chapter 3.3,3.4,3.5 bio

selective permeability

allows some materials, but not all, to cross it, or permeate it

fluid mosaic model

describe the cell membrane

atp

energy

fluid mosaic model

layers can move and slide

selective permeability

lets only some materials through

phospholipid

made of three part: a phosphate group, a glycerol, and two fatty acid chains

cell membrane

separates the inside of the cell from the outside of the cell. it controls what comes into and goes out of the cell. has a double layer of phospholipids

endocytosis

takes in large materials or liquids

concentration gradient

the difference in the concentration of a substance from one location to another

osmosis

the diffusion of water molecules

diffusion

the movement of molecules from a place of higher concentration to a place of lower concentration

passive transport

the movement of molecules without a cell using energy

cell membrane

the package a cell comes in

active transport

the process of cells using energy to move molecules from an area of lower concentration to an area of higher concentration

exocytosis

the process that moves substances out of the cell

receptor

a protein that detects a signal or acts because of it

hypertonic

a solution that has a higher concentration of solutes than a cell

hypotonic

a solution that has a lower concentration of solutes than a cell

isotonic

a solution to a cell if it has the same concentration of solutes that the cell has

phagocytosis

a type of endocytosis in which the membrane grows out to surround large particles

receptor

only certain molecules will blind

facilitated diffusion

the process that transports proteins and give them a ride through the membrane. a helper