Florida Biology EOC Practice Test 2025 – 400 Free Practice Questions to Pass the Exam

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What is the function of the plasma membrane?

Energy production

Regulating what enters and leaves the cell

The function of the plasma membrane is to regulate what enters and leaves the cell. This selective permeability is crucial for maintaining the cell's internal environment, known as homeostasis. The plasma membrane is composed of a phospholipid bilayer with embedded proteins, which play key roles in transport and signaling. By controlling the movement of substances such as nutrients, waste products, ions, and water, the plasma membrane ensures that essential molecules can enter the cell while preventing harmful substances from passing through. This regulation is vital for the survival of the cell and its ability to carry out vital functions.

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Protein synthesis

DNA storage

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