AP BIOLOGY

Detailed explanation-1: -Cytoplasm forms the outer boundary of a cell and controls material moving in and out of the cell.

Detailed explanation-2: -Cell membrane It maintains the integrity of a cell and controls passage of materials into and out of the cell. All materials within a cell must have access to the cell membrane (the cell’s boundary) for the needed exchange. The cell membrane is a double layer of phospholipid molecules.

Detailed explanation-3: -The cell membrane, also called the plasma membrane, is found in all cells and separates the interior of the cell from the outside environment. 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-4: -There are integral membrane proteins called transporters that mediate movement of molecules that are too polar or too large to move across a membrane by diffusion. In order to accomplish this, a solute (molecule to be transported) binds to a specific site on a transporter on one surface of the membrane.

Detailed explanation-5: -The plasma membrane is the border between the interior and exterior of a cell. As such, it controls passage of various molecules-including sugars, amino acids, ions, and water-into and out of the cell.