Hard
Selective permeability
some materials can pass through while others can not
phospholipid bilayer
Plasma membrane layers composed of phosholipid molecules arranged with polar header facing the outside
Transport Protein
Protein that moves substance through the plasma membrane
Fluid Mosaic model
a plasma membrane with components constantly in motion
Diffusion
net movement of particles from an area of higher concentration
Dynamic equilibrium
Condition of containers, random movement of particles
Facilitated diffusion
passive transport of ions and small molecules across the plasma membrane
Osmosis
diffusion of water across selecting piemable membrane
Hypertonic solution
a solution that has a higher concentration of soulte outsides
Isotonic solution
a solution with the same concentration of water and solutes as inside a cell resulting in the cell
Active transport
energy requiring process by which substance move across the plasma membrane
Hypertonic solution
a solution that has a higher concentration
Endocytosis
energy requiring process by which large substance
Exocytosis
energy requiring process by which a cell expells waste
atom
Block of matter contains subatomic particles neutrons protons and electrons
nucleus
center of an atom contains neutrons and protons
proton
positively charged particle in an atom nucleus
element
pure substance composed of only one type of atom cannot broken down into another substance by physical or chemical means
isotope
two or more atoms of the same element having different numbers of neutrons
compound
pure substance with unique properties formed when two or more different elements combine
covalent bond
type of chemical bond formed when atoms share electrons
molecule
compound whose alarms are held together by covalent bonds
ION
atom that is negatively or positively charged because it has lost or gained one or more electrons
ionic bond
electrail attraction between two oppositely charged atoms or groups of atoms
anatomy of a microscope
light, eye piece, nose piece, stage control, focus, light switch, and head