Enzyme True/False Quiz

Enzymes are consumed during chemical reactions.

• True

• False

Answer explanation

Enzymes are not consumed in the reaction; they can be reused.

Enzymes work best at extreme temperatures and pH levels.

• True

• False

Answer explanation

1. Enzymes typically function under mild conditions, such as neutral pH and moderate temperatures.

Lock-and-key and induced-fit models explain enzyme-substrate interactions.

• True

• False

An enzyme's active site is a rigid structure that never changes.

• True

• False

Answer explanation

1. The induced-fit model suggests the active site can change to fit the substrate.

Enzymes increase the energy requirement for a reaction.

• True

• False

Answer explanation

Enzymes lower the activation energy for reactions.

Cofactors are always metal ions.

• True

• False

Answer explanation

1. Cofactors can be metal ions or organic molecules (coenzymes).

Apoenzymes are active forms of enzymes.

• True

• False

Answer explanation

1. Apoenzymes are inactive until they bind to a cofactor.

Holoenzymes consist of an apoenzyme and a cofactor.

• True

• False

Metal ions can stabilize negative charges in enzyme catalysis.

• True

• False

Enzymes have specificity for their substrates.

• True

• False