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Home /
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MDCAT Past Papers /
UHS /
Biology /
Chap No 3 /
2025 /
Quiz 1

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MDCAT Past Papers - UHS - Biology - Chap No 3 - 2025 Quiz

Attempt 10 MCQs on MDCAT Past Papers - UHS - Biology - Chap No 3 (Year 2025) | Quiz 1

1. Enzymes activity decreases at very low or high pH because:

Substrate concentration increases
Enzymes become denatured
Product formation increases
Temperature becomes constant

2. Enzymes belong to which class of biomolecules?

Carbohydrates
Lipids
Proteins
Nucleic acids

3. Effect of increased substrate concentration on enzyme activity:

Decrease the rate of reaction
Increase the reaction rate until all active sites are saturated
Have no effect on the reaction rate
Increase the reaction rate in a straight diagonal line

4. According to Lock and Key model, the active site is regarded as:

Rigid and specific
Flexible and specific
Rigid and non specific
Flexible and non specific

5. Reversible inhibitors differ from irreversible inhibitors because they:

Binds permanently and cannot be removed
Bind temporarily and can be removed
Permanently inactivate the enzyme
Change enzyme structure permanently

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