ATP is called a cell’s “energy currency” because

most of the energy that drives metabolism is supplied by ATP.

ATP catalyzes all metabolic reactions.

ATP allows one organelle to be exchanged for another between cells.

Which best describes how the shape of an enzyme affects its function?

It determines the specific reaction it will catalyze

It determines the raw products needed for the reaction

It determines whether a reaction will be slowed or sped up

It determines the products that will result from the reaction

Enzymes are capable of increasing the rate of a chemical reaction within a living cell. Enzymes accomplish this through which of the following means?

reducing the number of products

increasing the temperature of the cell

increasing the concentration of reactants

Why is ATP an important molecule in metabolism?

It provides energy coupling between exergonic and endergonic reactions.

Its hydrolysis provides an input of free energy for exergonic reactions.

Its terminal phosphate group contains a strong covalent bond that when hydrolyzed releases free energy.

Its terminal phosphate bond has higher energy than the other two.

Which of the following statements is (are) true about enzyme-catalyzed reactions?

The reaction is faster than the same reaction in the absence of the enzyme.

The free energy change of the reaction is opposite from the reaction in the absence of the enzyme.

The reaction always goes in the direction toward chemical equilibrium

Enzyme-catalyzed are always exergonic/catabolic

What is the main purpose of the light reactions?

To provide the energy and electrons for the calvin cycle

To capture energy and make sugar

Which of the following statements describes NAD+?

NAD+ is reduced to NADH during glycolysis and the citric acid cycle.

NAD+ has more chemical energy than NADH.

NAD+ is oxidized by the action of hydrogenases.

NAD+ can donate electrons for use in oxidative phosphorylation.

In the absence of NAD+, glycolysis can still function.

Where does glycolysis take place in eukaryotic cells?

mitochondrial intermembrane space

Most of the CO 2 from the catabolism of glucose is released during...

chemiosmosis and oxidative phosphorylation

During aerobic respiration, electrons travel downhill in which sequence?

glucose → NADH → ETC → oxygen

glucose → pyruvate → ATP → oxygen

glucose → ATP → ETC → NADH

glucose → ATP → FADH2 → citric acid

The oxygen consumed during cellular respiration is involved directly in which process or event?

accepting electrons at the end of the ETC

Which of the following factors would you not expect to influence the action of enzymes?

The amount of reactant in the cell

In oxidative phosphorylation, what is the most direct source of energy that is used to convert ADP + P i to ATP?

energy released from the movement of protons (H + ) through ATP synthase.

energy released as electrons flow through the electron transport system.

energy released from substrate-level phosphorylation.

energy released from ATP synthase pumping hydrogen ions against their concentration gradient.

No external source of energy is required because the reaction is exergonic.

Which of the following statements is true concerning the figure?

It represents cell processes to minimize photorespiration

It represents an adaptation to cellular respiraiton

It is an aerobic pathway that mimics photosynthesis

It represents the type of cell structures found in CAM plants

CAM plants keep stomata closed in daytime, thus reducing loss of water. They can do this because they

fix CO 2 into organic acids during the night.

fix CO 2 into organic acids in bundle-sheath cells.

fix CO 2 into pyruvate in the mesophyll cells.

The enzyme creatine phosphokinase is known to directly participate in the phosphorylation of ADP to ATP. High levels of ADP would most likely

increase the activity of the enzyme

decrease the activity of the enzyme

over stimulate the enzyme's active site causing denaturation

What do the electrons added to NAD + do?

They go to another pathway for ATP production.

They become part of a fermentation pathway.

They energize the entry of the acetyl group into the citric acid cycle.

An allosteric inhibitor does which of the following?

Binds to an enzyme away from the active site and changes the conformation of the active site, decreasing its affinity for the substrate

Binds to an enzyme away from the active site and changes the conformation of the active site, increasing its affinity for substrate binding

Binds to the active site and blocks it from binding substrate

Binds directly to the active site and mimics the substrate

Energy is stored long-term in the bonds of _____ and used short-term to perform work from a(n) _____ molecule.

an anabolic molecule : catabolic molecule

a catabolic molecule : anabolic molecule

Which of the following properly describes the metabolic role of fermentation in certain cells?

It oxidizes NADH to NAD+ allowing for glycolysis to continue

It is an exergonic reaction that fuels the endergonic phosphorylation of ADP to ATP

It produces FADH molecules used in oxidative phosphorylation

It removes the oxygen to produce an aerobic condition

DNA replication involves unwinding two strands of parent DNA, copying each strand to synthesize complementary strands, and releasing the parent and daughter DNA so now there are two copies of the original strand. Which of the following accurately describes this process?

This is both anabolic and catabolic

This is a metabolic process but is neither anabolic nor catabolic

Which statement is true according to the image?

The red curve shows the same reaction as the black curve when catalyzed by an enzyme

The black curve shows the same reaction as the red curve when catalyzed by an enzyme

More activation energy is required in the reaction represented by the red curve

The two curves above are not related

A reducing chemical reaction ________.

adds an electron to the substrate

reduces the compound to a simpler form

removes a hydrogen atom from the substrate

AP.Bio Unit 3 Review Cellular Energetics

11th Grade - University

•

44 Qs

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AP.Bio Unit 3 Review Cellular Energetics

Quiz

•

Biology

•

11th Grade - University

•

Practice Problem

•

Medium

•

NGSS

HS-LS1-7, HS-LS1-5, HS-LS2-3

Standards-aligned

Noah Cabiac

Used 695+ times

FREE Resource

About this resource

This AP Biology Unit 3 quiz comprehensively covers cellular energetics at the 11th-12th grade level, focusing on the fundamental processes of photosynthesis, cellular respiration, and enzyme function. Students need a solid understanding of biochemical pathways including glycolysis, the citric acid cycle, and oxidative phosphorylation, as well as the light-dependent and light-independent reactions of photosynthesis. The questions require mastery of enzyme kinetics, competitive and allosteric inhibition, and the role of electron carriers like NAD+ and FADH2. Students must also understand energy coupling through ATP, the differences between anabolic and catabolic pathways, and specialized adaptations like CAM photosynthesis. The complexity of these questions demands strong analytical skills to interpret biochemical processes, compare metabolic pathways, and apply knowledge of cellular compartmentalization and energy transformations. Created by Noah Cabiac, a Biology teacher in US who teaches grade 11-13. This comprehensive review quiz serves multiple instructional purposes throughout the cellular energetics unit, functioning effectively as a formative assessment tool to gauge student understanding before the AP exam. Teachers can deploy this quiz as a chapter review after completing instruction on photosynthesis and cellular respiration, use individual questions as warm-up activities to reinforce previous learning, or assign it as homework to help students identify knowledge gaps. The quiz aligns with AP Biology Learning Objectives 2.4-2.5 covering cellular processes that store and release energy, and Learning Objectives 4.14-4.17 addressing enzyme function and metabolic regulation. The variety of question formats, from basic recall to complex application scenarios, makes this an excellent resource for differentiated instruction and targeted review sessions before unit exams.

44 questions

Show all answers

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How can photosynthesis be related to cellular respiration?

What's produced (made) by one is needed (the reactants) for the other

They both produce the same products

They both have the same reactants (need the same things)

These 2 processes have nothing in common

Tags

NGSS.HS-LS2-5

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The reactants of photosynthesis are

sugar and water.

sugar and oxygen.

carbon dioxide, light and water.

carbon dioxide and oxygen.

Tags

NGSS.MS-LS1-6

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Enzymes are

proteins that function as catalysts

broken down in reactions that require energy input

used up in chemical reactions.

not needed for catabolic reactions

Tags

NGSS.MS-LS1-7

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Succinate dehydrogenase catalyzes the conversion of succinate to fumarate. The reaction is inhibited by malonic acid, which resembles succinate but cannot be acted upon by succinate dehydrogenase. Increasing the ratio of succinate to malonic acid reduces the inhibitory effect of malonic acid. What is malonic acid's role with respect to succinate dehydrogenase?

It is a competitive inhibitor.

It is an allosteric regulator.

It is able to bind to succinate.

It blocks the binding of fumarate.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Which of the following is true for anabolic pathways?

they do not depend on enzymes

they are usually spontaneous chemical reactions

they consume energy to build polymers from monomers

They release energy as they degrade polymers to monomers

Tags

NGSS.HS-LS1-6

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

The mechanism by which the end product of a metabolic pathway inhibits an earlier step in the pathway is called ___________

metabolic inhibition

feedback inhibition

irreversible inhibition

allosteric regulation

Tags

NGSS.HS-LS1-3

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

A degradative process such as cellular respiration can also be known as...

catabolic pathway

kinetic pathway

endergonic pathway

anabolic pathway

Tags

NGSS.HS-LS1-7

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AP.Bio Unit 3 Review Cellular Energetics

44 questions

How can photosynthesis be related to cellular respiration?

The reactants of photosynthesis are

Enzymes are

Which of the following is true for anabolic pathways?

The mechanism by which the end product of a metabolic pathway inhibits an earlier step in the pathway is called ___________

A degradative process such as cellular respiration can also be known as...

ATP is called a cell’s “energy currency” because

Energy is released from ATP when

Which best describes how the shape of an enzyme affects its function?

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