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Biomolecules MCQs for NEET — Zoology Questions with Answers

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Which of the following is incorrect?

Enzymatic activity is maximum at its optimim p^H and temperature.

Enzymatic activity declines both below and above the optimum value.

Low temperatures destroys enzymatic activity

High temperatures destroys enzymatic activity

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Explanation

Refer NCERT, Heading 9.12.4, page-157 and 158

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Which of the following destroys the Enzymatic activity?

high temperature

low temperature

p^H

Both B and C

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Explanation

Refer NCERT, Heading 9.12.4, page-157 and 158

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Which of the following factors can influence enzyme activity?

High temperature

p^H

Substrate concentration

All of these

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Explanation

Refer NCERT, Heading 9.12.4, page-157

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Which of the following is true for competitive inhibition?

K_m decreases but V_max increases

K_m increases but V_max decreases

K_m increases but V_max remains same

K_m decreases but V_max remains same

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Explanation

Refer NCERT, Heading 9.12.4, page-157 and 158, K_m increases but V_max remains same in case of competitive inhibition

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What would happen to K_m, in presence of a competitive inhibitor?

Increase

Decrease

remains constant

First increases then decreases

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Explanation

Refer NCERT, Heading 9.12.4, page-157 and 158, In case of competitive inhibition K_m increases

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What would happen to V_max, in presence of a competitive inhibitor?

Increase

Decrease

remains constant

First increases then decreases

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Explanation

Refer NCERT, Heading 9.12.4, page-157 and 158, V_max remains the same in case of competitive inhibition

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The substrate of enzyme succinic dehydrogenase is

succinate

malonate

malate

mannose

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Explanation

Refer NCERT, Heading 9.12.4, page-157 and 158

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The competitive inhibitor of enzyme succinic dehydrogenase is

succinate

malonate

malate

mannose

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Explanation

Refer NCERT, Heading 9.12.4, page-157 and 158

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k_m(Michaelis constant) value of enzyme is the substrate concentration at which velocity of reaction

V_max

one fourth of V_max

One third of V_max

half of V_max

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Explanation

Refer NCERT, Heading 9.12.4, page-157 and 158

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Which of the following in not an example of competitive inhibition?

Inhibition of succinic dehydrogenase by malonate

Inhibition of bacterial pathogens by sulpha drugs

Inhibition of alcohol dehydrogenase by ethanol in case of methanol poisoning

Inhibition of hexokinase by glucose-6-phosphate

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Explanation

Refer NCERT, Heading 9.12.4, page-157 and 158, Inhibition of hexokinase by Glucose-6- phosphate is done by Feedback inhibition.

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