Class 11 Biology · Chapter 5 · Test 2
Enzymes Part 2
45 MCQs This set covers the effect of temperature, pH, enzyme concentration and substrate concentration on enzyme activity. It also covers enzyme inhibition, including competitive and non-competitive and reversible and irreversible inhibitors.
45 questions · 30 min · 45 marks
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Sample questions
The first 5 of 45. Try each one, then tap to see the answer.
Question 1
The optimum temperature for human enzymes is
- A25 C
- B37 C
- C50 C
- D70 C
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Answer: B
Every enzyme works at its maximum rate at its optimum temperature.
Question 2
The shape of a protein is determined by
- AHydrogen bonds and hydrophobic interactions
- BOnly peptide bonds
- COnly ionic bonds
- DGlycosidic bonds
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Answer: A
Both are easily disrupted by slight changes in temperature.
Question 3
Below the optimum temperature the reaction rate is slow because
- ABonds become less flexible and prevent induced change in the active site
- BEnzymes are denatured
- CSubstrate is destroyed
- DEnzymes are used up
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Answer: A
Low temperature reduces flexibility of the enzyme shape.
Question 4
Raising temperature up to a limit increases the reaction rate because
- AMolecules move faster and collide more often
- BEnzymes multiply
- CWater is removed
- DSubstrate decreases
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Answer: A
Heat provides kinetic energy to substrate and enzyme molecules.
Question 5
Violent vibrations of atoms at high temperature cause
- ADenaturation of the enzyme
- BFaster catalysis
- CFormation of coenzymes
- DMore substrate binding
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Answer: A
Bonds can no longer hold the polypeptide chains in position.
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