Factors affecting enzyme activity

Select the factors which can affect enzyme activity.

• pH only

• temperature only

• substrate concentration only

• pH, temperature and substrate concentration

Select the true statement.

• Enzymes work well in any pH.

• Enzymes work best away from their optimum pH.

• Enzymes work best at a an optimum pH.

• pH has no effect on enzyme activity.

Select the true statement.

• All enzymes have the same optimum pH.

• Different enzymes have a different optimum pH.

• All enzymes work best in acidic conditions.

• All enzymes work best in alkaline conditions.

Select the true statement.

• The optimum pH for pepsin is 2.

• The optimum pH for amylase is 7.

• The optimum pH for pepsin is 3.

• The optimum pH for amylase is 5.

Select the true statement.

• Enzymes decouple at pH levels far away from their optimum.

• Enzymes deactivate at pH levels far away from their optimum.

• Enzymes denature at pH levels far away from their optimum.

• Enzymes decompose at pH levels far away from their optimum.

Select the correct statement.

• As temperature increases, enzyme activity increases,

• As temperature increases enzyme activity increases up to an optimum temperature.

• As temperature increases enzyme activity increases beyond an optimum temperature.

• As temperature increases enzyme activity decreases.

Select the correct explanation.

• Enzymes denature at an optimum temperature.

• Temperature has no effect on enzyme structure.

• Below an optimum temperature enzymes will denature.

• Above an optimum temperature enzymes will denature.

Select the correct explanation.

• As temperature increases the kinetic energy of enzymes and substrate molecules stays the same.

• As temperature increases the kinetic energy of enzymes and substrate molecules increases.

• As temperature increases the kinetic energy of enzymes and substrate molecules decreases.

Select the correct conclusion.

• As substrate concentration increases the rate of reaction increases.

• As substrate concentration increases the rate of reaction increases up to an optimum.

• As substrate concentration increases the rate of reaction decreases.

• As substrate concentration increases the rate of reaction stays the same.

Select the correct explanation.

• Beyond an optimum substrate concentration all the enzyme's active sites are open.

• Beyond an optimum substrate concentration all the enzyme's active sites denature.

• Beyond an optimum substrate concentration all the enzyme's active sites are empty.

• Beyond an optimum substrate concentration all the enzyme's active sites are full.