Exploring Enzymes in AP Biology Unit 3

This video is an AP Biology review session focusing on unit 3, cellular energetics. It covers the role of enzymes in biological reactions, their structure, and how they function. The video explains how environmental factors like temperature and pH affect enzyme activity and discusses enzyme inhibitors. A lab experiment using turnips and guaiacol is described to illustrate enzyme activity. The session concludes with a preview of the next topic on cellular energy, photosynthesis, and cellular respiration.

What is the primary focus of the first three parts of Unit 3 in AP Biology?

• Photosynthesis

• Cellular Respiration

• Enzymes

• DNA Replication

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NGSS.HS-LS1-5

NGSS.HS-LS1-7

What is the significance of the active site in an enzyme?

• It determines the enzyme's solubility.

• It is where the substrate binds and the reaction occurs.

• It is responsible for the enzyme's color.

• It stores the enzyme's genetic information.

How do enzymes affect activation energy?

• They increase the activation energy required for a reaction.

• They decrease the activation energy required for a reaction.

• They have no effect on activation energy.

• They eliminate the need for activation energy.

Tags

NGSS.HS-LS1-7

What happens to an enzyme when it denatures?

• It doubles its reaction rate.

• It becomes more stable.

• It becomes more active.

• It changes shape and loses its function.

Which environmental factor is NOT a major cause of enzyme denaturation?

• Substrate concentration

• Salt concentration

• pH

• Temperature

What is the optimal pH for the enzyme amylase?

• 5

• 9

• 2

• 7

How does a competitive inhibitor affect an enzyme?

• It changes the enzyme's shape permanently.

• It binds to the active site and blocks the substrate.

• It binds to the allosteric site.

• It increases the enzyme's activity.

What is the effect of a non-competitive inhibitor on an enzyme?

• It increases the enzyme's activity.

• It binds to a different site and changes the enzyme's shape.

• It binds to the active site and blocks the substrate.

• It has no effect on the enzyme.

In the enzyme lab experiment, what was used to measure enzyme activity?

• The change in pH

• The amount of hydrogen peroxide produced

• The amount of oxygen produced

• The change in temperature

What was the purpose of using guaiacol in the enzyme lab experiment?

• To denature the enzyme

• To increase the temperature

• To change the pH

• To measure the amount of oxygen produced