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Worksheets

Ib Bio Biotech

Total questions: 25

Worksheet time: 9mins

Name
Class
Date
1.

An enzyme is a

a)

carbohydrate.

b)

protein.

c)

lipid.

d)

nucleic acid.

2.

The region on the surface of the enzyme that the substrate binds to is the

a)

active site.

b)

activation energy.

c)

lock-and-key model.

d)

catalysis.

3.

What suffix is commonly applied to enzymes?

a)

-ase

b)

-ose

c)

-ter

d)

-ice

4.

Enzymes act as catalysts to __________ the rate of a biochemical reaction by ___________ the activation energy needed for the reaction to occur.

a)

increase, lowering

b)

decrease, lowering

c)

increase, raising

d)

decrease, raising

5.

T/F: The lock-and-key model indicates that one enzyme binds to one specific substrate both structurally and chemically.

a)

true

b)

false

6.

According to the induced fit model, as a substrate approaches an enzyme, it induces a ______________ in the active site.

a)

conformational change

b)

chemical change

c)

color change

7.

The coming together of a substrate and the enzyme's active site is known as

a)

collision.

b)

activation energy.

c)

denaturation.

d)

increasing pH.

8.

Collisions are the result of _______ of the substrate and enzyme. Successful collisions are ones in which the substrate and active site correctly ______.

a)

random movements, align

b)

repulsion, repel

c)

cooling, attract

d)

denaturation, match up

9.

After an enzyme is denatured, the substrate can ______ to the active site.

a)

bind

b)

no longer bind

10.

Low temperatures result in _______ thermal energy for the activation of an enzyme-catalyzed reaction.

a)

insufficient

b)

overabundant

11.

As temperature increases toward the optimal level, the kinetic energy of the enzyme and substrate ________, resulting in ________ collisions.

a)

increases, more frequent

b)

increases, less frequent

c)

decreases, more frequent

d)

decreases, less frequent

12.

At temperatures above the optimum temperature, enzyme stability will _______ as the thermal energy disrupts _______ bonds.

a)

decrease, hydrogen

b)

decrease, ionic

c)

increase, hydrogen

d)

increase, ionic

13.

The loss of enzyme shape is called

a)

denaturation.

b)

stress.

c)

random movement.

d)

alignment.

14.

T/F: All enzymes have the same optimum pH range.

a)

true

b)

false

15.

The graph for substrate concentration vs enzyme activity plateaus because

a)

all active sites are full and the enzymes are working at their maximum efficiency.

b)

the enzymes are used up and there aren't any left.

16.

Enzymes used in industry are commonly

a)

immobilized.

b)

replaced after every catalysis reaction.

c)

unstable.

d)

unconcentrated.

17.

_______ is the enzyme that hydrolyzes _______ into glucose and galactose.

a)

Lactase, lactose

b)

Lactose, lactase

18.

Which of these are common uses for enzymes in industry:

a)

Detergents

b)

Making paper

c)

Making carbonated drinks

d)

Producing biofuel

e)

Textiles

19.

What is enzyme immobilisation?

a)

Enzymes being used in industry

b)

Enzymes denaturing in an acidic pH

c)

Enzymes attached to a surface

d)

Enzymes denaturing due to temperature.

20.

Lactase breaks down lactose into:

a)

galactose + glucose

b)

glucose + glycogen

c)

galactose + glycogen

d)

galactose + glycerol

21.

Choose the correct answer.

a)

A

b)

B

c)

C

d)

D

22.

Choose the correct answer.

a)

A

b)

B

c)

C

d)

D

23.

Choose the correct answer.

a)

A

b)

B

c)

C

d)

D

24.

Choose the correct answer.

a)

A

b)

B

c)

C

d)

D

25.

Choose the correct answer.

a)

A

b)

B

c)

C

d)

D