Which statement best explains the function of the cell membrane (lipid bilayer) in living cells?

• A. It stores most of the cell’s genetic information and directly controls inheritance.
• B. It acts as a selectively permeable barrier that regulates the movement of substances into and out of the cell and helps maintain homeostasis.
• C. It serves primarily as the site of ribosome assembly and protein synthesis for the cell.
• D. It provides the main structural framework for the cell by forming rigid cellulose microfibrils.

Answer: (B)