Free Printable Enzymes (EDITED)

1.

How does an enzyme's activity change with increasing concentration of substrate?

a)

decreases

b)

stays the same

c)

no change

d)

increases

2.

What makes an enzyme substrate specific?

a)

Size

b)

Shape

c)

Name

d)

Location it is found in

3.

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

a)

The optimum pH of the enzyme is 6.6.

b)

The optimum pH of the enzyme is 5.8

c)

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

d)

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

4.

What type of macromolecule are enzymes?

a)

Protein

b)

Carbohydrate

c)

Lipid

d)

Nucleic Acid

5.

Enzymes need certain environmental conditions in order to function properly. What happens when enzymes are heated to a high temperature?

a)

they die

b)

they denature

c)

they change their amino acid sequence

d)

they work better

6.

The part of the enzyme that the substrate bonds to is called the _____.

a)

active site

b)

activation energy

c)

bond site

d)

peptide bond

7.

Which of these do NOT affect enzyme activity?

a)

Temperature

b)

pH

c)

Competitive Inhibitors

d)

Carbohydrates

8.

Which of these is NOT true.

a)

Enzymes can denature (change shape) when the temperature gets too high.

b)

Enzymes can only be used once in a chemical reaction.

c)

Enzymes can denature when the pH changes.

d)

Enzymes speed up chemical reactions.

9.

Which of these is most likely an enzyme? (Based on the suffix)

a)

Sucrose

b)

Galactose

c)

Fructose

d)

Amylase

10.

Which is NOT true?

a)

Enzymes speed up chemical reactions

b)

Enzymes react best at a specific temperature

c)

Enzymes only control ONE type of reaction

d)

Enzymes are made of lipids

11.

What is another name for enzymes?

a)

chemical catalyst

b)

microorganism

c)

biological catalyst

d)

catalyst

12.

What is the optimum temperature for most enzymes in humans

a)

0

b)

20

c)

40

d)

80

13.

Which of the following is a not a use of enzymes?

a)

hormone production

b)

DNA replication

c)

Protein synthesis

d)

digestion of food

14.

What is the name for the mechanism of enzyme activity?

a)

Lock and key

b)

jigsaw puzzle

c)

hammer and nail

d)

two hands pattern

15.

How do enzymes work?

a)

Slow down chemical reactions

b)

Prevent chemical reactions from working

c)

increase the activation energy

d)

speed up the chemical reaction

16.

What are the enzymes called when they are at low temperature?

a)

denatured

b)

Killed

c)

inactive

d)

normal

17.

Babies do not have well developed system to digest proteins, hence the baby food is prepared after treatement with which enzyme?

a)

protease

b)

lipase

c)

carbohydrase

d)

synthase

18.

Isomerase is special kind of enzyme which converts?

a)

glucose-> sucrose

b)

fructose-> glucose

c)

glucose -> Fructose

d)

Sucrose -> Fructose

19.

As the temperature increases, enzyme's rate of reaction increases why?

a)

increased no. of enzymes

b)

substrates are active

c)

higher kinetic energy so higher collisions

d)

enzymes are occupied

20.

In the experiment conducted to check the affect of substrate concentration on rate of reaction. What is the independant variable?

a)

Time

b)

Reaction Rate

c)

concentration of substrate

d)

concentration of enzyme

21.

What is the substrate for the enzyme catalase?

a)

Hydrogen

b)

Water

c)

Oxygen

d)

Hydrogen Peroxide

22.

During the reaction between catalase and hydrogen peroxide, the rate of reaction is noted after counting the gas of bubbles, What are the properties of this gas?

a)

it relights glowing splint

b)

turns lime water milky

c)

pop sound

d)

changes color of carbonate indicator

23.

What is broken down by the enzyme Amylase?

a)

Sugar

b)

Starch

c)

Oils

d)

Meat

24.

What is the optimum pH of pepsin (found in the stomach gastric juice of humans)

a)

5

b)

2

c)

7

d)

9

25.

Why does the reaction rate reaches plateau in the experiment conducted to test the affects of increasing concentration of enzyme?

a)

time

b)

limited by substrate

c)

enzymes are denatured

d)

enzymes are inactive

26.

What is the dependant variable in testing the effect of temperature on enzyme activity?

a)

enzyme

b)

rate of reaction

c)

temperature

d)

time

27.

If you are testing for the effect of enzyme concentration on rate of reaction, what IS NOT a control variable?

a)

type of enzyme

b)

enzyme concentration

c)

concentration of substrate

d)

Type of substrate

28.

You did the experiment to test for catalase using the potato strip and hydrogen peroxide. You noticed that if you replace the Hydrogen peroxide after the first reaction, Bubbles can be seeb again! Why?

a)

enzymes are used up

b)

enzymes are occupied

c)

enzymes can be reused

d)

enzymes are denatured

29.

which one of the following is NOT the property of enzymes?

a)

enzyme actions are specific

b)

enzymes can be reused

c)

enzymes are affected by pH

d)

Optimum temperature of all enzymes is 37

30.

the pH at which an enzyme is most efficient is called the _________ pH of an enzyme

a)

neutral

b)

optimum

c)

minimum

d)

experimental

31.

Sucrase, an enzyme, is added to a solution containing water and sucrose. Which experimental factor would have the least impact on the rate of the reaction?

a)

light

b)

temperature

c)

enzyme concentration

d)

substrate concentration

32.

Many people are lactose intolerant and cannot digest dairy products. What enzyme are their bodies most likely lacking?

a)

lipase

b)

lactase

c)

maltase

d)

protease

33.

The enzyme amylase helps the body breakdown starch in food and functions optimally at body temperature (37 C). A young child runs a fever of 40C for 24 hours. Predict the effect this may have on his digestion.

a)

Digestion will increase because starch molecules are colliding faster with the enzyme.

b)

Digestion will increase because enzyme activity improves at higher temperature.

c)

Digestion will decrease because starch molecules are colliding faster with the enzyme.

d)

Digestion will decrease because the shape of the enzyme is altered past optimal temperature.

34.

An experiment was designed to determine how one factor affects the germination of piñon pine seeds. Ten seeds were kept at room temperature (22oC), ten seeds were kept at 0oC, and ten seeds were kept at -10oC. Seeds were checked daily until germination occurred. What is the independent variable?

a)

Temperature

b)

type of seeds

c)

time

d)

seed germination

35.

An experiment was designed to determine how one factor affects the germination of piñon pine seeds. Ten seeds were kept at room temperature (22oC), ten seeds were kept at 0oC, and ten seeds were kept at -10oC. Seeds were checked daily until germination occurred. What is the dependent variable?

a)

Temperature

b)

type of seeds

c)

time

d)

seed germination

36.

An experiment was designed to determine how one factor affects the germination of piñon pine seeds. Ten seeds were kept at room temperature (22oC), ten seeds were kept at 0oC, and ten seeds were kept at -10oC. Seeds were checked daily until germination occurred. What are the constants? Select all that apply.

a)

soil

b)

type of seed

c)

seed germination

d)

temperature

e)

water

37.

What is a?

a)

substrate

b)

enzyme

c)

products

d)

active site

38.

What is b?

a)

substrate

b)

enzyme

c)

products

d)

active site

39.

If catalase is denatured which of the following increases?

a)

H20 (water)

b)

O2 (oxygen)

c)

H2O2 (hydrogen peroxide)

d)

all of the above

40.

If catalase is denatured which of the following decreases?

a)

H20 (water)

b)

O2 (oxygen)

c)

H2O2 (hydrogen peroxide)

d)

all of the above

41.

Which Graph shows that an enzyme works best at a pH of 4?

a)

b)

c)

d)

42.

Which graph shows that an enzyme works best at 15 degrees?

a)

b)

c)

d)

43.

Which line shows that an enzyme works best at an ACIDIC pH?

a)

A

b)

B

c)

C

44.

Which Enzyme works best at a temperature of 37?

a)

Enzyme A

b)

Enzyme B

45.

What can we conclude from the graph? At a temperature of 62 ...

a)

Enzyme activity is highest

b)

Enzyme activity is low but working

c)

Enzyme is denatured

Enzymes (EDITED)

Total questions: 45

Worksheet time: 31mins

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