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Q. No.Regarding various levels of protein structure, which of the following is not true?
| 1. | The positional information of amino acids in a protein is called the primary structure. |
| 2. | Alpha helix is a secondary structure and beta pleated sheet is a tertiary structure of a protein. |
| 3. | Tertiary structure is absolutely necessary for the many biological activities of proteins. |
| 4. | Quaternary structures are seen in proteins made of more than one polypeptide chain. |
Subtopic: Proteins |
87%
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In a typical cell, which of the following constitutes least % of the total cellular mass?
| 1. | Proteins | 2. | Nucleic acids |
| 3. | Carbohydrates | 4. | Lipids |
Subtopic: Primary & Secondary Metabolites |
72%
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Regarding RuBisCO:
| I: | It is the most abundant protein in the whole of the biosphere. |
| II: | Mg2+ is its activator |
| 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: Proteins |
78%
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The unique properties of each amino acid is determined by its particular:
1. R group
2. amino group
3. kinds of peptide bond
4. number of bonds to other amino acids
Subtopic: Amino Acids |
88%
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Which of the following is the least likely to be involved in stabilizing the three-dimensional folding of most proteins?
| 1. | Ester bonds | 2. | Hydrogen bonds |
| 3. | Electrostatic interaction | 4. | Hydrophobic interaction |
Subtopic: Proteins |
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The essential chemical components of many coenzymes are:
| 1. | Nucleic acid | 2. | Carbohydrates |
| 3. | Vitamins | 4. | Proteins |
Subtopic: Enzyme Cofactors |
86%
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Regarding factors affecting enzyme activity:
| I: | Low temperature preserves the enzyme in a temporarily inactive state whereas high temperature destroys enzymatic activity. |
| II: | With the increase in substrate concentration, the velocity of the enzymatic reaction rises at first. |
| 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: Factors Affecting Enzyme Catalysis Reaction |
87%
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Even in the presence of malonate, the velocity of the reaction catalyzed by the enzyme succinic dehydrogenase can be increased by:
1. increasing the temperature beyond 400C
2. decreasing the pH
3. increasing the concentration of succinate
4. decreasing the production of ATP by chemiosmosis
Subtopic: Mechanism of Enzymes |
86%
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Identify the incorrectly matched pair:
| 1. | Lecithin | Phospholipid |
| 2. | Aromatic amino acid | Threonine |
| 3. | Cytidine | Nucleoside |
| 4. | Trihydroxy propane | Glycerol |
Subtopic: Amino Acids |
82%
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
In the light of the above statements choose the correct answer from the options given below:
| Assertion (A): | Lipids are macromolecules |
| Reason (R): | They have a molecular weight range of ten thousand Daltons and above. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Element Analysis |
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