20 terms

Cell Processes

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Passive Transport
cell processes that do not use energy; substances move from a high to low concentration.
Diffusion
a type of passive transport; particles move from a high concentration to a low concentration without using energy
Osmosis
the diffusion of water into or out of a cell membrane.
Equilibrium
when the concentrations of substances become equal. This happens during diffusion. Also called homeostasis.
Active Transport
cell processes that require energy; substances move from a low to high concentration.
Osmosis & Diffusion
two types of passive transport
Endocytosis & Exocytosis
two types of active transport
Endocytosis
the process by which a cell membrane surrounds a particle and encloses the particle in a vesicle to bring the particle into the cell
Exocytosis
the process by which a cell releases a particle by enclosing it in a vesicle to release the particle.
ATP (adenosine triphosphate)
another name for an energy carrying molecule
Low Concentration
when molecules are less crowded
High Concentration
when molecules are more crowded
Osmosis
diffusion of water molecules only through a membrane
Diffusion
movement of substances from an area of higher concentration to an area of lower concentration
Cell Transport
movement of molecules across a cell membrane from an area of lower concentration to one of higher concentration
Selectively Permeable Membrane
selectively permeable membrane allows small, soluble molecules to pass through it, but prevents large insoluble molecules from passing through.
Prokaryote
bacteria, no nucleus, no membrane bound organelles
Eukaryote
organized membrane bound organelles, nucleus
DNA
contains the instructions for the development and function of living things
Cell Membrane
regulates what materials enter and exit the cell
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