17 terms

biology lab

water is reffered to this and it dissolves other things
while water doesn't dissolve everything, molecules (like sugar) that enter into suspension are
plasma membrane
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
concentration gradient
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
which water moves from an area of high to low concentration
humans can't utilize saltwater as a source of water since it is so high in solutes, this is called
we are this, (lower solute concentration), with respect to saltwater
if we drink something with the exact same amount of solute as us
passive transport
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
the more energy you have for other endeavors
the more passive transport you engage in,
facilitated diffusion
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
active transport
for these molecules, you have to spend energy (in the form of ATP), takes precious energy away is called
water exiting the plant cell, the result is a wilted, droopy, vegetative appendage
a red blood cell lacking the cell wall of a plant, has only a thin membrane preventing it from swelling to epic proportions before lysing as water enters the cell