Campbell 8.4/8.5 Quiz

Which of the following is NOT true of enzymes?

• they act as catalysts

• they lower activation energy

• they are exclusively proteins

• they aren't consumed in reactions

Consider the following events:

I. The molecule reaches an unstable state.

II. Energy leaves the reaction.

III. Energy is added to the reaction.

IV. The molecule reaches a stable state again.

Which of the following sequences best describes the chronological order of events in an enzyme-catalyzed reaction, from first to last?

• II --> I --> III --> IV

• III --> I --> II --> IV

• IV --> III --> I --> II

• IV --> II --> I --> III

Activation energy is most often supplied as ____ energy.

• kinetic

• chemical

• thermal

• potential

Why do proteins and DNA not spontaneously decompose?

• Proteins and DNA are too large to decompose.
• They are protected by a thick membrane.
• They cannot easily overcome the activation energy barrier.

• They are incapable of spontaneously decomposing.

Tags

NGSS.HS-PS1-5

Enzymes ____ and ____ in reactions.

• are specific; are consumed

• are specific; are not consumed

• are not specific; are consumed

• are not specific; are not consumed

The ____ is a temporary molecule formed by the bonding of a substance to an enzyme.

• enzyme-catalyst complex
• substrate

• enzyme-product complex
• enzyme-substrate complex

What is the active site of an enzyme?

• The active site is where the enzyme is produced.
• The active site is the location where regulators always attach.

• The active site is the region where amino acids are stored.

• The active site of an enzyme is the region where catalysis occurs.

Substrate is held to the active site by ____ bonds.

• weak

• covalent

• ionic

• peptide

In induced fit, the ____ changes shape, causing the substrate to ____ in the active site.

• enzyme as a whole; fit snugly

• enzyme as a whole; stop fitting

• active site; fit snugly

• active site; stop fitting

Catalysis tends towards:

• higher activation energy

• higher free energy

• equilibrium

• disorder