AQA - Required practical - Biology - Enzyme activity

Which of the following factors does NOT affect enzyme activity?

• Temperature

• pH

• Substrate concentration

• Light intensity

What is the optimal temperature range for most human enzymes?

• 0-10°C

• 20-30°C

• 35-40°C

• 50-60°C

How does a very high temperature affect enzyme activity?

• Increases activity

• Decreases activity

• Denatures the enzyme

• No effect

What happens to enzyme activity when the pH is far from the enzyme's optimal pH?

• Activity increases

• Activity decreases

• Enzyme becomes more stable

• No change in activity

Which of the following is a common method for measuring enzyme activity?

• Measuring the change in colour of a solution

• Measuring the change in temperature

• Measuring the change in pH

• Measuring the change in light intensity

What is the effect of increasing substrate concentration on enzyme activity, assuming enzyme concentration is constant?

• Activity decreases

• Activity increases and then levels off

• Activity remains constant

• Activity decreases and then increases

Which of the following best describes the term "denaturation" in the context of enzymes?

• The enzyme becomes more active

• The enzyme's structure is altered, losing its function

• The enzyme's pH is increased

• The enzyme's temperature is decreased

What is the effect of pH on enzyme activity?

• Enzyme activity is highest at extreme pH levels

• Enzyme activity is unaffected by pH

• Each enzyme has an optimal pH at which it is most active

• Enzyme activity decreases as pH increases