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Q. No.At physiological pH, the amino acid exists as a zwitter ion because:
1.
It has no net charge.
2.
It has a positive and a negative charge at different parts of the molecule.
3.
It can donate a proton to the surrounding medium.
4.
It can accept a proton from the surrounding medium.
Subtopic: Zwitter ion & Peptide Bond |
88%
From NCERT
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Consider the given two statements:
| Assertion (A): | Glycogen has one reducing end. |
| Reason (R): | The reducing end is where non-reducing sugars can be added to the glycogen molecule. |
| 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: Carbohydrates: Starch & Glycogen |
57%
From NCERT
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Which mechanism best describes the action of enzymes?
| 1. | Enzymes work by increasing the temperature of substrates. |
| 2. | Enzymes reduce the activation energy needed for a reaction. |
| 3. | Enzymes provide ATP to reactions. |
| 4. | Enzymes permanently change shape after a reaction. |
Subtopic: Enzyme Catalysis | Mechanism of Enzymes |
92%
From NCERT
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Which statement about lipids is correct?
| 1. | Lipids are primarily polar and hydrophilic. |
| 2. | Lipids are polymers of amino acids. |
| 3. | Lipids are generally insoluble in water but soluble in organic solvents. |
| 4. | Lipids are made of glycerol and three phosphate groups. |
Subtopic: Lipids |
85%
From NCERT
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Match the following secondary metabolites with their examples as given in the table of NCERT:
Options:
1. 1-A, 2-B, 3-C
2. 1-C, 2-A, 3-B
3. 1-B, 2-C, 3-A
4. 1-C, 2-B, 3-A
| Column A | Column B | ||
| 1. | Alkaloids | A. | Tannins |
| 2. | Terpenoids | B. | Rubber |
| 3. | Polyphenols | C. | Caffeine |
1. 1-A, 2-B, 3-C
2. 1-C, 2-A, 3-B
3. 1-B, 2-C, 3-A
4. 1-C, 2-B, 3-A
Subtopic: Primary & Secondary Metabolites |
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Consider the given two statements:
| Assertion (A): | Lipids are not considered macromolecules. |
| Reason (R): | Lipids are not polymers. |
| 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. | (A) is False but (R) is True |
Subtopic: Lipids |
From NCERT
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Consider the given two statements:
| Assertion (A): | Vitamins are essential components in metabolic processes. |
| Reason (R): | They act as coenzymes and help in the catalysis of biochemical reactions. |
| 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. | (A) is False but (R) is True |
Subtopic: Enzyme Cofactors |
93%
From NCERT
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Which of the following is not a characteristic feature of carbohydrates?
| 1. | Most carbohydrates function primarily as structural components in cell walls. |
| 2. | They serve as energy stores, fuels, and metabolic intermediates. |
| 3. | Carbohydrates are commonly found as steroids and hormones in organisms. |
| 4. | They are involved in cell recognition and signalling processes. |
Subtopic: Carbohydrates |
70%
From NCERT
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Which statement correctly describes the impact of temperature on enzyme activity?
| 1. | Enzyme activity decreases indefinitely as temperature increases due to increased kinetic energy of the substrates. |
| 2. | Enzyme activity increases until an optimum temperature is reached, beyond which activity declines rapidly due to denaturation. |
| 3. | Enzyme activity is independent of temperature changes within the living organism’s permissible range. |
| 4. | High temperatures always increase enzyme stability and, therefore, enhance enzyme activity. |
Subtopic: Factors Affecting Enzyme Catalysis Reaction |
94%
From NCERT
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Match the polysaccharide with its correct function:
1. Only I, II and III
2. Only I, III and IV
3. Only II, III and IV
4. I, II, III and IV
| I. | Starch | - | Storage of glucose in plants |
| II. | Glycogen | - | Storage of glucose in animals |
| III. | Cellulose | - | Structural component of plant cell walls |
| IV. | Chitin | - | Structural component in fungal cell walls and exoskeletons of insects |
2. Only I, III and IV
3. Only II, III and IV
4. I, II, III and IV
Subtopic: Carbohydrates: Starch & Glycogen | Carbohydrates: Cellulose, Chitin, Inulin & Agar |
96%
From NCERT
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