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AP Biology Unit 3 Review

Total questions: 64

Worksheet time: 39mins

Name
Class
Date
1.

What type of macromolecule is an enzyme?

a)

a protein

b)

a lipid

c)

a nucleic acid

d)

a carbohydrate

2.

Which of the following is NOT a part of photosynthesis?

a)

Calvin cycle

b)

Light reactions

c)

Light independent reactions

d)

Krebs cycle

3.

Where do the light reactions take place?

a)

Cytosol

b)

Thylakoid membrane

c)

Stroma

d)

Mitochondrial matrix

4.

What is the input for the light reactions?

a)

Light energy

b)

ATP

c)

NADPH

d)

H2O

5.

What is the output for the light reactions?

a)

Light energy

b)

ATP

c)

NADPH

d)

H2O

6.

Where does the Calvin cycle take place?

a)

Cytosol

b)

Thylakoid membrane

c)

Stroma

d)

Mitochondrial matrix

7.

What is the input for the Calvin cycle?

a)

CO2

b)

H2O

c)

NADPH

d)

ATP

e)

G3P

8.

What is the output for the Calvin cycle?

a)

CO2

b)

H2O

c)

NADPH

d)

ATP

e)

G3P

9.

How many CO2 molecules are needed to make 1 G3P?

a)

1

b)

2

c)

3

d)

6

10.

How many turns of the Calvin cycle are required for 1 G3P to be synthesized?

a)

1

b)

2

c)

3

d)

6

11.

How many NADPHs are required for the Calvin cycle?

a)

2

b)

3

c)

6

d)

9

12.

How many ATPs are required for the Calvin cycle?

a)

2

b)

3

c)

6

d)

9

13.

Which of the following describes the pathway of electrons in the light reactions? 

a)

O2 →\rightarrow   PS II →\rightarrow  

PS I →\rightarrow   NADH

b)

O2 →\rightarrow   PS II →\rightarrow  

PS I →\rightarrow   NADPH

c)

O2 →\rightarrow   PS I →\rightarrow  

PS II →\rightarrow   NADPH

d)

O2 →\rightarrow   PS I →\rightarrow  

PS II →\rightarrow   NADH

14.

What is the function of an enzyme?

a)

To speed up a chemical reaction

b)

To provide additional energy

c)

To inhibit a cellular process

d)

To increase absorption of a molecule

15.

Which of the following would NOT denature an enzyme?

a)

HIGH temperature

b)

LOW pH

c)

HIGH pH

d)

LOW temperature

16.

What happens to the reaction rate if an enzyme is denatured or nonfunctional?

a)

No change in the reaction rate

b)

Increase in reaction rate

c)

Decrease in reaction rate

d)

Decrease then increase in reaction rate

17.

Which of the following is NOT a way that enzymes speed up chemical reactions?

a)

Strain bonds in the structure

b)

Orient reacting molecules

c)

Provide favorable environment

d)

Increase required energy of activation

18.

An enzyme can make an endergonic reaction into an exergonic reaction.

a)

True

b)

False

19.

Which of the following is a way to overcome competitive inhibition of an enzyme?

a)

Increase product concentration

b)

Increase substrate concentration

c)

Decrease enzyme concentration

d)

Decrease environmental temperature

20.

Where does a substrate bind to an enzyme?

a)

Active site

b)

Allosteric site

21.

How does a noncompetitive inhibitor decrease reaction rates?

a)

Binds to the active site

b)

Binds to the allosteric site

c)

Increases the free energy

d)

Increases the substrate concentration

22.

Which of the following is NOT a step in cellular respiration?

a)

Glycolysis

b)

Krebs Cycle

c)

Oxidative Phosphorylation

d)

Calvin Cycle

23.

Where does glycolysis take place?

a)

Cytosol

b)

Mitochondrial matrix

c)

Mitochondrial cristae

d)

Stroma

e)

Thylakoid membrane

24.

What is the input of glycolysis?

a)

Glucose

b)

Pyruvate

c)

NADH

d)

G3P

25.

What is the output of glycolysis?

a)

Glucose

b)

2 pyruvate

c)

2 NADH

d)

2 ATP

e)

2 FADH2

26.

What is the main function of glycolysis?

a)

To complete the breakdown of glucose

b)

To generate a proton gradient and synthesize ATP

c)

To split a glucose molecule in half and synthesize NADH

27.

Where does the Krebs Cycle take place?

a)

Cytosol

b)

Mitochondrial matrix

c)

Mitochondrial cristae

d)

Stroma

e)

Thylakoid membrane

28.

What is the input of the Krebs Cycle?

a)

Pyruvate

b)

Acetyl CoA

c)

Glucose

d)

NADH

29.

What is the output of the Krebs Cycle (one turn)?

a)

3 NADH

b)

1 FADH2

c)

1 ATP

d)

2 CO2

e)

Acetyl CoA

30.

What is the main function of the Krebs Cycle?

a)

To complete the breakdown of glucose

b)

To generate a proton gradient and synthesize ATP

c)

To split a glucose molecule in half and synthesize NADH

31.

Where does oxidative phosphorylation take place?

a)

Cytosol

b)

Mitochondrial matrix

c)

Mitochondrial cristae

d)

Stroma

e)

Thylakoid membrane

32.

What is the input of oxidative phosphorylation?

a)

NADH

b)

FADH2

c)

Pyruvate

d)

Glucose

e)

ATP

33.

What is the output of oxidative phosphorylation?

a)

ATP

b)

NADH

c)

FADH2

d)

Glucose

34.

What does the term optimum mean for enzyme temperature?

a)

The lowest temperature at which the enzyme works

b)

The temperature which gives the highest enzyme activity

c)

The temperature which gives the lowest enzyme activity

d)

The highest temperature before denaturing occurs

35.
Each enzyme only has 1 substrate that will fit its active site.  What is this called?
a)
reusablility
b)
denaturation
c)
specificity
d)
fragility
36.
In the diagram, what is letter A? 
a)
product
b)
substrate
c)
enzyme-substrate complex
d)
active site
37.
An enzyme speeds up a chemical reaction in the cell but can only be used once.  True or False? 
a)
true
b)
false
38.
With what 3 letters do enzymes typically end?
a)
-ose
b)
-ase
c)
-ese
d)
-tic
39.
Letter D...
a)
active site
b)
enzyme
c)
substrate
d)
products
40.
Letter B...
a)
active site
b)
enzyme
c)
substrate
d)
products
41.
Letter C...
a)
active site
b)
enzymes
c)
substrate
d)
products
42.
Letter E...
a)
active site
b)
enzyme
c)
substrate
d)
products
43.
An enzyme speeds up a reaction by
a)
lowering the activation energy.
b)
raising the activation energy.
c)
releasing energy.
d)
absorbing energy.
44.

What happens when enzymes are heated to a high temperature?

a)

The enzymes die.

b)

The shape of the enzyme are changed and it denatures

c)

The enzymes' amino acid sequence changes.

d)

The enzymes remain the same

45.
Based on the graph, what temperature does this enzyme work best? 
a)
15 C
b)
40 C
c)
30 C
d)
47 C
46.
Enzymes will make a reaction go _______ and use ______ energy.
a)
faster, less
b)
faster, more
c)
slower, less
d)
slower, more
47.
What happens to an enzyme when it is denatured?
a)
Activation energy is lowered.
b)
It becomes stronger.
c)
It loses its shape.
d)
Activation energy is raised.
48.
Every enzyme has a optimal temperature and pH. True or False?
a)
True 
b)
False
49.
When a molecule can occupy the same active site as the substrate, a situation called __________________ can result
a)
Competitive lnhibition
b)
Allosteric Regulation
c)
Non-Competitive Inhibition
d)
Feedback Inhibition
50.

A receptor site that a molecule can bind to that changes the shape of the active site is called a(n):

a)

Allosteric Site

b)

Active Site

c)

Activation site

d)

Reactant site

51.

Molecules that bind to enzymes and enhance an enzyme's ability are called:

a)

CoFactors

b)

Competitive Inhibitors

c)

Allosteric Inhibitors

52.

You are carrying out an experiment with an enzyme from the human small intestine. If the enzyme in solution is saturated with substrate, the most effective way to obtain a product more quickly is to

a)

Add more enzyme

b)

Add more substrate

c)

Increase the concentration of the enzyme solution

d)

Heat the enzyme solution above 38 °C

53.

Which of the following can be used to determine the rate of an enzyme-catalyzed reaction?

a)

The rate of substrate formed

b)

The decrease in temperature in the system

c)

The rate of enzyme used up

d)

The rate of substrate used up

54.
This is referred to as the energy currency of the cell
a)
ADP
b)
ATP
c)
Mitochondria
d)
Nucleus
55.

Glucose is broken down into pyruvic acid during which process

a)
Krebs cycle
b)
Calvin cycle
c)
Glycolysis
d)
Photosynthesis
56.
Aerobic respiration is different from anaerobic respiration in that aerobic respiration needs...
a)
chlorophyll
b)
carbon dioxide
c)
glucose
d)
oxygen
57.
What is the correct equation for cellular respiration?
a)
6O2 + C6H12O6 -> 6CO2 + 6H2O + Energy
b)
6O2 + C6H12O6 + Energy -> 6CO2 + 6H2O
c)
6CO2 + 6H2O -> 6O2 + C6H12O6 + Energy
d)
6CO2 + 6H2O + Energy -> 6O2 + C6H12O6
58.
Where does the Krebs Cycle take place?
a)
mitochondria
b)
chloroplast
c)
cytoplasm
d)
nucleus
59.

Which molecule isn't a high energy hydrogen carrier?

a)
FADH2
b)
NADH
c)
oxygen
60.
The energy in ATP is stored 
a)
in the bond between the second and third phosphate
b)
in the bond between the first and second phosphate
c)
in the bond between the adenosine and the first phosphate
d)
I like turtles
61.

What are the reactants (taken into) of cellular respiration? (Mark all of them!)

a)

oxygen

b)

glucose

c)

carbon dioxide

d)

water

e)

energy

62.

Each glucose (6C) produces how many pyruvic acid (3C) molecules?

a)

5

b)

2

c)

3

d)

4

63.

Which of the following do at least one stage of cellular respiration

a)

plants

b)

animals

c)

bacteria

d)

fungi

64.

What happens to the carbon atoms in glucose during cellular respiration?

a)

They are exhaled as CO2CO_2  

b)

They disappear

c)

They are broken down and dissolve

d)

They stay in the mitochondria forever

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