Which of the following environmental changes could denature an enzyme?

too high a concentration of substrate

too high a concentration of enzyme

too low a concentration of substrate

lowering the amount of energy needed for a chemical reaction

providing energy to a chemical reaction

removing energy from a chemical reaction

eliminating the need for energy in a chemical reaction

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

The diagram represents one way an enzyme can be inhibited. 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.

When a piece of liver is dropped into hydrogen peroxide, the peroxide will form bubbles vigorously as a result of what reaction?

Peroxide being broken into water and oxygen.

Peroxide destroying the bacteria in the liver.

Additional peroxide created by the liver once the initial peroxide is added.

Bacteria cells exploding as peroxide dissolves their cell membranes.

Liver cells decomposing to produce carbon dioxide.

What happens to the rate of reaction in a test tube when a competitive inhibitor is added?

The reaction slows down because the competitive inhibitor binds to the enzyme

The reaction speeds up because the competitive inhibitor helps the enzyme

The reaction rate speeds up because the enzyme’s shape is changed

There is no impact on the reaction rate because the inhibitor is competitive

The reaction slows down because the enzyme’s shape is changed

Endergonic reactions are _____________; exergonic reactions are ____________

non-spontaneous; non-spontaneous

a specific substrate in which they act upon

AP Bio Module 14: Enzymes

Authored by Michelle Bibel

Biology

11th - 12th Grade

NGSS covered

Used 248+ times

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following lowers the activation energy of reactions in biological systems?

cellulose

glycogen

enzymes

triglycerides

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is being represented by the letter B in the image?

Substrate

Enzyme

Substrate

Product

What is being represented by the letter A in the image?

Substrate

Enzyme

Product

Complex

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What 3 letters do enzymes typically end in?

-ose

-ase

-ese

-tic

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What affects Enzyme activity?

Nothing

Temperature, Environment, Diet

Temperature,Activators, Ph levels, Inhibitors

Cataylst and Substrate

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following conclusions can be drawn from this graph?

The optimum pH of the enzyme is 6.6.

The optimum pH of the enzyme is 5.8

The enzyme’s activity increases as pH increases 5.0 to 9.0

The enzyme’s activity is greater around pH of 8.0 .

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

on an enzyme, the site that attaches to a substrate

Polypeptide

Base

Substrate

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AP Bio Module 14: Enzymes

Which of the following lowers the activation energy of reactions in biological systems?

What is being represented by the letter B in the image?

What is being represented by the letter A in the image?

What 3 letters do enzymes typically end in?

What affects Enzyme activity?

Which of the following conclusions can be drawn from this graph?

on an enzyme, the site that attaches to a substrate

Which of the following environmental changes could denature an enzyme?

Enzymes act by

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