Enzymes HW

The primary function of an enzyme or any biological catalyst is to

reduce the energy of activation and increase the rate of a reaction.

_________ can change the active site of an enzyme and alter its function.

temperature and pH

Temperature, pH, and ionic concentrations play an important role in the proper functioning of enzymes.

true

The shape of an enzyme determines its function.

true

How can you determine the optimum pH of an enzyme?

Test the enzyme at different pH levels.

Imagine that you are observing an enzyme-catalyzed reaction in lab. Every time you add more enzyme, the reaction rate increases proportionally until the reaction rate suddenly levels off. No other chemicals were added, and no modifications were made in the experimental setting. Why do you think the reaction rate stopped increasing?

The molecules of substrate were all bound to enzyme.

Which of the following statements about enzymes is FALSE?

The substrate binds to the enzyme with low specificity.

Enzymes have which of the following characteristics? (Select all that apply)

They are proteins. They can bind with substrate. They act as catalysts.

The substrate binds at the enzyme's

active site

When you boil egg white (albumin is protein) you have

denatured the protein.

Without undergoing any changes itself, the _____ makes changes to the ______.

enzyme; substrate

Enzymes are consumed in chemical reactions and must therefore be replenished.

false

The active site is located on the substrate.

false

The active site of an enzyme (Select all that apply)

is the part that binds to the substrate. changes to conform to the substrate.

The optimum condition for an enzyme

is where it works best.

How often can a catalase molecule be used to hydrolyze hydrogen peroxide?

many times

Consider the biochemical pathway below, where A, B, and C are substrates and products and E1 and E2 are the enzymes that catalyze the reactions. Enzyme 1 (E1) can utilize

only A as substrate.

What may affect the rate of an enzyme-driven reaction? (Select all that apply.)

pH temperature concentration of enzyme concentration of substrate

Altering the three-dimensional structure of an enzyme might

prevent the substrate from binding the enzyme's active site.

Consider the biochemical pathway below, where A, B, and C are substrates and products and E1 and E2 are the enzymes that catalyze the reactions. If Enzyme 1 (E1) is inactive, which of the following compounds will accumulate?

A only