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Assertion (A) Enzymes lower down the activation energy of the reactant molecule to make its transition into product easier. Reason (R) Enzymes are highly substrate specific catalysts.

A
Both and are true and is the correct explanation of

B
Both and R are true, but is not the correct explanation of

C
is true, but is false

D
is false, but is true

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Both and are true, but is not the correct explanation of .
Enzymes are able to lower the activation of the reactant molecule by binding to and placing the substrate in close proximity to other substrates and catalytic groups, so that less energy is required to enable interaction between them.
Another way is that enzymes may provide charged side groups in their amino acid structure to help stabilise transition states between the initial and final products.
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Practice questions from CBSE New Pattern Biology Class 11 for 2021-22 Exam MCQs based book for Term 1

Question 3
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Direction: Read the following and answer the questions that follow Enzymes are organic macromolecules which are mostly proteinaceous in nature with few exceptions. These are water soluble compounds and required for catalysing biochemical reactions in living cells. They are highly specific and efficient in very small amounts. Each enzyme has a substrate binding site in order to bind and forms complex with a specific substrate. Few compounds closely resemble substrate and can inhibit the activity of enzyme. These are known to function under specific temperature, and substrate concentration. (i) The enzymes that catalyse the hydrolysis of ester bonds are : (a) hydrolases (b) lyases (c) transferases (d) ligases (ii) A competitive inhibitor of enzyme is: (a) penicillin (b) malonate (c) cyclosporin (d) Both (b) and (c) (iii) The factor that activates the activity of enzymes are: (a) (b) (c) (d) All of these (iv) Lyases are the enzymes which catalyse: (a) cleavage of covalent bonds (b) formation of bonds with ATP cleavage (c) transfer of functional group (d) Both (a) and (b) Identify the correct conclusions about the graph shown above: I. At optimum temperature, enzyme activity is maximum. II. At low temperature, the enzyme is inactives. III. At high temperature, enzymes get denatured. Codes (a) Only I (b) Only III (c)Only II (d) I, II and III
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Question Text
Assertion (A) Enzymes lower down the activation energy of the reactant molecule to make its transition into product easier. Reason (R) Enzymes are highly substrate specific catalysts.
TopicBiomolecules
SubjectBiology
ClassClass 11
Answer TypeText solution:1
Upvotes50