Unit 2: Cell Membranes

AP Biology

selective permeability

cells only let certain things in or out. Maintains homeostasis by controlling movement of substances across the cell membrane

fluid mosaic model

describes the structure of the cell membrane as a mosaic of various proteins that float in or on the fluid lipid bilayer, allowing flexibility and movement.

amphipathic

having both hydrophilic and hydrophobic properties, enabling the formation of cell membranes.

proteins

essential macromolecules that perform a variety of functions in the cell, including facilitating transport across the membrane, serving as enzymes, and being involved in cell signaling.

cholesterol

a type of lipid that helps to stabilize cell membranes by reducing fluidity and permeability, playing a crucial role in maintaining membrane integrity.

glycoprotein/glycolipid

a protein with a carbohydrate chain covalently bonded, playing key rolls in cell to cell recognition, adhesion, and receptors on the cell surface