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 main function of cell membranes?

Regulating what enters and leaves the cell
Holding genetic information
Providing energy for metabolic reactions
Modifying proteins

The correct answer is: Regulating what enters and leaves the cell

Cell membranes serve as a selective barrier that regulates the movement of substances in and out of the cell. This function is essential for maintaining a stable internal environment and ensuring essential molecules enter the cell while harmful substances are kept out. Option B is incorrect because genetic information is stored in the nucleus, not the cell membrane. Option C is incorrect because energy production occurs in specific organelles, not the cell membrane. Option D is incorrect as protein modification occurs in the endoplasmic reticulum and Golgi apparatus, not the cell membrane.