Class 11 Biology · Chapter 5 · Test 3
Enzymes Part 3
37 MCQs This set covers the significance of enzyme inhibition and feedback inhibition. It also covers the classification of enzymes by the reactions they catalyse and by the substrates they use.
36 questions · 25 min · 36 marks
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Sample questions
The first 5 of 36. Try each one, then tap to see the answer.
Question 1
Enzyme inhibition helps cells to
- ARegulate metabolic pathways
- BStop all reactions
- CMake more enzymes
- DRemove water
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Answer: A
By inhibiting specific enzymes the rate of a reaction can be controlled.
Question 2
Anticoagulants work by inhibiting enzymes of
- ADigestion
- BBlood clotting
- CRespiration
- DPhotosynthesis
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Answer: B
Some inhibitors of clotting enzymes are used as anticoagulants.
Question 3
Some cancer drugs work by inhibiting enzymes involved in
- ACell division
- BDigestion
- CVision
- DBlood clotting
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Answer: A
Many drugs act as enzyme inhibitors.
Question 4
Reversible inhibition can be overcome by
- AIncreasing substrate concentration
- BDecreasing substrate concentration
- CHeating strongly
- DAdding more inhibitor
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Answer: A
Reversible inhibitors can be released and their effect neutralized.
Question 5
Irreversible inhibitors cannot be released by
- ADilution or dialysis
- BNothing
- CWater only
- DHeat only
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Answer: A
They form covalent bonds with the enzyme.
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