Jacob and Monod named some enzymes as allosteric whose activity is regulated by:
1. End product
2. Substrate
3. By product
4. Coenzyme
Subtopic: Factors Affecting Enzyme Catalysis Reaction |
Level 3: 35%-60%
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An enzyme catalysed reaction is running optimally at 40oC. If the temperature is reduced to 20oC, the rate of reaction is expected to:
1. Double
2. Half
3. Increase four time
4. Reduce to a quarter
1. Double
2. Half
3. Increase four time
4. Reduce to a quarter
Subtopic: Factors Affecting Enzyme Catalysis Reaction |
54%
Level 3: 35%-60%
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All enzymes are:
| 1. | Proteins |
| 2. | Thermostable |
| 3. | Capable of speeding up a biochemical reaction |
| 4. | Capable of working in alkaline pH |
Subtopic: Enzymes | Factors Affecting Enzyme Catalysis Reaction |
62%
Level 2: 60%+
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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 |
88%
Level 1: 80%+
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Which of the following combination of factors affects enzyme activity?
A. Salinity & pH
B. Temperature
C. Concentration of substrate
D. Temperature & pH
E. pH
Choose the correct answer from the options given below:
1. A only
2. B only
3. C & D only
4. A & B only
Subtopic: Factors Affecting Enzyme Catalysis Reaction |
87%
Level 1: 80%+
Hints
Enzymes A, B and C in the given figure can be:
| A | B | C | |
| 1. | Gastric lipase | Salivary amylase | Lingual lipase |
| 2. | Pepsin | Salivary amylase | Trypsin |
| 3. | Pepsin | Trypsin | Lactase |
| 4. | Rennin | Maltase | Sucrase |
Subtopic: Factors Affecting Enzyme Catalysis Reaction |
70%
Level 2: 60%+
Hints
Read the given statements A, B and C and select the correct option.
| (A) | All enzymes are proteinaceous in nature. |
| (B) | Some competitive inhibitors are often used in the control of bacterial pathogens. |
| (C) | Active site of an enzyme is formed by the folding of the backbone of tertiary structure of protein upon itself. |
| 1. | Statements (A) and (B) are correct |
| 2. | Statements (B) and (C) are correct |
| 3. | Statements (A) and (C) are correct |
| 4. | Statements (A), (B) and (C) are correct |
Subtopic: Proteins | Enzymes | Factors Affecting Enzyme Catalysis Reaction | Properties of Enzymes |
64%
Level 2: 60%+
Hints
Given below are two statements:
In the light of the above statements, choose the correct answer from the options given below:
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.
| 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.
Subtopic: Factors Affecting Enzyme Catalysis Reaction | Enzyme Inhibition |
88%
Level 1: 80%+
NEET - 2023
Hints
The number of correct statements from the given statements are:
1. 2
2. 3
3. 4
4. 5
| I: | Almost all enzymes are proteins. |
| II: | Some nucleic acids can behave like enzymes. |
| III: | No enzyme in living organisms can function above 40 °C. |
| IV: | Enzymes are the reason that chemicals react with each other. |
| V: | Enzymes are not sensitive to pH in their environment. |
2. 3
3. 4
4. 5
Subtopic: Enzymes | Enzyme Catalysis | Factors Affecting Enzyme Catalysis Reaction |
Level 3: 35%-60%
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What would happen to Vmax' in presence of a competitive inhibitor?
1. Decreases
2. Increases
3. Remains the same
4. First increases then decreases
1. Decreases
2. Increases
3. Remains the same
4. First increases then decreases
Subtopic: Factors Affecting Enzyme Catalysis Reaction |
59%
Level 3: 35%-60%
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