Enzymes speed up chemical reactions.

Enzymes slow down chemical reactions.

Enzymes create energy from food.

Where to the substrates bind on the enzyme?

The substrate binds to the enzyme's surface.

The substrate binds in the enzyme's allosteric site.

The substrate binds to the enzyme's cofactor.

What does binding with the enzyme do to the bonds in the substrate(s)?

Binding with the enzyme weakens the bonds in the substrate(s).

Binding with the enzyme breaks the bonds in the substrate(s).

Binding with the enzyme has no effect on the bonds in the substrate(s).

Binding with the enzyme strengthens the bonds in the substrate(s).

What happens because of the chemical reactions that occur on the active site?

Active sites are responsible for energy production.

Chemical reactions occur only in the absence of enzymes.

Enzymes break down products into substrates.

What is the active site on an enzyme?

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

The active site is the region where enzymes are stored.

The active site is the part of the enzyme that determines its shape.

The active site is where the enzyme is produced.

What is the substrate in an enzyme driven reaction?

The substrate is the molecule that an enzyme acts upon.

The substrate is the energy source for the enzyme.

The substrate is a byproduct of the enzyme's action.

The substrate is the enzyme that catalyzes the reaction.

What is activation energy?

Activation energy is the minimum energy needed for a reaction to occur.

The energy required to break chemical bonds.

The total energy of the reactants.

The energy released during a reaction.

What do enzymes do to the activation energy of a reaction?

Enzymes decrease the activation energy of a reaction.

Enzymes increase the activation energy of a reaction.

Enzymes have no effect on the activation energy of a reaction.

Enzymes eliminate the activation energy of a reaction.

Label the graph showing which line represents the activation energy with or without an enzyme.

activation energy WITHOUT enzyme

The graphs show the reaction rate for an enzyme across a range of temperatures and pH. Based on these data, this enzyme functions best as what temperature and pH?

Temperature of 37oC and a pH of 6

Temperature of 27oC and a pH of 4

Temperature of 40oC and a pH of 8

Temperature of 50oC and a pH of 10

How does increasing the amount of enzyme or substrate affect the rate of reaction?

Increasing enzyme concentration increases reaction rate until saturation; increasing substrate concentration increases rate until all enzymes are saturated.

Increasing substrate concentration has no effect on reaction rate.

Both enzyme and substrate concentrations must be decreased to increase reaction rate.

Increasing enzyme concentration decreases reaction rate.

How does an inhibitor slow down a chemical reaction?

It blocks or distorts the active site

increases the concentration of reactants in a chemical reaction.

An inhibitor has no effect on the rate of a chemical reaction.

An inhibitor speeds up a chemical reaction by enhancing enzyme activity.

*Enzymes

Interactive Video

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Science

•

9th - 12th Grade

•

Practice Problem

•

Hard

Dorothy Burford

FREE Resource

45 questions

Show all answers

SLIDE QUESTION

30 sec • Ungraded

SLIDE QUESTION

30 sec • Ungraded

SLIDE QUESTION

30 sec • Ungraded

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why do living organisms need enzymes?

Enzymes are used to store energy in cells.

Enzymes are harmful to living organisms.

Enzymes are only needed in plants.

Living organisms need enzymes to speed up chemical reactions necessary for life.

SLIDE QUESTION

30 sec • Ungraded

SLIDE QUESTION

30 sec • Ungraded

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the reactant in a chemical reaction?

Products formed after the reaction

Catalysts that speed up the reaction

Byproducts that are created during the reaction

Reactants are the starting substances in a chemical reaction.

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