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AP Biology Practice Quiz: Introduction to Macromolecules

Written by AP Content Team, Verified for 2026 AP Exams, Last updated: May 2026

Test your understanding with short quizzes. This quiz has 9 questions to check your progress.

Question 1 of 9

Which process is responsible for joining smaller molecules to form a polymer, involving the removal of a water molecule?

All Questions (9)

Which process is responsible for joining smaller molecules to form a polymer, involving the removal of a water molecule?

A) Hydrolysis

B) Dehydration synthesis

C) Covalent cleavage

D) Water addition

Correct Answer: B

According to the provided text, dehydration synthesis is the chemical reaction that joins smaller molecules into polymers by forming covalent bonds and removing a water molecule.

The breakdown of a biological macromolecule into its smaller subunits is accomplished through which of the following reactions?

A) Dehydration synthesis

B) Polymerization

C) Hydrolysis

D) Covalent formation

Correct Answer: C

The provided content states that hydrolysis is a chemical reaction that breaks down molecules by cleaving covalent bonds, which is how macromolecules are broken into smaller subunits.

In the process of hydrolysis, what is the role of the water molecule?

A) It is removed to form a new covalent bond.

B) It is added to cleave a covalent bond.

C) It acts as a catalyst without being consumed.

D) It is formed as a byproduct of the reaction.

Correct Answer: B

The text explicitly states that hydrolysis breaks down molecules by cleaving covalent bonds 'with the addition of water'.

When two smaller molecules are joined together via dehydration synthesis, what are the resulting products?

A) A larger molecule and a water molecule.

B) Two separate monomers and a water molecule.

C) A larger molecule only, with water being consumed.

D) A single monomer, with water being released.

Correct Answer: A

Dehydration synthesis joins smaller molecules into a larger one (a polymer) by 'removing a water molecule.' Therefore, the products are the newly formed larger molecule and the water molecule that was removed.

A student observes a chemical reaction where a large polymer is being broken down into smaller, individual units. Which statement accurately describes the chemical process occurring?

A) Dehydration synthesis is occurring, consuming a water molecule to build the polymer.

B) Hydrolysis is occurring, consuming a water molecule to break a covalent bond.

C) Dehydration synthesis is occurring, releasing a water molecule as bonds are broken.

D) Hydrolysis is occurring, releasing a water molecule as the polymer is formed.

Correct Answer: B

The breakdown of a polymer into smaller units is achieved through hydrolysis. This process involves the addition (consumption) of a water molecule to cleave the covalent bonds linking the units.

The formation of a covalent bond between two monomers to build a macromolecule is characteristic of which reaction?

A) Hydrolysis, which uses water to form bonds.

B) Dehydration synthesis, which removes water to form a bond.

C) Bond cleavage, which breaks down molecules.

D) Water lysis, which splits water molecules.

Correct Answer: B

The content specifies that dehydration synthesis joins molecules 'by forming covalent bonds and removing a water molecule.'

Which of the following best contrasts dehydration synthesis and hydrolysis?

A) Dehydration synthesis builds polymers by adding water, while hydrolysis breaks them down by removing water.

B) Dehydration synthesis breaks down polymers by removing water, while hydrolysis builds them by adding water.

C) Dehydration synthesis builds polymers by removing water, while hydrolysis breaks them down by adding water.

D) Both processes build polymers, but one uses water and the other does not.

Correct Answer: C

Based on the provided definitions, dehydration synthesis is a building (synthesis) process that removes water, whereas hydrolysis is a breaking down process that adds water.

To cleave a covalent bond within a biological macromolecule and separate it into smaller molecules, what must be added to the reaction?

A) Another polymer

B) A source of energy

C) A water molecule

D) A covalent bond

Correct Answer: C

The definition of hydrolysis clearly states that it is a chemical reaction that breaks down molecules by cleaving covalent bonds 'with the addition of water.'

The chemical reactions responsible for building and breaking down biological macromolecules are fundamentally based on the:

A) removal or addition of carbon atoms to the molecular backbone.

B) formation and breaking of ionic bonds through salt exchange.

C) removal or addition of water molecules to form or cleave covalent bonds.

D) transfer of electrons between monomers, creating charged polymers.

Correct Answer: C

The provided content describes the two key processes, dehydration synthesis (removing water to form covalent bonds) and hydrolysis (adding water to cleave covalent bonds), which are the central mechanisms for building and breaking down macromolecules.