Q. No.The rate of enzyme action decreases at higher temperature [after a certain value] because the increased heat
1. changes the pH of the system
2. alters the active site of the enzyme
3. neutralizes the acids and bases in the system
4. increases the concentration of the enzyme
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Select the option which is not correct with respect to enzyme action:
1. Substrate binds with enzyme at its active site.
2. Addition of a lot of succinate does not reverse the inhibition of succinic dehydrogenase by malonate.
3. A non-competitive inhibitor binds the enzyme at a site distinct from that which binds the substrate.
4. Malonate is a competitive inhibitor of succinic dehydrogenase.
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Prosthetic groups differ from co-enzymes in that
1. they require metal ions for their activity.
2. they (prosthetic groups) are tightly bound to apoenzymes.
3. their association with apoenzymes is transient.
4. they can serve as co-factors in a number of enzyme-catalyzed reactions.
The essential chemical components of many coenzymes are:
| 1. | Nucleic acid | 2. | Carbohydrates |
| 3. | Vitamins | 4. | Proteins |
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Transition state structure of the substrate formed during an enzymatic reaction is:
| 1. | permanent but unstable | 2. | transient and unstable |
| 3. | permanent and stable | 4. | transient but stable |
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The catalytic efficiency of two different enzymes can be compared by the
1. formation of the product
2. pH optimum value
3. Km value
4. molecular size of the enzyme
In competitive inhibition, if the concentration of the substrate is increased :
1. the rate of the reaction is increased
2. the rate of the reaction is decreased
3. the rate of the reaction is not affected
4. the reaction direction is reversed
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Which of the following components is found in least amounts in an average cell?
| 1. | Carbohydrates | 2. | Fats |
| 3. | Nucleic acids | 4. | Proteins |
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The number of peptide bonds in a protein molecule made of 120 amino acids will be:
| 1. | 60 | 2. | 119 |
| 3. | 120 | 4. | 240 |
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Which one of the following statements is wrong?
1. Glycine is a sulphur containing amino acid.
2. Sucrose is a disaccharide.
3. Cellulose is a polysaccharide.
4. Uracil is a pyrimidine.
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