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Cellular Respiration

Total questions: 52

Worksheet time: 52mins

Name
Class
Date
1.

The overall reaction for the aerobic respiration of glucose is summarized as

a)

C6H12O6 + 6 O2 + 6 H2O → 6 CO2 + 12 H2O + Energy

b)

C6H12O6 + 12 H2O + 6 CO2 → 6 O2 + Energy.

c)

C4H12O4 + 6 O2 + 6 H2O → 6 CO2 + Energy.

d)

C4H12O2 + 6 O2 → 6 CO2 + 12 H2O + Energy

2.

In eukaryotes, glycolysis occurs in the:

a)

mitochondrial inner membrane

b)

cytosol

c)

mitochondrial matrix.

d)

Golgi complex

3.

Substrate-level phosphorylation involves the transfer of a phosphate group from:

a)

ATP

b)

ADP

c)

NADH

d)

1,3-bisphosphoglycerate

4.

Glycolysis yields a net energy profit of ___ ATP molecules per molecule of glucose.

a)

0

b)

1

c)

2

d)

4

5.

Considering only glycolysis and the conversion of pyruvate molecules to acetyl CoA molecules, how many NADH molecules will be produced from one glucose molecule?

a)

1

b)

2

c)

3

d)

4

6.

During the Krebs cycle, each acetyl group entering the cycle yields:

a)

1 ATP, 2 NADH, and 3 FADH2

b)

1 ATP, 3 NADH, and 1 FADH2

c)

3 ATP, 2 NADH, and 1 FADH2

d)

4 ATP, 2 NADH, and 1 FADH2

7.

Which of the following steps in the Krebs cycle directly produces a molecule of ATP (or GTP)?

a)

citrate → isocitrate

b)

isocitrate → α-ketoglutarate

c)

succinyl CoA → succinate

d)

succinate → fumarate

8.

When hydrogen ions (protons) are pumped across the inner mitochondrial membrane, they form a proton gradient. ATP is then formed by a process known as:

a)

glycolysis

b)

Krebs cycle

c)

chemiosmosis

d)

substrate-level phosphorylation

9.

During aerobic respiration, oxygen is:

a)

formed from water

b)

reduced to water

c)

oxidized to water

d)

decarboxylated to water

10.

Which of the following molecules can be used as a substrate for cellular respiration?

a)

carbohydrates

b)

fats

c)

proteins

d)

all of the above

11.

What is the term used for the metabolic pathway in which glucose (C6H12O6) is degraded to carbon dioxide (CO2) and water?

a)

cellular respiration

b)

glycolysis

c)

fermentation

d)

Krebs cycle

12.

The ATP made during glycolysis is generated by

a)

substrate-level phosphorylation

b)

electron transport

c)

photophosphorylation

d)

chemiosmosis

13.

Starting with one molecule of glucose, the "net" products of glycolysis are

a)

2 NAD+, 2 H+, 2 pyruvate, 2 ATP, and 2 H2O

b)

2 NADH, 2 H+, 2 pyruvate, 2 ATP, and 2 H2O

c)

2 FADH2, 2 pyruvate, 4 ATP, and 2 H2O

d)

6 CO2, 6 H2O, 2 ATP, and 2 pyruvate.

14.

All of the following are functions of the citric acid cycle except

a)

production of ATP

b)

production of NADH

c)

production of FADH2

d)

adding electrons and protons to oxygen, forming water

15.

Cellular respiration harvests the most chemical energy from which of the following?

a)

Substrate-level phosphorylation

b)

Oxidative phosphorylation

c)

Converting oxygen to ATP

d)

Transferring electrons from organic molecules to pyruvate

16.

During aerobic respiration, which of the following directly donates electrons to the electron transport chain at the lowest energy level?

a)

NAD+

b)

ATP

c)

NADH

d)

FADH2

17.

Energy released by the electron transport chain is used to pump H+ ions into which location?

a)

Cytosol

b)

Mitochondrial Outer Membrane

c)

Mitochondrial Inner Membrane

d)

Mitochondrial Intermembrane Space

18.

Where is ATP synthase located in the mitochondrion?

a)

cytosol

b)

electron transport chain

c)

outer mitochondria membrane

d)

inner mitochondria membrane

19.

Approximately how many molecules of ATP are produced from the complete oxidation of two molecules of glucose (C6H12O6) in cellular respiration?

a)

2

b)

4

c)

38

d)

76

20.

Which of the following occurs in the cytosol of the cell?

a)

Glycolysis and Fermentation

b)

Fermentation and Chemiosmosis

c)

Oxidation of Pyruvate to Acetyl CoA

d)

Krebs Cycle

21.

Which metabolic pathway is common to both cellular respiration and fermentation?

a)

The oxidation of pyruvate to acetyl CoA

b)

The Krebs cycle

c)

Oxidative phosphorylation

d)

Glycolysis

22.

In cellular respiration, the electron transport chain takes place in

a)

the matrix of the mitochondrion

b)

the inner membrane of the mitochondrion

c)

the cytoplasm

d)

the cell nucleus

23.

Oxidation is the ____ and reduction is the _____.

a)

gain of electrons...loss of electrons

b)

loss of electrons.... gain of electrons

c)

loss of oxygen...gain of oxygen

d)

gain of oxygen...loss of oxygen

24.

In the electron transport chain, electrons are passed from one electron transport molecule to another and are finally accepted by

a)

an oxygen molecule

b)

a molecule of carbon dioxide

c)

a molecule of water

d)

ADP

25.
Where does glycolysis take place in cells?
a)
Cytoplasm
b)
Mitochondrion
c)
Endoplasmic Reticulum
d)
Ribosomes
26.
Which molecule is an isomer of Glyceraldehyde-3-Phosphate (G3P)?
a)
DHAP
b)
PEP
c)
Pyruvic Acid
d)
1,3 BPG
27.
Which is not part of the net products of Glycolysis?
a)
2 ATP
b)
2 NADH
c)
2 Pyruvate
d)
2 CO2
28.
The first step of glycolysis results in the formation of:
a)
Glucose-6-Phosphate
b)
Fructose-6-Phosphate
c)
ATP
d)
1,6 Bis-PhosphoGlycerate
29.
NADH is produced by the oxidation of:
a)
G3P
b)
DHAP
c)
PEP
d)
1,3 BPG
30.

Which enzyme adds a phosphate to F-6-Phosphate?

a)

PhosphoFructoKinase

b)

Hexokinase

c)

Aldolase

d)

Pyruvate Kinase

31.

After the NAD+ receives electrons, what does it change to?

a)

ATP

b)

NADH

c)

ADP

32.

How many ATP molecules are required to start glycolysis?

a)

Four

b)

Three

c)

Two

d)

One

33.

The first enzymes that convert glucose into glucose-6-P are

a)

Hexokinase

b)

PFK1

c)

Phosphofructokinase

d)

Aldolase

34.

In glycolysis which 2 reactions use ATP

a)

Fructose-1,6-bisphosphate ---> Glyceraldehyde-3-phosphate

Fructose-1,6-bisphosphate ---> Dihydroxyacetone phosphate

b)

Glucose ----> Glucose-6-phosphate

Glucose-6-phosphate ---> Fructose-6-phosphate

c)

Glucose-6-phosphate ---> Fructose-6-phosphate

Dihydroxyacetone phosphate ---> Glyceraldehyde-3-phosphate

d)

Glucose --> Glucose-6- phosphate

Fructose-6-phosphate---> Fructose-1,6-bisphosphate

35.
The number of ATP molecules produced out of Krebs Cycle is:
a)
2
b)
3
c)
4
d)
0
36.
How many FADH2 molecules are produced by 1 molecule of glucose?
a)
1
b)
2
c)
3
d)
4
37.

ATP is made through which of the following mechanisms in the Kreb's Cycle?

a)

Substrate-level phosphorylation

b)

Oxidative phosphorylation

c)

Photophosphorylation

d)

None of these

38.

Structure E is _____.

a)

FAD

b)

ATP

c)

NAD+

d)

CO2

39.

Structure A is _____.

a)

CoA

b)

ATP

c)

NAD+

d)

CO2

40.

NADH and FADH2

a)

carry energy/electrons to the ETC.

b)

bind with Acetyl CoA.

c)

make pyruvic acid

d)

make water.

41.
The "regenerator" of the Krebs Cycle is:
a)
Oxaloacetate
b)
Acetyl-CoA
c)
Citrate
d)
α-Ketoglutarate
42.
Prior to entering the Krebs Cycle, each pyruvate molecule loses electrons, hydrogen ions, and a carbon, forming an energy-rich molecule of
a)
Acetyl-CoA
b)
Citrate
c)
Oxaloacetate
d)
Malate
43.
NAD and FAD are _________ in the Krebs cycle.
a)
oxidized
b)
reduced
c)
carboxylated
d)
phosphorylated
44.

How many ATP produced for each NADH that enter the electron transport chain from Kreb's cycle?

a)

1

b)

2

c)

3

d)

4

45.

How many ATP produced for each FADH2 that enter the electron transport chain from Kreb's cycle?

a)

1

b)

2

c)

3

d)

4

46.

How many ATP molecules are produced during complete breakdown of glucose in a liver cell?

a)

34

b)

36

c)

38

d)

39

47.

Which of the following statements are TRUE about the process that occurs in cristae?

I ATP is synthesized by ATP synthase on the inner membrane of mitochondrion

II FADH2 transfers its hydrogen atoms to the Complex I

III Formation of water molecule

IV Production of ATP in the electron transport chain is called oxidative phosphorylation

a)

I, II and III

b)

I, II and IV

c)

I, III and IV

d)

I, II, III and IV

48.
What is the main job of the electron carriers in cellular respiration? 
a)
Transport electrons and hydrogen atoms to the electron transport chain 
b)
Capture energy throughout the process of cellular respiration
c)
Provide the reactants for the process of cellular respiration
d)
Pump positive hydrogen ions and shuttle electrons across the electron transport chain and contribute to chemiosmosis
49.
How many ATP are produced in the Electron Transport Chain?
a)
2
b)
30
c)
34
d)
38
50.
What is a product of the Electron Transport Chain?
a)
CO2
b)
O2
c)
C6H1206
d)
H2O
51.
ATP molecules are made by this process during the ETC.
a)
Tinkerbell
b)
Substrate Level Phosphorylation
c)
Oxidative Phosphorylation
d)
Photo-phosphorylation
52.

The number of ATP molecules produced out of Krebs Cycle is:

a)

2

b)

3

c)

4

d)

0

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