When pyruvate enters the mitochondrion, one of its carbon atoms becomes a part of a molecule of _________, which is released into the air, while the other two carbon atoms join coenzyme-A to become __________. Two high-energy electron carrier molecules, called __________, are also created.

Carbon dioxide; NAD+; Acetyl-CoA

Checkpoint: What is the difference between NAD+ and NADH?

NAD+ is the oxidized form and NADH is the reduced form.

NAD+ is the reduced form and NADH is the oxidized form.

NAD+ and NADH are both oxidized forms.

NAD+ and NADH are both reduced forms.

How many ATP molecules are created from the two pyruvate molecules that enter the Krebs cycle?

Two ATP molecules are created from two pyruvate molecules.

Four ATP molecules are created from two pyruvate molecules.

Six ATP molecules are created from two pyruvate molecules.

Eight ATP molecules are created from two pyruvate molecules.

How many NADH molecules are created from the two pyruvate molecules that enter the Krebs cycle?

Six NADH molecules are created from two pyruvate molecules.

Four NADH molecules are created from two pyruvate molecules.

Eight NADH molecules are created from two pyruvate molecules.

Two NADH molecules are created from two pyruvate molecules.

What is the function of NADH?

The function of NADH is to carry electrons from a glucose molecule to the electron transport chain.

NADH is used to store energy in the form of ATP.

NADH acts as a structural component of cell membranes.

NADH is responsible for the synthesis of proteins.

Why is an increase in the number of mitochondria beneficial for aerobic exercise?

An increase in mitochondria means the cell has more cellular machinery to perform the citric acid cycle and the electron transport chain.

It decreases the need for oxygen during exercise.

It reduces the production of lactic acid.

It increases the amount of glucose available for energy.

What is the main purpose of the electron transport chain?

The main purpose of the electron transport chain is to produce enough ATP for animals and other organisms to survive.

To transport electrons between cells

To break down glucose into pyruvate

In what part of the mitochondria does the electron transport chain occur?

The electron transport chain occurs in the inner membrane.

The electron transport chain occurs in the outer membrane.

The electron transport chain occurs in the mitochondrial matrix.

The electron transport chain occurs in the intermembrane space.

What is the function of the electrons carried to the chain by NADH and FADH₂?

The electrons carried to the chain by NADH and FADH₂ transfer some of their energy to proteins that pump protons (hydrogen ions) across the membrane.

The electrons carried to the chain by NADH and FADH₂ are used to synthesize glucose.

The electrons carried to the chain by NADH and FADH₂ are stored as ATP.

The electrons carried to the chain by NADH and FADH₂ are used to break down fatty acids.

What is a concentration gradient?

A concentration gradient is a form of potential energy.

A concentration gradient is a type of kinetic energy.

A concentration gradient is a measure of temperature difference.

A concentration gradient is a type of chemical bond.

How is the oxygen gas that we breathe involved in the electron transport chain?

Oxygen is more electronegative, so it takes electrons from the electron transport chain.

Oxygen donates electrons to the electron transport chain.

Oxygen is not involved in the electron transport chain.

Oxygen acts as a catalyst in the electron transport chain.

What is the purpose of the proton gradient in the electron transport chain?

The purpose of the proton gradient is to power the production of ATP. The protons will flow until the concentration is the same on both sides of the membrane (until the gradient disappears).

The proton gradient is used to transport oxygen across the membrane.

The proton gradient helps in the breakdown of glucose molecules.

The proton gradient is responsible for the synthesis of DNA.

What happens to the electron transport chain if oxygen is lacking?

If oxygen is lacking, the gradient will disappear and turn off ATP production.

The electron transport chain will speed up.

The electron transport chain will function normally.

What is the overall purpose of cellular respiration?

The overall purpose of cellular respiration is to generate ATP energy to power cellular functions.

To produce oxygen for the cell.

To convert glucose into proteins.

To store energy in the form of fats.

How does cyanide block the function of the electron transport chain?

Cyanide is a deadly poison because it blocks the function of the electron transport chain. Cyanides binds to the last complex in the chain, blocking oxygen from binding. Therefore, no new electrons can be added to the beginning of the chain which prevents protons from pumping. This will stop the production of ATP, leading to cell death.

Cyanide enhances the function of the electron transport chain by increasing oxygen binding.

Cyanide blocks the electron transport chain by binding to the first complex, allowing more electrons to be added.

Cyanide disrupts the electron transport chain by increasing ATP production.

Biology Unit 2 - Chapter 7.1-7.4 Worksheet Quiz

30 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The purpose of cellular respiration in all living things is to:

produce oxygen for cellular processes.

convert glucose into energy.

store energy in the form of fat.

break down proteins for energy.

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The reactants of cellular respiration are:

Oxygen and glucose

Carbon dioxide and water

ATP and oxygen

Glucose and ATP

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The products of cellular respiration are:

Oxygen and glucose

Carbon dioxide and water

Glucose and water

Oxygen and carbon dioxide

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the overall equation for cellular respiration?

C6H12O6 + 6O2 → 6CO2 + 6H2O + energy

6CO2 + 6H2O + energy → C6H12O6 + 6O2

C6H12O6 + 6O2 → 6CO2 + 6H2O

6CO2 + 6H2O → C6H12O6 + 6O2 + energy

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How are cellular respiration and photosynthesis related to each other?

Cellular respiration and photosynthesis are opposite processes.

Both processes occur in the mitochondria.

Both processes produce oxygen as a byproduct.

Cellular respiration occurs only in plants.

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The three stages of cellular respiration are:

Glycolysis, Krebs cycle, Electron transport chain

Photosynthesis, Glycolysis, Fermentation

Calvin cycle, Krebs cycle, Electron transport chain

Glycolysis, Fermentation, Photosynthesis

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Checkpoint: Where in the cell does glycolysis take place?

Cytoplasm

Mitochondria

Nucleus

Ribosome

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Biology Unit 2 - Chapter 7.1-7.4 Worksheet

The purpose of cellular respiration in all living things is to:

The reactants of cellular respiration are:

The products of cellular respiration are:

What is the overall equation for cellular respiration?

How are cellular respiration and photosynthesis related to each other?

The three stages of cellular respiration are:

Checkpoint: Where in the cell does glycolysis take place?

How many ATP molecules are required as an input into glycolysis?

How many ATP molecules are produced from glycolysis?

Checkpoint: Glycolysis results in the breakdown of one _ molecule into two smaller ___ molecules.

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Discover more resources for Biology

Biology Unit 2 - Chapter 7.1-7.4 Worksheet

The purpose of cellular respiration in all living things is to:

The reactants of cellular respiration are:

The products of cellular respiration are:

What is the overall equation for cellular respiration?

How are cellular respiration and photosynthesis related to each other?

The three stages of cellular respiration are:

Checkpoint: Where in the cell does glycolysis take place?

How many ATP molecules are required as an input into glycolysis?

How many ATP molecules are produced from glycolysis?

Checkpoint: Glycolysis results in the breakdown of one _______ molecule into two smaller _________ molecules.

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Checkpoint: Glycolysis results in the breakdown of one _ molecule into two smaller ___ molecules.