Understanding Enzymes and Reactions

What is the primary role of enzymes in biological reactions?

• To increase the temperature of the reaction

• To lower the activation energy required for the reaction

• To act as a reactant in the reaction

• To change the products of the reaction

Which of the following factors does NOT affect enzyme activity?

• Temperature

• pH level

• Substrate concentration

• Color of the enzyme

What is the effect of a competitive inhibitor on enzyme activity?

• It binds to the active site, preventing substrate binding

• It changes the shape of the enzyme permanently

• It increases the enzyme's activity

• It binds to a site other than the active site

How does temperature generally affect the rate of enzyme-catalyzed reactions?

• Increasing temperature always decreases the reaction rate

• Increasing temperature always increases the reaction rate

• Increasing temperature increases the reaction rate up to a point, then decreases it

• Temperature has no effect on enzyme activity

What is activation energy?

• The energy required to start a reaction

• The energy released by a reaction

• The energy stored in the products of a reaction

• The energy used to break down enzymes

Tags

NGSS.HS-PS1-5

Which of the following best describes the effect of pH on enzyme activity?

• Enzymes are not affected by pH

• Each enzyme has an optimal pH range where it functions best

• All enzymes work best at a pH of 7

• Enzymes are only active in acidic environments

What happens to an enzyme when it is denatured?

• It becomes more active

• It loses its specific shape and function

• It becomes a substrate

• It speeds up the reaction

Which of the following is an example of a non-competitive inhibitor?

• A molecule that binds to the active site

• A molecule that binds to a site other than the active site, altering enzyme function

• A molecule that increases substrate concentration

• A molecule that acts as a substrate