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Q. No.Which of the following is an example of a prosthetic group?
1.
NAD+
2.
FAD
3.
Heme
4.
Coenzyme A
Subtopic: Enzyme Cofactors |
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Refer to the graph showing the effect of substrate concentration on enzyme activity. Which of the following statements is correct?
| 1. | The reaction rate increases linearly with increasing substrate concentration. |
| 2. | The reaction rate reaches a maximum at a specific substrate concentration. |
| 3. | The enzyme is completely saturated with substrate at low concentrations. |
| 4. | The reaction rate is independent of substrate concentration. |
Subtopic: Mechanism of Enzymes |
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Which of the following secondary metabolites is a powerful toxin?
| 1. | Concanavalin A | 2. | Codeine |
| 3. | Abrin | 4. | Vinblastine |
Subtopic: Primary & Secondary Metabolites |
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Which of the following components makes up the highest percentage of the total cellular mass with respect to an average composition of cells?
1. Water
2. Proteins
3. Carbohydrates
4. Nucleic acids
1. Water
2. Proteins
3. Carbohydrates
4. Nucleic acids
Subtopic: Element Analysis |
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The ability of starch to form a complex with iodine is due to its:
| 1. | Reducing properties. | 2. | Glycosidic linkages. |
| 3. | Helical structure. | 4. | High molecular weight. |
Subtopic: Carbohydrates: Starch & Glycogen |
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What level of protein structural organization is shown in the given figure?
1. Primary
2. Secondary – alpha helix
3. Secondary – beta pleated sheet
4. Tertiary
1. Primary
2. Secondary – alpha helix
3. Secondary – beta pleated sheet
4. Tertiary
Subtopic: Structural Organisation of Proteins |
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The molecule shown in the given figure:
I: is a substituted purine
II: is a structural component of cholesterol
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
I: is a substituted purine
II: is a structural component of cholesterol
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Nucleic Acid: Nucleotides |
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Consider the given two statements:
| Statement I: | Nucleotides consist of a nitrogenous base, a pentose sugar, and a phosphate group. |
| Statement II: | Uracil is a nitrogenous base found in both DNA and RNA. |
| 1. | Statement I is correct; Statement II is correct |
| 2. | Statement I is correct; Statement II is incorrect |
| 3. | Statement I is incorrect; Statement II is correct |
| 4. | Statement I is incorrect; Statement II is incorrect |
Subtopic: Nucleic Acid: Nucleotides |
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A zwitterionic form of an amino acid exists when which of the following conditions are met in solution?
| 1. | The amino group is protonated, and the carboxyl group is deprotonated. |
| 2. | Both the amino and carboxyl groups are neutral. |
| 3. | Both the amino and carboxyl groups are protonated. |
| 4. | Both the amino and carboxyl groups are deprotonated. |
Subtopic: Amino Acids |
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A high fever is dangerous to a human because enzymes are ______________ by heat; without their ____________, enzymes can no longer function
| 1. | denatured, specific structure |
| 2. | destabilized, tertiary structure |
| 3. | unfolded, catalytic ability |
| 4. | inactivated, active sites |
Subtopic: Enzymes | Factors Affecting Enzyme Catalysis Reaction |
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