Biology CLEP Prep Practice Exam

Disable ads (and more) with a membership for a one time $2.99 payment

Are you gearing up for the Biology CLEP exam? Prepare like a pro with our Biology CLEP Prep Practice Exam!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

Why do cells need oxygen?

To produce movement
To generate heat
To provide energy
To complete complex metabolic reactions

The correct answer is: To provide energy

Cells need oxygen to provide energy through cellular respiration, in which glucose and oxygen are used to produce ATP, the main source of energy for cells. Options A and B are incorrect because cells do not produce movement or generate heat through the use of oxygen. Option D is incorrect because while oxygen is used in a variety of metabolic reactions, it is not required to "complete" them.