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Michaelis-Menten Model

An enzyme pro...

Question

An enzyme promotes a chemical reaction by

A

Increasing molecular motion

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B

Lowering the energy of activation

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C

Causing the release of heat, which acts as a primer

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D

Changing the free energy difference between substrate and product

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Solution

The correct option is B Lowering the energy of activation
Enzymes are the biocatalyst that operates by promoting a chemical reaction by lowering the energy of activation.
So, the correct option is 'Lowering the energy of activation'.

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Similar questions

Refer to the given graph showing the relationship between temperature and enzyme action.

Select the correct statement regarding 'A' and 'B'.
(i) 'A' shows' rate at which reaction decreases due to denaturation of enzyme molecules.
(ii) 'B' shows the rate at which reaction increases due to decreased kinetic energy of the substrate.
(iii) As temperature rises, more and more enzyme molecules are denatured and 'A' appears to fall.
(iv) 'B' shows the rate at which reaction increases due to an increased kinetic energy of substrate and enzyme molecules.

Q. The figure given above shows the conversion of a substrate into produced by an enzyme. In which one of the four option (1-4), the components of reaction labelled as A, B, C and D are identified correctly.

	A	B	C	D
1	Activation energy with enzyme	Transition state	Activation energy without enzyme	Potential energy
2	Potential energy	Transition state	Activation energy with enzyme	Activation energy without enzyme
3	Transition state	Potential energy	Activation energy without enzyme	Activation energy with enzyme
4	Potential energy	Transition state	Activation energy with enzyme	Activation energy without enzyme

Q. Read the following four statements (A-D):-
(A) Thermal stability is an important quality of enzymes which are isolated from thermophilic organisms.
(B) Formation of Enzymes substrate complex, during enzymatic reaction, is an facultative phenomenon.
(C) Enzymes bring down the energy barrier between substrate and transition state to make the transition of substrate to product easy.
(D) The essential chemical components of many coenzymes are proteins and vitamins.
How many of the given statements are right?

Q. Energy released from enzyme-substrate interaction is

Q. Arrange the steps of catalytic action of an enzyme in order and choose the right option.

(i)

Enzyme releases products of reaction and the enzyme is free to bind to another substrate.

(i i)

Active site of enzyme is in close proximity of substrate and breaks the chemical bonds of substrate.

(i i i)

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

(i v)

Substrate binds to active site of enzyme fitting into active site.

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