AQA - Biology - Factors effecting enzyme

How does temperature generally affect enzyme activity?

• Enzyme activity decreases as temperature increases.

• Enzyme activity increases with temperature up to an optimum point.

• Enzyme activity is not affected by temperature.

• Enzyme activity is highest at freezing temperatures.

What happens to an enzyme when the temperature exceeds its optimum level?

• The enzyme becomes more efficient.

• The enzyme denatures and loses its function.

• The enzyme's activity remains constant.

• The enzyme becomes inactive but can be reactivated by cooling.

Which pH level is most likely to denature an enzyme that works best at pH 7?

• pH 2

• pH 7

• pH 8

• pH 6

How does substrate concentration affect enzyme activity?

• Enzyme activity decreases as substrate concentration increases.

• Enzyme activity increases with substrate concentration until it reaches a saturation point.

• Enzyme activity is not affected by substrate concentration.

• Enzyme activity is highest at low substrate concentrations.

What is the term used to describe the loss of enzyme activity due to high temperatures?

• Inhibition

• Denaturation

• Activation

• Catalysis

At what temperature range do most human enzymes function optimally?

• 0-10°C

• 20-30°C

• 35-40°C

• 50-60°C

Which of the following is true about enzyme activity at extreme pH levels?

• Enzyme activity increases.

• Enzyme activity decreases.

• Enzyme activity remains unchanged.

• Enzyme activity is highest.

What is the effect of increasing substrate concentration on enzyme activity when all active sites are occupied?

• Enzyme activity will continue to increase.

• Enzyme activity will decrease.

• Enzyme activity will remain the same.

• Enzyme activity will stop completely.