Biology CLEP Prep Practice Exam

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Prepare for the Biology CLEP Test with comprehensive flashcards and multiple choice questions. Each question comes with explanations and hints to ensure a full understanding. Boost your exam readiness today!

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What is the role of oxygen in cellular respiration?

To provide energy to the cell
To act as a reactant in the Krebs cycle
To provide an electron for electron transport chains
To store energy for later use

The correct answer is: To provide an electron for electron transport chains

During cellular respiration, oxygen plays a critical role in the electron transport chain. This is where energy from glucose is converted into ATP, the energy currency of cells. Oxygen accepts electrons from the electron transport chain and combines with hydrogen ions to form water, releasing energy that is used to generate ATP. Option A is incorrect because oxygen does not directly provide energy to the cell. Option B is incorrect because oxygen is not a reactant in the Krebs cycle, but rather in the electron transport chain. Option D is incorrect because oxygen does not store energy for later use but instead helps to produce energy.