AP/SUPA - Chapter 8: Metabolism, Energy and Enzymes

Front

What happens to an enzyme when it is denatured?

Back

It loses its shape.

Front

What is the optimum pH of an enzyme if its activity is greatest around pH 6.6?

Back

The optimum pH of the enzyme is 6.6.

Front

Is the reaction that releases energy classified as endergonic or exergonic?

Back

Exergonic.

Front

What effect do low temperatures have on enzymatic activity?

Back

Low temperatures mean molecules are moving slower and so reaction rate is low.

Front

What is the role of an enzyme in a biochemical reaction?

Back

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

Front

Define activation energy.

Back

Activation energy is the minimum energy required for a chemical reaction to occur.

Front

What is the active site of an enzyme?

Back

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

Front

How do competitive inhibitors affect enzyme activity?

Back

Competitive inhibitors bind to the active site, preventing substrate from binding and decreasing enzyme activity.

Front

What is the difference between an endergonic and exergonic reaction?

Back

Endergonic reactions absorb energy, while exergonic reactions release energy.

Front

What happens to enzyme activity at high temperatures?

Back

High temperatures can denature enzymes, leading to a loss of activity.