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AP Biology Practice Quiz: Elements of Life

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

Test your understanding with short quizzes. This quiz has 7 questions to check your progress.

Question 1 of 7

According to the provided text, which group of elements is described as primary for building the molecules used by living organisms?

All Questions (7)

According to the provided text, which group of elements is described as primary for building the molecules used by living organisms?

A) Carbon, Hydrogen, and Oxygen

B) Sulfur, Phosphorus, and Nitrogen

C) Carbon, Nitrogen, and Phosphorus

D) Oxygen, Sulfur, and Hydrogen

Correct Answer: A

The text explicitly states, 'Carbon, hydrogen, and oxygen are primary.'

Based on the information provided, the element sulfur is identified as a key component for which of the following essential macromolecules?

A) Phospholipids

B) Nucleic acids

C) Proteins

D) Primary molecules

Correct Answer: C

The content specifies that 'Sulfur is key for proteins.'

A biologist discovers that an organism has a deficiency that prevents it from properly forming both phospholipids and nucleic acids. Based on the text, a lack of which element is the most likely cause of this issue?

A) Carbon

B) Nitrogen

C) Sulfur

D) Phosphorus

Correct Answer: D

The text states that phosphorus is key for both 'phospholipids and nucleic acids.' Therefore, a deficiency in phosphorus would impact the formation of both types of molecules.

Which element is explicitly mentioned in the text as being essential for the composition of nucleic acids?

A) Sulfur and Phosphorus

B) Nitrogen and Phosphorus

C) Carbon and Oxygen

D) Sulfur and Nitrogen

Correct Answer: B

The text states that 'phosphorus for... nucleic acids; and nitrogen for nucleic acids,' identifying both as essential for this macromolecule.

What is the source of the atoms that organisms use to build essential macromolecules, according to the provided information?

A) The sun

B) The environment

C) Internal metabolic processes

D) Other living organisms

Correct Answer: B

The text begins by stating, 'Organisms use atoms from the environment to build molecules.'

An analysis of a newly discovered macromolecule reveals the presence of carbon, hydrogen, oxygen, and nitrogen. Based strictly on the roles described in the text, which of the following could the macromolecule be?

A) A phospholipid

B) A protein

C) A nucleic acid

D) A primary atom

Correct Answer: C

The text states that carbon, hydrogen, and oxygen are primary elements. It specifically links nitrogen to nucleic acids ('nitrogen for nucleic acids'). While proteins also contain nitrogen, the provided text only explicitly connects sulfur to proteins as a key distinguishing element.

The text describes the composition of essential macromolecules. Which of the following correctly pairs an element with all the molecules the text identifies it with?

A) Nitrogen: nucleic acids and proteins

B) Sulfur: proteins and phospholipids

C) Phosphorus: phospholipids and nucleic acids

D) Oxygen: proteins and nucleic acids

Correct Answer: C

The text explicitly states 'phosphorus for phospholipids and nucleic acids,' linking this single element to both molecules. The other options make connections not supported by the provided content.