3. Nitrogenous base
4. Sugar and nitrogenous base
1. Sugar
2. Phosphoric acid
3. Nitrogenous base
4. Sugar and nitrogenous base
Subtopic: Â Nucleic Acid: Nucleotides |
 90%
Level 1: 80%+
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Study the following statements :
Select the option which includes all correct statements :
| a. | The substrate binds to the active site of the enzyme. |
| b. | Enzymes isolated form thermophilic organisms get denatured at 50o C. |
| c. | The active site of enzyme breaks the chemical bonds of the product. |
| d. | Prosthetic groups are tightly bound to the apoenzyme. |
| 1. | (a) & (c) | 2. | (c) & (d) |
| 3. | (b) & (c) | 4. | (a) & (d) |
Subtopic: Â Enzyme Cofactors |Â Mechanism of Enzymes |
 77%
Level 2: 60%+
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Electron transferring enzymes belong to
1. Transferases
2. Oxidoreductases
3. Lyases
4. Isomerases
1. Transferases
2. Oxidoreductases
3. Lyases
4. Isomerases
Subtopic: Â Enzymes Classification |
 71%
Level 2: 60%+
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