Unit 3 AP Biology Insta-Review (Cellular Energetics)

Front

What happens to the reaction rate if the enzyme is denatured?

Back

The reaction rate decreases.

Front

What occurs when a substrate binds to an enzyme?

Back

The enzyme changes shape.

Front

Where does the Krebs Cycle occur within the cell?

Back

In the matrix of the mitochondria.

Front

What characterizes an endergonic reaction?

Back

It has a positive ΔG and is nonspontaneous.

Front

What characterizes an exergonic reaction?

Back

It has a negative ΔG and is spontaneous.

Front

What is the role of enzymes in biochemical reactions?

Back

Enzymes act as catalysts to speed up reactions by lowering the activation energy.

Front

What is activation energy?

Back

The minimum energy required for a chemical reaction to occur.

Front

What is the difference between competitive and non-competitive inhibition?

Back

Competitive inhibition occurs when an inhibitor competes with the substrate for the active site, while non-competitive inhibition occurs when an inhibitor binds to an allosteric site, changing the enzyme's shape.

Front

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

Back

The active site is the region where substrate molecules bind and undergo a chemical reaction.

Front

How does temperature affect enzyme activity?

Back

Enzyme activity typically increases with temperature up to an optimal point, after which it may decrease due to denaturation.