Question

one model of enzymes describes it as a \lock and a key.\ this is because the enzyme and substrate fit together in order to work. if the temperature is too high, an enzyme can become denatured, and it changes shape. how would this affect its activity?

it changes the enzymes shape, preventing it from binding to its substrate.

it increases the enzymes activity by altering its structure.

it breaks the enzyme into smaller molecules, rendering it ineffective.

Explanation:

Enzymes work based on a specific shape - substrate fit. High temperatures cause denaturation, altering the enzyme's shape. This change prevents the enzyme - substrate binding, reducing enzyme activity.

Answer:

It changes the enzyme's shape, preventing it from binding to its substrate.