If an enzyme becomes over heated what effect, if any, will the heat have on the enzymatic activity?

The enzyme will not be able to catalyze reactions.

The enzyme will not store much chemical energy.

The enzyme will lose its net electrical charge.

The enzyme will lose stored genetic information.

What is the purpose of an enzyme?

give permission for the reaction

control how many reactions occur

An enzyme speeds up a reaction by

lowering the activation energy.

When a piece of liver is dropped into hydrogen peroxide, the peroxide bubbles vigorously as the hydrogen peroxide (H 2 O 2 ) decomposes into water (H 2 O) and oxygen (O 2 ). This rapid change in reaction rate suggests

the liver contains an enzyme that breaks down hydrogen peroxide

that liver contains lots of germs

that liver is a substrate for hydrogen peroxide

that hydrogen peroxide is a powerful enzyme

The diagram represents one way an enzyme can be inhibited. (View Image) Which statement explains the effect of an inhibitor on an enzyme?

A substrate will be unable to attach to the enzyme.

A substrate will be able to bond with the enzyme.

The enzyme will likely be attacked by immune cells.

The enzyme will be unable to produce more enzymes.

Enzymes are capable of increasing the rate of a chemical reaction within a living cell. Enzymes accomplish this through which of the following means?

reducing the number of products

increasing the temperature of the cell

increasing the concentration of reactants

At high temperatures enzyme activity declines because of:

Dissociation of Ionic Compounds

Which of the following correctly describes how enzymes work?

they lower the activation energy of the reaction to increase the rxn rate

they lower the energy of the reactants to increase the rxn rate

they supply energy to the reaction to increase the rxn rate

they lower the energy of the products to increase the rxn rate

What happens when enzymes are heated to a high temperature?

The shapes of the enzyme are altered or denatured

The enzymes' amino acid sequence changes.

Fireflies emit light. The production of light by an organism is called bioluminescence. To generate visible light, cells in a firefly’s tail produce thousands of luciferase enzymes. Luciferase binds to a chemical called luciferin. Once bound, the luciferase enzyme speeds up a chemical reaction that combines an oxygen molecule and luciferin to produce oxyluciferin. This reaction requires energy and releases light. Which of the following best describes how the luciferase enzyme speeds up the chemical reaction?

Luciferase decreases the amount of energy required for the reaction to start.

Luciferase increases the amount of time the light is visible.

Luciferase increases the number of sites on luciferin that must bind to oxygen.

Luciferase decreases the temperature of the environment inside the body of the firefly.

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 do competitive inhibitors affect enzymes?

It binds to the active site, blocking the substrate

It changes the shape of the enzyme

It increases the activation energy

It decreases the activation energy

How do non-competitive inhibitors affect enzymes?

It changes the shape of the enzyme

It binds to the active site, blocking the substrate

It increases the activation energy

It decreases the activation energy

Enzyme Practice Quiz: 50 Practice Questions (Grade 9)

50 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Enzymes are...

Nucleic Acids

Proteins

Lipids

Carbohydrates

2.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Which of the following binds to an active site of an enzyme?

Substrate

Product

Codon

None of these

3.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

An enzyme speeds up a chemical reaction in the cell, but can only be used once.

True

False

4.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Enzymes speed up a chemical reaction by...

destroying products

lowering activation energy

increasing activation energy

allowing reactions to process at their own speed

5.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Which substrate would this enzyme catalyze?

Δ

σ

∅

μ

6.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

An enzyme and its substrates are often referred to a ________________________ shape.

misfit

fan & air

balloon & string

lock & key

7.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Any substrate that is acted upon by an enzyme is called a(n)

substrate

reactant

nucleic acid

both a & b

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Enzyme Practice

Enzymes are...

Which of the following binds to an active site of an enzyme?

An enzyme speeds up a chemical reaction in the cell, but can only be used once.

Enzymes speed up a chemical reaction by...

Which substrate would this enzyme catalyze?

An enzyme and its substrates are often referred to a ________________________ shape.

Any substrate that is acted upon by an enzyme is called a(n)

Based on the graph, what temperature does this enzyme work best?

In the diagram, what is letter E?

What factors affect an enzyme's reaction rate?

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