AP BIOLOGY

Detailed explanation-1: -The main function of a semi-permeable membrane in cells is to separate the cell from the environment while allowing for the controlled transport of molecules in and out of the cell.

Detailed explanation-2: -Cell Membrane (Plasma Membrane) The cell membrane consists of a lipid bilayer that is semipermeable. The cell membrane regulates the transport of materials entering and exiting the cell.

Detailed explanation-3: -Water molecules and ions move through channel proteins.

Detailed explanation-4: -Semi-permeable membrane-A membrane through which only smaller molecules like water can pass but not the bigger molecules like solutes is known as semi-permeable membranes (SPM).

Detailed explanation-5: -The cell membrane controls what goes in and out by having protein channels that act like funnels in some cases and pumps in other cases. Passive transport does not require energy molecules and happens when a funnel opens in the membrane, letting molecules flow through.