Free Practice Quiz Question List

4 Metabolism and Energy Online Quiz Questions

Use this free practice quiz with 20 questions to review 4 Metabolism and Energy, test your knowledge, and prepare for your next test or exam.

20 questions

Written response

1 point

A molecule binds to an enzyme’s active site and is acted on in the reaction. What is this molecule called?

True or false

1 point

An enzyme speeds up a chemical reaction by lowering its activation energy. This changes the reaction’s overall energy balance.

A
True
B
False

Choose one

1 point

A cell runs an enzyme-controlled pathway that breaks a large molecule into smaller molecules and releases usable energy. How should this pathway be classified?

A
An anabolic pathway, because it builds molecules and requires energy
B
A catabolic pathway, because it breaks molecules down and releases usable energy
C
An anabolic pathway, because it breaks molecules down and releases usable energy
D
A catabolic pathway, because it builds molecules and requires energy

Fill in the blank

1 point

During oxidative phosphorylation, protons flow back through ATP synthase, which uses energy from the to make ATP.

True or false

1 point

A growing plant cell carries out cellular respiration to supply ATP for its cellular work.

A
True
B
False

Choose one

1 point

What role do carriers such as NADH and NADPH play in cellular energy transfer?

A
They permanently store energy by creating electrons
B
They catalyze every reaction that transfers electrons
C
They temporarily hold high-energy electrons and deliver them to other reactions
D
They prevent electrons from participating in redox reactions

Choose all

1 point

Select all statements that correctly describe what happens to molecules in redox reactions.

A
A molecule that loses electrons is oxidized.
B
A molecule that gains electrons is oxidized.
C
A molecule that gains electrons is reduced.
D
A molecule that loses electrons is reduced.

Fill in the blank

1 point

In the Calvin cycle, the enzyme RuBisCO helps catalyze .

Written response

1 point

How many ATP molecules are produced net by glycolysis from one glucose molecule?

Choose one

1 point

In aerobic cellular respiration, which molecule is the final electron acceptor, and what happens when it accepts electrons?

A
Carbon dioxide, which combines with NADH to make ATP
B
Pyruvate, which accepts electrons to make oxygen
C
Oxygen, which combines with electrons and protons to form water
D
Glucose, which accepts protons to form carbon dioxide

Choose one

1 point

A metabolic pathway has accumulated enough of its end product. Which regulatory response could reduce further production of that product?

A
The end product activates every enzyme in the pathway so the pathway never slows.
B
The end product inhibits an earlier enzyme, reducing further pathway activity.
C
The end product is consumed to lower the activation energy of every reaction.
D
The end product permanently removes the earlier enzyme from the cell.

Choose all

1 point

Select all statements that correctly compare photosynthesis and cellular respiration.

A
Photosynthesis uses carbon dioxide and water to build energy-rich organic molecules.
B
Cellular respiration stores captured light energy in chemical bonds to build carbohydrates.
C
Cellular respiration uses organic molecules and oxygen and releases carbon dioxide and water.
D
Photosynthesis transfers energy from organic molecules to ATP while releasing carbon dioxide.

Open ended

1 point

When oxygen is unavailable, how does fermentation allow glycolysis to continue, and how does fermentation differ from anaerobic respiration?

Choose one

1 point

Which sequence correctly matches three stages or steps of eukaryotic cellular respiration with their locations?

A
Glycolysis occurs in the mitochondrial matrix, pyruvate breakdown in the cytoplasm, and the electron transport chain in the outer mitochondrial membrane.
B
Glycolysis occurs in the cytoplasm, pyruvate breakdown in the mitochondrial matrix, and the electron transport chain in the inner mitochondrial membrane.
C
Glycolysis occurs in the inner mitochondrial membrane, pyruvate breakdown in the outer membrane, and the electron transport chain in the cytoplasm.
D
Glycolysis occurs in the cytoplasm, pyruvate breakdown in the inner mitochondrial membrane, and the electron transport chain in the mitochondrial matrix.

Choose one

1 point

A cell breaks a large organic molecule into smaller molecules and captures some of the released energy for cellular work. What kind of metabolic pathway is this?

A
An anabolic pathway that builds larger molecules and requires energy
B
A catabolic pathway that breaks molecules down and releases usable energy
C
A pathway that stores energy by converting ATP into light
D
A pathway that transfers electrons without changing molecules

True or false

1 point

A plant cell in bright light can stop carrying out cellular respiration because photosynthesis supplies all the ATP it needs.

A
True
B
False

Choose one

1 point

A reaction slows when a molecule that normally binds to an enzyme can no longer attach to the part where the reaction occurs. Which enzyme feature is most directly involved?

A
The product binds to the enzyme's proton gradient
B
The substrate binds to the enzyme's electron carrier
C
The substrate binds at the enzyme's active site
D
The enzyme binds to the product after it leaves the cell

Choose one

1 point

A cell uses ATP to add a phosphate group to a molecule before that molecule enters a later reaction. Which explanation best describes how ATP helps?

A
ATP hydrolysis can drive phosphorylation that helps activate a molecule for a later reaction.
B
ATP hydrolysis changes the overall energy balance of the later reaction so no energy transfer is needed.
C
ATP hydrolysis permanently attaches ATP to the enzyme so it cannot be used again.
D
ATP hydrolysis creates energy that was not present in the cell.

Written response

1 point

For each glucose molecule processed, what is the net number of ATP molecules produced directly by glycolysis?

Written response

1 point

In a plant chloroplast, which compartment contains the Calvin cycle, where ATP and NADPH are used to incorporate carbon dioxide into organic molecules?