Final answer:
The statement is true; the cell membrane's selective permeability and role in maintaining homeostasis are primarily due to its phospholipid bilayer structure.
Step-by-step explanation:
The statement that the selective permeability of the cell helps maintain homeostasis within the cell, and that the membrane's structure is mostly attributed to phospholipids is A) True. The cell membrane is composed of a bilayer of phospholipid molecules that create a barrier between the cytoplasm inside the cell and the environment outside the cell. This phospholipid bilayer is crucial for this selectivity, allowing only certain substances to pass in or out, ensuring that the necessary balance for cellular function is maintained.
The membrane's lipid bilayer is tightly packed, featuring hydrophobic internal lipid tails and hydrophilic external phosphate heads. Additionally, cholesterol within the membrane contributes to its fluidity, which is essential for its function. Various proteins embedded within the bilayer also play a part in its selective permeability, enabling transport and signaling processes. In summary, the cell membrane's structure, which is prominently made up of phospholipids, is integral for its function as a regulator of the cell's internal environment, supporting the dynamic homeostasis necessary for the survival of the cell and, ultimately, the organism.