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Q. No.Tyrosine, phenylalanine and tryptophan are all:
1. Acidic amino acids
2. Sulphur containing amino acids
3. Essential amino acids
4. Aromatic amino acids
Subtopic: Amino Acids |
91%
From NCERT
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Consider the given two statements:
| Assertion (A): | Dietary proteins are the source of essential amino acids. |
| Reason (R): | Amino acids are organic compounds containing an amino group and an acidic group as substituents on the same carbon. |
| 1. | Both (A) and (R) are True but the (R) does not explain (A). |
| 2. | (A) is True but (R) is False. |
| 3. | Both (A) and (R) are True and (R) correctly explains (A). |
| 4. | (A) is False but (R) is True. |
Subtopic: Amino Acids |
82%
From NCERT
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When the co-factor is removed from the enzyme:
1. catalytic activity is lost
2. catalytic activity is reduced
3. catalytic activity increases
4. catalytic activity remains same
1. catalytic activity is lost
2. catalytic activity is reduced
3. catalytic activity increases
4. catalytic activity remains same
Subtopic: Enzyme Cofactors |
84%
From NCERT
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Subtopic: Lipids |
75%
From NCERT
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A protein is imagined as a line, where:
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: | the left end is represented by the first amino acid and the right end is represented by the last amino acid. |
| II: | the first amino acid is also called as C-terminal amino acid and the last amino acid is called the N-terminal amino acid. |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Proteins |
79%
From NCERT
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Consider the given two statements:
| Assertion (A): | Lipids separate in the macromolecular fraction of a cell. |
| Reason (R): | Lipids are associated with membranes in a cell. |
| 1. | Both (A) and (R) are True but (R) does not explain (A). |
| 2. | (A) is True but (R) is False. |
| 3. | Both (A) and (R) are True and (R) correctly explains the (A). |
| 4. | (A) is False but (R) is True. |
Subtopic: Element Analysis |
From NCERT
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α-amino acids are:
1. substituted methanes
2. only 20 in number
3. not required in diet by humans
4. all acidic in nature
1. substituted methanes
2. only 20 in number
3. not required in diet by humans
4. all acidic in nature
Subtopic: Different Amino Acids |
85%
From NCERT
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The catalytic cycle of an enzyme action can be described in certain steps. Which of the following is not true in this regard?
| 1. | The substrate binds to the active site of the enzyme, fitting into the active site. |
| 2. | The binding of the substrate induces the enzyme to alter its shape, fitting more tightly around the substrate. |
| 3. | The active site of the enzyme, now in close proximity of the substrate breaks the chemical bonds of the substrate and the new enzyme- product complex is formed. |
| 4. | The enzyme releases the products of the reaction and the enzyme is used up and cannot be used again. |
Subtopic: Mechanism of Enzymes | Enzyme Introduction |
92%
From NCERT
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Consider the given two statements:
| Assertion (A): | With the increase in substrate concentration, the velocity of the enzymatic reaction rises at first but ultimately reaches a maximum velocity which is not exceeded by any further rise in concentration of the substrate. |
| Reason (R): | The enzyme molecules are fewer than the substrate molecules and after saturation of these molecules, there are no free enzyme molecules to bind with the additional substrate molecules. |
| 1. | (A) is True but (R) is False |
| 2. | Both (A) and (R) are True but (R) does not explain (A) |
| 3. | (A) is False but (R) is True |
| 4. | Both (A) and (R) are True and (R) correctly explains (A) |
Subtopic: Properties of Enzymes | Mechanism of Enzymes | Enzyme Introduction |
92%
From NCERT
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The molecule shown in the given figure:
| 1. | is a lipid |
| 2. | constitutes majority of a cell membrane in animal cells |
| 3. | is a macromolecule |
| 4. | is hydrophilic |
Subtopic: Element Analysis |
66%
From NCERT
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