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generalization that all living things are composed of cells, and that cells are the basic unit of structure and function in living things
thin outer boundary of a cell that regulates the traffic of chemicals between the cell and its surroundings
new movements of the particles of a substance from where they are more concentrated to where they are less concentrated
point at which the number of diffusing molecules moving in one direction is equal to the number of moving in the opposite direction
selectively permeable membrane
membrane that allows some substances to pass more easily than others and blocks the passage of some substances altogether
diffusion across a membrane requiring only the random motion of molecules with no energy expended by the cell
pathway provided by transport proteins that helps certain molecules pass through a membrane
movement of molecules across a membrane requiring energy to be expended by the cell
process of taking material into a cell within vesicles that bud inward from the plasma membrane
network of membranes within a cell's cytoplasm that produce a variety of molecules
membrane-bound sac containing digestive enzymes that can break down proteins, nucleic acids, and polysaccharides
organelle found in some plant cells and certain unicellular organisms where photosynthesis takes place
straight, hollow tube of proteins that gives rigidity, shape, and organization to a cell
solid rod of protein, thinner than a microtubule, that enables a cell to move or change shape
long, thin, whip-like structure, with a core of microtubules, that enable some cells to move
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