- 1(current)
Q. No.Select the option which is not correct with respect to enzyme action.
1. Substrate binds with enzyme as its active site
2. Addition of lot of succinate does not reverse the inhibition of succinic dehydogenase 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
Given below is the graph showing the effect of substrate concentration on enzyme activity. In the presence of a competitive inhibitor, when the concentration of the substrate is progressively increased:
| 1. | The Km value increases but the reaction will not achieve Vmax |
| 2. | The Km value increases but the reaction can ultimately achieve Vmax |
| 3. | The Km value decreases but the reaction will not achieve Vmax |
| 4. | The Km value decreases but the reaction can ultimately achieve Vmax |
The inhibition of succinic dehydrogenase by malonate is an example of
1. competitive inhibition
2. non-competitive inhibition
3. allosteric modulation
4. none of the above
In competitive inhibition:
(1) Inhibitor resembles the substrate in molecular structure
(2) Competition between substrates and inhibitors to occupy active sites
(3) Binding the inhibitors to activities sites declines the enzyme action
(4) All are correct
The competitive inhibitor of enzyme succinic dehydrogenase is
1. succinate
2. malonate
3. malate
4. mannose
| 1. | Dinitrogenase | 2. | Succinic dehydrogenase |
| 3. | Amylase | 4. | Lipase |
| Statement I: | Low temperature preserves the enzyme in a temporarily inactive state whereas high temperature destroys enzymatic activity because proteins are denatured by heat. |
| Statement II: | When the inhibitor closely resembles the substrate in its molecular structure and inhibits the activity of the enzyme, it is known as competitive inhibitor. |
1. Statement I is false but Statement II is true.
2. Both Statement I and Statement II are true.
3. Both Statement I and Statement II are false.
4. Statement I is true but Statement II is false.
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Q. No.
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