Final answer:
The plasma membrane defines the cell's boundaries, selectively allows substances in and out, provides flexibility, and facilitates cell recognition and biochemical reactions. It does not, however, provide the cell with energy.
Step-by-step explanation:
The cell membrane, also known as the plasma membrane, plays a significant role in maintaining the integrity of the cell and managing its interactions with the environment. It does not however, give the cell energy for life’s activities, which is the function of organelles like mitochondria. The main functions of the plasma membrane include:
- Defining the cell's boundaries and maintaining its structural integrity.
- Regulating traffic of substances in and out of the cell, thus ensuring selective permeability.
- Allowing for flexibility which is important for the movement of cells, particularly in narrow spaces.
- Cell recognition and signaling, which are crucial for tissue formation and immune response.
- Providing a site for biochemical reactions and cell junctions which are important for tissue integrity and communication between cells.