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Worksheets

GB1-LT3

Total questions: 20

Worksheet time: 20mins

Name
Class
Date
1.

Enzymes ___.

a)

A. are proteins, except for a few RNAs

b)

B. lower the activation energy of a reaction

c)

C. are changed by the reaction they catalyze

d)

D. Both A and B

2.

Enzymes function as ___.

a)

A. energy carriers

b)

B. biological catalysts

c)

C. gas transporters

d)

D. structural components

3.

The specificity of an enzyme is due to ___.

a)

A. its high molecular weight

b)

B. the shape of its active site

c)

C. its sensitivity towards pH change

d)

D. the number of substrate molecules

4.

Enzymes can be denatured by ___.

a)

A. increasing the pH

b)

B. changing the substrate

c)

C. decreasing the temperature

d)

D. extreme pH or temperature conditions

5.

The specific region of an enzyme that binds to its substrate is called the ___.

a)

A. activation energy

b)

B. active site

c)

C. product

d)

D. substrate

6.

Enzymes are often named by adding "-ase" to the end of the name of the substrate they act on. What enzyme would act on carbohydrates?

a)

A. Glycosidase

b)

B. Lipase

c)

C. Nuclease

d)

D. Protease

7.

Enzymes catalyze reactions by lowering the activation energy of a reaction. What is activation energy?

a)

A. The energy produced by catalysts.

b)

B. The total energy of a chemical reaction.

c)

C. The energy released during a chemical reaction.

d)

D. The energy required to start a chemical reaction.

8.

To which class of enzymes do dehydrogenases, oxidases, and reductases belong?

a)

A. Ligases

b)

B. Lyases

c)

C. Oxidoreductases

d)

D. Transferases

9.

Enzymes that break down complex carbohydrates into simpler sugars belong to which class?

a)

A. Hydrolases

b)

B. Isomerases

c)

C. Ligases

d)

D. Lyases

10.

Enzymes that catalyze the transfer of functional groups between molecules are known as ___.

a)

A. Hydrolases

b)

B. Isomerases

c)

C. Oxidoreductases

d)

D. Transferases

11.

Enzymes that catalyze the conversion of one isomer into another are known as ___.

a)

A. Isomerase

b)

B. Ligases

c)

C. Lyases

d)

D. Oxidoreductases

12.

Refer to the reaction below between succinate (C4H4O42–) and FAD to form fumarate (C4H2O42–) and FADH2.

succinate + FAD → fumarate + FADH2

Which substance was oxidized in the reaction?

a)

A. FAD

b)

B. FADH2

c)

C. fumarate

d)

D. succinate

13.

Refer to the reaction below between succinate (C4H4O42–) and FAD to form fumarate (C4H2O42–) and FADH2.

succinate + FAD → fumarate + FADH2

Which substance was reduced in the reaction?

a)

A. FAD

b)

B. FADH2

c)

C. fumarate

d)

D. succinate

14.

Refer to the reaction below between succinate (C4H4O42–) and FAD to form fumarate (C4H2O42–) and FADH2.

succinate + FAD → fumarate + FADH2

Which substance is the oxidizing agent?

a)

A. FAD

b)

B. FADH2

c)

C. fumarate

d)

D. succinate

15.

Refer to the reaction below between succinate (C4H4O42–) and FAD to form fumarate (C4H2O42–) and FADH2.

succinate + FAD → fumarate + FADH2

Which substance is the reducing agent?

a)

A. FAD

b)

B. FADH2

c)

C. fumarate

d)

D. succinate

16.

What is the difference between the lock and key mechanism and the induced fit mechanism?

a)

A. The configuration of the active site

b)

B. The composition of the enzyme

c)

C. The type of substrate

d)

D. The type of products formed

17.

In the Lock and Key Mechanism, the active site is ___.

a)

A. complementary to the active site

b)

B. flexible

c)

C. not complementary to the active site

d)

D. rigid

18.

In the Lock and Key Mechanism, the shape of the substrate is ___.

a)

A. complementary to the active site

b)

B. flexible

c)

C. not complementary to the active site

d)

D. rigid

19.

In the Induced Fit Mechanism, the active site is ___.

a)

A. complementary to the active site

b)

B. flexible

c)

C. not complementary to the active site

d)

D. rigid

20.

In the Induced Fit Mechanism, the shape of the substrate is ___.

a)

A. complementary to the active site

b)

B. flexible

c)

C. not complementary to the active site

d)

D. rigid