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IGCSE Enzymes

Authored by Volder Soares

Biology

9th - 12th Grade

Used 78+ times

IGCSE Enzymes
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20 questions

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1.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Which statement is true about enzymes?

The enzyme's active site protects the shape of the substrate

Enzymes are used up in biological reactions

Enzymes work faster at higher temperatures

Every enzyme has one specific substrate that it breaks down or builds up.

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following factors would not affect the rate of an enzyme-controlled reaction?

Temperature

pH

Concentration of enzyme

Concentration of product

Concentration of substrate

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Media Image

The graph shows the effect of temperature on an enzyme. Which statement explains the trend from 10-70oC?

As temperature increases, enzyme activity increases

70oC is the optimum temperature for this enzyme

As temperature increases, enzymes become denatured.

As temperature increases, enzyme activity decreases.

As temperature increases, molecules gain more kinetic energy and have more successful collisions

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does the term optimum mean for enzyme temperature? Select the best description.

The lowest temperature at which the enzyme works to form enzyme-substrate complexes

The temperature which gives the highest enzyme activity forming the maximum number of enzyme-substrate complexes

The highest temperature before denaturing occurs

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of these statements about enzymes is true?

Temperature does not affect their activity

They can't be reused

They lower the activation energy of a reaction

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which statement about the optimum pH for an enzyme is correct?

It is the pH at which the enzyme's activity is greatest with the maximum number of enzyme-substrate complexes being formed

It is the same for all enzymes

It is the pH at which the enzyme cannot be damaged by heat

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the purpose  of an enzyme?

give permission for the reaction
raise activation energy
speed up reactions
control how many reactions occur

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