The steps in catalytic cycle of an enzyme action are given in random order

I. The enzyme releases the products. Now enzyme is free to bind another substrate

II. The active sites, now in close proximity of substrate break the bond of substrate and E – P complex forms

III. Binding of substrate induces the enzyme to alter its shape fitting more tightly around the substrate

IV. The substrate binds to the active site of enzyme (i.e., fitting into the active site.
The correct order is

1. I, II, III, IV

2. IV, III, II, I

3. I, III, II, IV

4. I, II, IV, III

Subtopic:  Enzyme Catalysis |
 89%
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All enzymes are proteins except

1. Trypsin

2. Pepsin

3. Steapsin

4. Ribozyme and Ribonuclease-P

Subtopic:  Enzyme Catalysis |
 87%
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Enzymes catalyse biochemical reactions by

1. Lowering the activation energy

2. Increasing the activation energy

3. Establishing stable bonds with substrate

4. Increasing temperature

Subtopic:  Enzyme Catalysis |
 88%
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Which of the following is correct for enzyme catalysed reaction?

1.Substrate is converted into Enzyme

2.Substrate is consumed in the reaction completely

3.Substrate is converted to product

4.Enzyme is converted to product

Subtopic:  Enzyme Catalysis |
 86%
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The figure given below shows the conversions of a substrate into product by an enzyme. In which one of the four options (1-4), the components of the reaction labelled as A, B, C and D are identified correctly:

 Options

 A B C D
1. Transition
state
Potential
energy
Activation
energy
without
enzyme
Activation
energy with
enzyme
2. Potential
energy
Transition
state
Activation
energy with
enzyme
Activation
energy
without
enzyme
3. Activation
energy with
enzyme
Transition
state
Activation
energy
without
enzyme
Potential
energy
4. Potential
energy
Transition
state
Activation
energy
without
enzyme
Activation
energy with
enzyme
Subtopic:  Enzyme Catalysis |
 85%
From NCERT
AIPMT - 2010
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Transition state structure of the substrate formed during an enzymatic reaction is

1.transient but stable

2.permanent but unstable

3.transient and unstable

4.permanent and stable

Subtopic:  Enzyme Catalysis |
 85%
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During catalytic cycle of an enzyme–

1. Enzyme alter its shape to fit the substrate
molecule.

2. Substrate alter its shape to get fit into the
enzyme molecule.

3. Both enzyme and substrate changes its shape
during transition state.

4. Enzyme and substrate are rigid molecular
structure and it never changes its shape.

Subtopic:  Enzyme Catalysis |
 58%
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