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Cellular Respiration

Total questions: 100

Worksheet time: 50mins

Name
Class
Date
1.

What biological process is likely being introduced by the image showing a chameleon eating an insect, with the title 'Cellular Respiration'?

a)

Fermentation

b)

Photosynthesis

c)

Cellular Respiration

d)

Digestion

2.

What is the name of the structure labeled as 'ATP synthase particles'?

a)

Matrix

b)

Cristae

c)

ATP synthase particles

d)

Ribosomes

3.

What is the name of the space between the inner and outer membranes?

a)

cytoplasm

b)

matrix

c)

cristae

d)

inter membrane space

4.

What is the name of the area inside the inner membrane?

a)

Stroma

b)

Cristae

c)

Matrix

d)

Intermembrane space

5.

Look at the diagram of the mitochondria. What is the name of the small structures responsible for protein synthesis?

a)

Matrix

b)

Cristae

c)

Ribosome

d)

ATP synthase

6.

What is the name of the folds in the inner membrane?

a)

thylakoids

b)

lamellae

c)

cristae

d)

villi

7.

What is the name of the small particles found in the matrix?

a)

Crystals

b)

Fibers

c)

Granules

d)

Droplets

8.

Look at the diagram of the mitochondria. What is the name of the genetic material found inside?

a)

Protein

b)

Lipid

c)

DNA

d)

RNA

9.

What is the name of the membrane that surrounds the matrix?

a)

Plasma membrane

b)

Outer membrane

c)

Inner membrane

d)

Nuclear membrane

10.

What is the name of the membrane that surrounds the entire mitochondrion?

a)

Plasma membrane

b)

Inner membrane

c)

Outer membrane

d)

Nuclear membrane

11.

What type of energy do cells harvest from organic molecules during cellular respiration?

a)

Thermal energy

b)

Radiant energy

c)

Chemical energy

d)

Electrical energy

12.

What is the main product generated by cells using the energy stored in organic molecules?

a)

Oxygen

b)

Carbon dioxide

c)

ATP

d)

Glucose

13.

Which of the following is the correct equation for cellular respiration?

a)

CO2 + H2O + energy → Organic molecules + oxygen

b)

Oxygen + glucose → CO2 + H2O + energy

c)

Organic molecules + CO2 → oxygen + H2O + energy

d)

Organic molecules + oxygen → CO2 + H2O + energy

14.

Starch is the major source of fuel for animals. What does starch break down into?

a)

Fructose

b)

Cellulose

c)

Glucose

d)

Sucrose

15.

Autotrophs produce ______ that heterotrophs use in cellular respiration.

a)

carbon dioxide

b)

oxygen

c)

glucose

d)

water

16.

What is the catabolic breakdown of glucose called?

a)

Fermentation

b)

Glycolysis

c)

Photosynthesis

d)

Cellular Respiration

17.

Fill in the blank: The chemical equation for cellular respiration is ___ .

a)

C6H12O6 + 6O2 → 6CO2 + 6H2O

b)

C6H12O6 + 6O2 → 6CO2 + 6H2O + energy (ATP and heat)

c)

C6H12O6 + 6CO2 → 6O2 + 6H2O + energy (ATP and heat)

d)

6CO2 + 6H2O → C6H12O6 + 6O2 + energy (ATP and heat)

18.

In the process of cellular respiration, which molecule is oxidized?

a)

CO2

b)

O2

c)

H2O

d)

C6H12O6

19.

In the process of cellular respiration, which molecule is reduced?

a)

CO2

b)

C6H12O6

c)

O2

d)

H2O

20.

What does the mnemonic OIL RIG stand for in cellular respiration?

a)

Oxygen Is Low, Respiration Is Good

b)

Oxygen Is Lost, Respiration Is Gained

c)

Oxidation Is Loss, Reduction Is Gain

d)

Oxidation Is Light, Reduction Is Great

21.

Fill in the blank: The oxidation of glucose transfers electrons to a ______ energy state, releasing energy to be used in ATP synthesis.

a)

excited

b)

neutral

c)

lower

d)

higher

22.

During cellular respiration, most electrons will follow this 'downhill' exergonic path: glucose → ______ → ETC → oxygen. Fill in the blank.

a)

FADH2

b)

NADH

c)

CO2

d)

ATP

23.

During cellular respiration, most electrons will follow this 'downhill' exergonic path: glucose → NADH → ______ → oxygen. Fill in the blank.

a)

ATP synthase

b)

Glycolysis

c)

ETC

d)

Ribosome

24.

Which molecule is the final electron acceptor in the path of electrons during cellular respiration?

a)

ETC

b)

Oxygen

c)

Glucose

d)

NADH

25.

Arrange the following in the correct order of the electron path during cellular respiration: NADH, oxygen, glucose, ETC.

a)

ETC → glucose → NADH → oxygen

b)

glucose → NADH → ETC → oxygen

c)

glucose → ETC → NADH → oxygen

d)

NADH → glucose → ETC → oxygen

26.

What is broken down in steps to harvest energy?

a)

Oxygen

b)

Carbon dioxide

c)

Glucose

d)

Water

27.

Electrons are taken from ______ at different steps to harvest energy. Fill in the blank.

a)

carbon dioxide

b)

oxygen

c)

glucose

d)

water

28.

Each electron (e-) taken travels with a ______ (H+). Fill in the blank.

a)

neutron

b)

photon

c)

proton

d)

electron

29.

Which enzyme takes 2 electrons and 2 protons from glucose?

a)

Reductases

b)

Oxidases

c)

Dehydrogenases

d)

Kinases

30.

What is the oxidizing agent for glucose in the process of energy harvest?

a)

Phosphatases

b)

Kinases

c)

Dehydrogenases

d)

ATP synthase

31.

The coenzyme NAD+ is reduced to ______, which stores the energy. Fill in the blank.

a)

CO2

b)

ATP

c)

NADH

d)

FADH2

32.

NADH carries electrons to the ______.

a)

Cytoplasm

b)

Nucleus

c)

Electron transport chain

d)

Mitochondria

33.

What is the Electron Transport Chain (ETC)?

a)

A type of enzyme

b)

A process that breaks down glucose

c)

A sequence of membrane proteins that shuttle electrons down a series of redox reactions

d)

A storage molecule for ATP

34.

The energy released by the Electron Transport Chain (ETC) is used to make _______.

a)

Glucose

b)

NADH

c)

ATP

d)

Oxygen

35.

In the Electron Transport Chain (ETC), electrons are transferred to O2 (the final electron acceptor) to make what molecule?

a)

CO2

b)

H2O

c)

ATP

d)

Glucose

36.

True or False: The Electron Transport Chain (ETC) releases energy.

a)

True

b)

False

37.

What are the three stages of cellular respiration?

a)

Pyruvate oxidation, Fermentation, Chemiosmosis

b)

Photosynthesis, Fermentation, Glycolysis

c)

Glycolysis, Pyruvate oxidation and the citric acid cycle, Oxidative phosphorylation (ETC and chemiosmosis)

d)

Glycolysis, Photosynthesis, Citric acid cycle

38.

Fill in the blank: There are ______ stages of cellular respiration.

a)

four

b)

five

c)

three

d)

two

39.

Match the following stages of cellular respiration with their correct order:

a)

First

1.

1

b)

Second

2.

2

c)

Third

3.

3

40.

What is the starting point of cellular respiration?

a)

Pyruvate oxidation

b)

ETC and chemiosmosis

c)

Glycolysis

d)

Citric acid cycle

41.

Where does glycolysis occur?

a)

Chloroplast

b)

Mitochondria

c)

Cytosol

d)

Nucleus

42.

Glycolysis splits glucose (6C) into how many pyruvates and how many carbons are in each pyruvate?

a)

3 pyruvates, each with 2 carbons (2C)

b)

2 pyruvates, each with 2 carbons (2C)

c)

2 pyruvates, each with 3 carbons (3C)

d)

1 pyruvate, with 6 carbons (6C)

43.

Arrange the following stages of cellular respiration in the correct order as shown in the diagram:

a)

A) Citric acid cycle, B) Glycolysis, C) Pyruvate oxidation, D) ETC and chemiosmosis

b)

A) Glycolysis, B) Pyruvate oxidation, C) Citric acid cycle, D) ETC and chemiosmosis

c)

A) Pyruvate oxidation, B) Glycolysis, C) Citric acid cycle, D) ETC and chemiosmosis

d)

A) ETC and chemiosmosis, B) Citric acid cycle, C) Glycolysis, D) Pyruvate oxidation

44.

What is the starting molecule for glycolysis?

a)

Fructose

b)

Pyruvate

c)

Lactate

d)

Glucose

45.

What does the symbol 'ATP' stand for?

a)

Adenosine tetraphosphate

b)

Adenine triphosphate

c)

Amino triphosphate

d)

Adenosine triphosphate

46.

What does the symbol 'ADP' stand for?

a)

Adenosine triphosphate

b)

Adenosine diphosphate

c)

Adenine diphosphate

d)

Amino diphosphate

47.

What does the symbol 'NAD+' stand for?

a)

Nicotinamide adenosine dinucleotide

b)

Nicotinamide adenosine diphosphate

c)

Nicotinamide adenine dinucleotide

d)

Nicotinamide adenine diphosphate

48.

Which enzyme converts glucose to glucose 6-phosphate?

a)

Phosphatase

b)

Isomerase

c)

Hexokinase

d)

Aldolase

49.

Which molecule is produced at the end of glycolysis?

a)

Glucose

b)

Lactate

c)

Pyruvate

d)

ATP

50.

Refer to the legend in the glycolysis diagram. What does the yellow circle represent?

a)

Phosphate group

b)

Carbon

c)

Hydrogen

d)

Oxygen

51.

Refer to the glycolysis diagram. Which enzyme is responsible for converting phosphoenolpyruvate to pyruvate?

a)

Phosphoglycerate mutase

b)

Hexokinase

c)

Pyruvate kinase

d)

Enolase

52.

According to the summarized pathway of glycolysis, what is the starting molecule?

a)

Glucose

b)

Fructose

c)

Pyruvate

d)

Lactate

53.

According to the summarized pathway of glycolysis, how many molecules of ATP are produced?

a)

2 ATP

b)

1 ATP

c)

4 ATP

d)

0 ATP

54.

According to the summarized pathway of glycolysis, what are the end products?

a)

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

b)

2 lactate, 2 ATP, 2 NADH + 2H+, 2 CO2

c)

2 acetyl-CoA, 2 ATP, 2 NADH + 2H+, 2 H2O

d)

2 pyruvate, 4 ATP, 2 NADH + 2H+, 2 H2O

55.

Which of the following is NOT a product of glycolysis?

a)

2 pyruvate

b)

2 ATP

c)

2 NADH + 2H+

d)

2 NAD+

56.

Glycolysis has two stages. Which of the following is the stage where the cell uses ATP to phosphorylate compounds of glucose?

a)

Energy investment stage

b)

Energy payoff stage

c)

Substrate level phosphorylation

d)

Electron transport chain

57.

In glycolysis, which stage produces energy by substrate level phosphorylation?

a)

Energy investment stage

b)

Energy payoff stage

c)

Citric acid cycle

d)

Oxidative phosphorylation

58.

Fill in the blank: The net energy yield per 1 glucose in glycolysis is ___ ATP and ___ NADH.

a)

2 ATP and 2 NADH

b)

4 ATP and 2 NADH

c)

2 ATP and 4 NADH

d)

1 ATP and 2 NADH

59.

What is the initial energy investment in glycolysis?

a)

2 ATP

b)

4 ATP

c)

2 ADP

d)

2 NADH

60.

During glycolysis, 2 ATP are converted to _______.

a)

2 ADP + P

b)

2 AMP + PPi

c)

2 NADH + H+

d)

2 GTP + Pi

61.

What is the total ATP produced during the energy payoff phase of glycolysis?

a)

2 ATP

b)

4 ATP

c)

2 ADP

d)

4 ADP

62.

Fill in the blank: 2 NAD⁺ + 4e⁻ + 4H⁺ → _______

a)

2 NADH + 2H⁺

b)

2 NADH

c)

NAD⁺ + NADH + 2H⁺

d)

2 NAD⁺ + 2H⁺

63.

What are the net products of glycolysis?

a)

2 Pyruvate, 2 H₂O, 2 ATP, 2 NADH + 2H⁺

b)

2 ADP, 2 NAD⁺, 2 ATP, 2 H₂O

c)

4 ATP, 2 NADH, 2 Pyruvate

d)

2 Pyruvate, 2 ATP, 2 NAD⁺

64.

Where does glycolysis occur?

a)

cytosol

b)

mitochondria

c)

nucleus

d)

endoplasmic reticulum

65.

What is produced through glycolysis?

a)

pyruvate

b)

glucose

c)

lactate

d)

acetyl-CoA

66.

What is the net production of ATP?

a)

2 ATP

b)

4 ATP

c)

1 ATP

d)

0 ATP

67.

If oxygen is present, the pyruvate enters the ________ (eukaryotic cells).

a)

mitochondria

b)

cytoplasm

c)

nucleus

d)

ribosome

68.

Pyruvate is ________ into acetyl coA.

a)

oxidized

b)

reduced

c)

hydrolyzed

d)

phosphorylated

69.

Acetyl coA is used to make ________ in the citric acid cycle.

a)

citrate

b)

oxaloacetate

c)

succinate

d)

fumarate

70.

How many CO₂ and NADH molecules are produced during pyruvate oxidation?

a)

2 CO₂ and 2 NADH

b)

1 CO₂ and 1 NADH

c)

2 CO₂ and 1 NADH

d)

1 CO₂ and 2 NADH

71.

Which of the following is the correct sequence of steps in cellular respiration as shown in the diagram?

a)

A) Glycolysis → Pyruvate oxidation → Citric acid cycle → ETC and chemiosmosis

b)

B) Citric acid cycle → Glycolysis → Pyruvate oxidation → ETC and chemiosmosis

c)

C) Glycolysis → Citric acid cycle → Pyruvate oxidation → ETC and chemiosmosis

d)

D) ETC and chemiosmosis → Glycolysis → Pyruvate oxidation → Citric acid cycle

72.

What is the end product formed from pyruvate in this process?

a)

Glucose

b)

Acetyl CoA

c)

Lactic acid

d)

Ethanol

73.

Which molecule is reduced during the conversion of pyruvate to Acetyl CoA?

a)

NAD+

b)

FAD

c)

ATP

d)

ADP

74.

During pyruvate oxidation, ______ is released as a byproduct.

a)

CO2

b)

O2

c)

H2O

d)

ATP

75.

What coenzyme is required for the conversion of pyruvate to Acetyl CoA?

a)

CoA

b)

FAD

c)

NADP+

d)

ATP

76.

What is another name for the Citric Acid Cycle?

a)

Calvin Cycle

b)

Krebs Cycle

c)

Glycolysis

d)

Electron Transport Chain

77.

Where does the Citric Acid Cycle occur?

a)

Cytoplasm

b)

Mitochondrial matrix

c)

Nucleus

d)

Cell membrane

78.

The Citric Acid Cycle turns acetyl CoA into _______.

a)

citrate

b)

glucose

c)

lactate

d)

pyruvate

79.

Which of the following is released during the Citric Acid Cycle?

a)

O2

b)

CO2

c)

H2O

d)

Glucose

80.

During the Citric Acid Cycle, electrons are transferred to which molecules?

a)

NADH and FADH2

b)

ATP and ADP

c)

Glucose and Fructose

d)

CO2 and H2O

81.

Match the following metabolic processes with their sequence in cellular respiration:

a)

First

1.

1

b)

Second

2.

2

c)

Third

3.

3

d)

Fourth

4.

4

82.

Which molecule is the starting point of the Citric Acid Cycle?

a)

Pyruvate

b)

Citrate

c)

Malate

d)

Fumarate

83.

Match the following molecules with their correct position in the Citric Acid Cycle:

a)

After Acetyl-CoA

1.

Citrate

b)

Before Oxaloacetate

2.

Malate

c)

After Succinate

3.

Fumarate

d)

Before Succinate

4.

Succinyl-CoA

84.

Fill in the blank: The enzyme that converts citrate to isocitrate is _________

a)

Aconitase

b)

Citrate synthase

c)

Succinate dehydrogenase

d)

Fumarase

85.

According to the legend, which color represents Oxygen in the Citric Acid Cycle diagram?

a)

Yellow

b)

Red

c)

Black

d)

Orange

86.

Fill in the blank: The molecule formed after the action of Malate dehydrogenase is _________

a)

Oxaloacetate

b)

Citrate

c)

Succinate

d)

Fumarate

87.

Which enzyme is responsible for converting succinate to fumarate?

a)

Citrate synthase

b)

Succinate dehydrogenase

c)

Malate dehydrogenase

d)

Aconitase

88.

Fill in the blank: The Citric Acid Cycle is also known as the _________ cycle.

a)

Krebs

b)

Calvin

c)

Glycolysis

d)

Urea

89.

NADH is produced during the conversion of isocitrate to α-ketoglutarate.

a)

True

b)

False

90.

What is the input to the Citric Acid Cycle per glucose molecule?

a)

2 acetyl CoA

b)

2 pyruvate

c)

2 NADH

d)

2 FADH2

91.

How many ATP molecules are produced as an output of the Citric Acid Cycle per glucose molecule?

a)

2 ATP

b)

1 ATP

c)

4 ATP

d)

0 ATP

92.

How many NADH molecules are produced as an output of the Citric Acid Cycle per glucose molecule?

a)

6 NADH

b)

2 NADH

c)

4 NADH

d)

8 NADH

93.

How many CO₂ molecules are produced as an output of the Citric Acid Cycle per glucose molecule?

a)

4 CO₂

b)

2 CO₂

c)

6 CO₂

d)

8 CO₂

94.

How many FADH₂ molecules are produced as an output of the Citric Acid Cycle per glucose molecule?

a)

2 FADH₂

b)

1 FADH₂

c)

4 FADH₂

d)

0 FADH₂

95.

Which of the following is NOT an output of the Citric Acid Cycle per glucose molecule?

a)

A) ATP

b)

B) NADH

c)

C) Acetyl CoA

d)

D) CO₂

96.

Where does the citric acid cycle occur?

a)

mitochondrial matrix

b)

cytoplasm

c)

nucleus

d)

endoplasmic reticulum

97.

What is the net production of ATP in the citric acid cycle?

a)

2 ATP

b)

1 ATP

c)

4 ATP

d)

0 ATP

98.

Oxidative phosphorylation consists of two main processes. Fill in the blank: The first process is _________?

a)

Electron transport chain

b)

Glycolysis

c)

Fermentation

d)

Citric acid cycle

99.

Oxidative phosphorylation consists of two main processes. Fill in the blank: The second process is _________?

a)

Chemiosmosis

b)

Glycolysis

c)

Fermentation

d)

Photolysis

100.

Which of the following is the first stage of cellular respiration?

a)

Glycolysis

b)

Pyruvate oxidation

c)

Citric acid cycle

d)

ETC and chemiosmosis

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