What is one of the main functions of the cell membrane?

• A. To store genetic material
• B. To facilitate cell communication
• C. To prevent all ions from entering
• D. To absorb nutrients

Answer: (B)

The main function of the cell membrane is to facilitate cell communication. This structure acts as a selective barrier that not only regulates the entry and exit of substances but also plays a crucial role in communication between the cell and its environment. The cell membrane contains various proteins that function as receptors, allowing the cell to receive signals from hormones, neurotransmitters, and other signaling molecules. This communication is vital for processes such as growth, immune response, and intercellular signaling, which are essential for maintaining homeostasis and coordinating various physiological functions within the organism.

Other options focus on different roles that are not the primary function of the cell membrane. While the cell membrane does help protect and maintain the integrity of the cell and control the movement of ions and nutrients, these functions are part of a broader spectrum of activities that support the communication function. Storing genetic material relates to the nucleus, and absorbing nutrients involves mechanisms like endocytosis that go beyond the direct role of the membrane itself.