According to the Lock-and-Key model, the active site has a:

Continuously changing structure

Class 9 Biology · Chapter 7 · Test 3

Mechanism of Enzyme Action

25 MCQs on active sites, enzyme-substrate complexes, the Lock-and-Key model, the Induced Fit model, temperature, pH, substrate concentration, optimum conditions, and enzyme activity.

MCQs

25 questions · 20 min · 25 marks

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Sample questions

The first 5 of 25. Try each one, then tap to see the answer.

Question 1
The pockets or clefts on the surface of an enzyme are called:
- AActive sites
- BCofactors
- CSubstrates
- DProducts
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Answer: A
The textbook states that pockets or clefts on an enzyme surface are called active sites.
Question 2
The active site of an enzyme is directly involved in:
- ACatalysis
- BProtein storage
- CDNA replication
- DCell division
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Answer: A
The textbook states that active sites are directly involved in catalysis.
Question 3
The molecules that bind to the active site are called:
- ASubstrates
- BCofactors
- CInhibitors
- DProducts
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Answer: A
The textbook identifies the molecules undergoing enzyme-controlled reactions as substrates.
Question 4
The Lock-and-Key model of enzyme action was proposed by:
- AEmil Fischer
- BDavid?
- CWatson
- DCrick
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Answer: A
The textbook states that Emil Fischer proposed the Lock-and-Key model in 1894.
Question 5
According to the Lock-and-Key model, the active site has a:
- AFixed structure
- BContinuously changing structure
- CRandom structure
- DDouble-stranded structure
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Answer: A
The textbook states that the Lock-and-Key model considers the active site to have a fixed structure.

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