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while water doesn't dissolve everything, molecules (like sugar) that enter into suspension are
cell are surrounded by this and among its myriad functions, serves as a selectively permeable membrane
selectively permeable membrane
it allows the passage of some materials and impedes the passages of others
when there is a difference in molecule concentration between two adjacent areas
the movement of molecules from an area of high concentration to an area of lower concentration
humans can't utilize saltwater as a source of water since it is so high in solutes, this is called
all life is subject to the tenents of selection, thus seeks to maximize energy efficiency and decrease energy expenditures, some types of transportation cost nothing for the cell
these proteins act as channels through which molecules that are too large or charged move, all without the expenditure of precious energy
there are some molecules that you really want in your cells, but must move __ a concentration gradient
for these molecules, you have to spend energy (in the form of ATP), takes precious energy away is called
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