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AP Bio Unit 3 MC Test Review

Total questions: 50

Worksheet time: 48mins

Name
Class
Date
1.

Label the parts of the enzyme model

a)Substrate
b)Products
c)Enzyme
d)Active site
1
2
3
4
1)
2)
3)
4)
2.
Enzymes are...
a)
nucleic acids
b)
proteins
c)
lipids
d)
carbohydrates
3.
Which enzyme is most efficient in a basic solution?
a)
A
b)
B
4.
An enzyme speeds up a reaction by
a)
lowering the activation energy.
b)
raising the activation energy.
c)
releasing energy.
d)
absorbing energy.
5.

Enzyme can be used again and again

a)

True

b)

False

6.

Which term most precisely describes the cellular process of breaking down large molecules into smaller ones?

a)

catabolism

b)

metabolism

c)

anabolism

d)

dehydration

7.

Match the following

a)

Binds to active site to slow reaction

1.

Competitive

b)

Binds at a different spot on enzyme to change shape

2.

Allosteric

c)

Binds to active site

3.

Substrate

d)

Speeds up a chemical reaction without being used up

4.

Catalyst

e)

Part of enzyme where reactants bind to

5.

Active Site

8.

Enzyme X has an optimum rate of reaction at 97 degrees Fahrenheit. How would rate of reaction be affected if temperature fell to 92 degrees Fahrenheit?

a)

increase - not as hot

b)

decrease - no substrate would be produced

c)

increase - more substrate would be produced

d)

decrease - cause a change in the shape of the protein

9.
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 .
10.
What is structure D?
a)
Substrate
b)
Active site
c)
Enzyme
d)
Products
11.
Which of the following is part of the first law of thermodynamics?
a)
energy cannot be created or destroyed
b)
entropy of the universe is constant
c)
kinetic energy is stored energy
d)
energy cannot be transferred or transformed
12.

Which environmental conditions can cause denaturation of the enzyme?

a)

slight increase in temperature

b)

extreme increase in temperature

c)

decrease in temperature

d)

extreme increase in temperature and pH changes

13.

Describe why an increase in temperature increases the rate of the reaction.

a)

increase in temperature increases the speed/kinetic energy of particles

b)

increase in temperature activates more enzyme to increase the rate

c)

increase in temperature results in increase in substrate available

d)

increase in temperature allows for a tighter fit in the active site

14.
The _____ Law of Thermodynamics says that heat always flows from an object with a higher temperature to an object of lower temperature naturally
a)
Zeroth
b)
First
c)
Second
d)
Third
15.

Inhibitor that binds to the active site

a)

Competitive inhibitor

b)

Noncompetitive inhibitor

16.

How do you overcome a competitive inhibitor?

a)

Add more ATP

b)

Add more inhibitor

c)

Add more products

d)

Add more reactants

17.

How does an increase in substrate affect reaction rate?

a)

Decrease forever

b)

Increase forever

c)

Decrease until enzyme saturated

d)

Increase until enzyme saturated

18.

Where does the substrate bind on an enzyme?

a)

Active site

b)

Enhancer

c)

Promoter

d)

TATA box

19.

What molecule is responsible for powering cellular processes?

a)

ATP

b)

Glucose

c)

Membrane Potential

d)

Sucrose

20.

What is the input for the Calvin cycle?

a)

CO2

b)

H2O

c)

NADPH

d)

ATP

e)

G3P

21.

Describe the pathway of electrons in the light reactions.

a)

H2O → PSI → ETC → PSII → NADPH

b)

H2O → PSII → ETC → PSI → NADPH

c)

H2O → PSII → ETC → PSI → NADH

d)

H2O → PSI → ETC → PSII → NADH

22.
What is the primary function of the light reactions of photosynthesis?
a)
To produce glucose
b)
To produce NADPH and ATP
c)
To use ATP
d)
To produce RuBP
23.
What is the function of NADP+?
a)
It absorbs light
b)
It is an electron carrier
c)
It is a light-reflecting pigment
d)
It acts as long-term energy storage
24.
The light reactions occur in the ________ and the dark reactions take place in the ________.
a)
Chloroplast / thylakoid membrane
b)
stroma / thylakoid
c)
mesophyl / stomata
d)
thylakoid membrane / stroma
25.
Which product is produced by the splitting of water during the light-dependent reactions of photosynthesis?
a)
NADPH
b)
oxygen
c)
glucose
d)
carbon dioxide
26.

What is the best reason that plants do not perform photosynthesis at night?

a)

They close their stomata at night to rest

b)

They do not have an energy source to power the light reactions

c)

Only a few types of plants are nocturnal

d)

There is less carbon dioxide released into the air at night

27.

What are the net products of photosynthesis?

a)

6 CO2, 6 H2O, Energy

b)

6 O2 and 6 H2O

c)

C6H12O6 and 6 O2

d)

6 CO2 and C6H12O6

28.

What does CAM plants store?

a)

H20

b)

CO2

c)

Sunlight

d)

Carbon Dioxide

29.

CAM plants have a different adaptation to what climate

a)

cold and wet

b)

hot and dry

c)

both

d)

none of the above

30.

In C4 plants, the Calvin cycle....

a)

Takes place at night

b)

Only occurs when the stomata are closed

c)

Takes place in the mesophyll

d)

Takes place in the bundle-sheath cells

31.

What are C3 plants?

a)

These plants are the best when it comes to storing water due to their extremely dry environments

b)

These plants mostly just reduce the rate of photorespiration

c)

plants that do the calvin cycle in the mesophyll cells

32.

In C3 photosynthesis, the reactions that require ATP take place in

a)

the light reactions alone

b)

the calvin cycle only

c)

both the light reactions and the calvin cycle

d)

the citric acid cycle

33.

The main problem encountered by C3 plants in hot conditions is:

a)

Transpiration

b)

PhotoRespiration

c)

Dehydration

d)

Starvation

34.

Which type of plant fixes carbon only at night?

a)

C3

b)

C4

c)

CAM

d)

all of these

35.

Which step of photosynthesis synthesizes G3P?

a)

Calvin Cycle

b)

Glycolysis

c)

Krebs Cycle

d)

Light Reactions

36.

How many carbon dioxides are used in the Calvin Cycle?

a)

1

b)

2

c)

3

d)

6

37.

What enzyme used is for carbon fixation?

a)

ATP Synthase

b)

Decarboxylase

c)

PEP Carboxylase

d)

Rubisco

38.
The H+ concentration gradient is used to 
a)
make NADPH
b)
split a water molecule
c)
generate ATP
d)
form water
39.

What is the function of the electron transport chain between Photosystem II and Photosystem I?

a)

establish electrochemical gradient of protons

b)

to funnel electrons into photosystem I for the Calvin cycle

c)

transport electrons to oxygen to make water

d)

to synthesize ATP using ATP synthase

40.
What are the net outputs of glycolysis?
a)
2 ATP, 2 NADH, 3 Pyruvate
b)
3 ATP, 2 NADH, 3 Pyruvate
c)
2 ATP, 2 NADH, 1 Pyruvate
d)
2 ATP, 2 NADH, 2 Pyruvate
41.

What are the outputs of the Citric Acid Cycle (Krebs Cycle) for one molecule of ACETYL CO-A?

a)

1 ATP, 3 NADH, 1 FADH2, 2 CO2

b)

1 ADP, 3 NADH, 1 FAD+, 2 CO2

c)

1 ATP, 3 NAD+, 1 FADH2, 2 CO2

d)

1 ADP, 3 NAD+, 1 FAD+, 2 CO2

42.

What are the products of the light-dependent reactions of photosynthesis?

a)

ATP & NADH

b)

CO2 & H2O

c)

NADPH & ATP

d)

Organic Compounds & O2

43.

Which of the following are electron carriers for the electron transport chain in cellular respiration?

a)

NADPH

b)

FADH2

c)

NADH

d)

NADH & FADH2

44.

The final electron acceptor of aerobic respiration is _______ and this allows _______________ to continue.

a)

oxygen, electron flow

b)

water, citric acid cycle

c)

carbon dioxide, aerobic respiration

d)

NAD+, chemiosmosis

45.

Which reaction moves the cellular respiration process from the cytoplasm to the mitochondria?

a)

glycolysis ---> pyruvate

b)

pyruvate ---> acetyl CoA

c)

acetyl CoA ---> PGA

d)

PGA ---> PGAL

46.

Which step is anaerobic?

a)

Glycolysis

b)

Krebs Cycle

c)

Oxidative Phosphorylation

47.

Which process precedes fermentation?

a)

Calvin Cycle

b)

Glycolysis

c)

Krebs Cycle

d)

Oxidative Phosphorylation

48.

What process performed by the bacteria caused the low pH?

a)

Fermentation/Glycolysis

b)

Krebs Cycle

c)

Oxidative Phosphorylation

d)

All of the above

49.

The main purpose of fermentation is to

a)

produce oxygen

b)

replenish NAD+ for glycolysis

c)

replenish oxaloacetic acid for the Krebs cycle

d)

produce ATP

50.

The reduction of acetaldehyde allows...

a)

NAD+ to be regenerated from NADH

b)

The oxidation of pyruvate

c)

NADP to be regenerated from NADPH

d)

The oxidation of ethanol

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