Chapter 6 Flashcards
plasma membrane
thin layer of lipids and proteins that separates the cell in its surroundings
bilayer
layer two molecules thick
cholesterol
predominant sterol in animal cells membranes
transport proteins
form channels that allow selected polar molecules and ions to pass through membrane
recognition proteins
identify a cell as part of the individual or foreign
receptor proteins
bind cells close together by recognizing and binding receptors or chemical groups on other cells or the ecm
glycolipids
lipid molecules with carbohydrate group attached
glycoproteins
carbohydrates being attached to protein in exterior facing lipid layer
glycocalyx
surface coat on cell membrane made of glycolipids and glycoproteins
fluid mosaic model
membrane consists of fluid phospholipid bilayer where proteins are embedded and float freely
integral proteins
proteins embedded in phospholipid layer
peripheral protenis
held to membrane by noncovalent bonds formed with polar parts of integral proteins or membrane lipids
freeze fracture technique
freezing a group of cells and then breaking the frozen piece to see the inside
transport
controlled movement of ions and molecules from one side of the membrane to another
passive-high to love
active-low to high
difficusion
net movement from high conc to low conc
concentration gradient
form of potential energy that drives diffusions
selectively permeable
membranes that allow, impede, or block certain molecule and ions from crossing the membrane