THE PLASMA MEMBRANE
When is facilitated diffusion necessary? When the molecules are too large. When the molecules are insoluble. When the direction of movement is opposite to natural diffusion. none of the above
When the molecules are insoluble.
cellular respiration
chemical reactions in plants and animals that break down food molecules into energy (ATP)
diffusion
movement of particles or molecules from higher concentration to lower concentration
Glucose will pass through a cell membrane with the aid of
proteins
osmosis
the diffusion of water across a semipermeable membrane
adenosine triphosphate
the high energy chemical compound with three phosphate groups that provides energy for all other cell activities; (ATP)
homeostasis
the relatively constant state in the internal environment of an organism
protein
a large, complex organic molecule consisting of a large number of amino acids linked together by peptide bonds
polar molecule
a molecule that has partial positive and negative charges at each end
phospholipid
a molecule with polar and nonpolar ends that, along with protein, makes up the plasma membrane
hypertonic
a solution that has a higher salt concentration than the salt concentration inside the cells
hypotonic
a solution that has a lower salt concentration than the salt concentration inside the cells
isotonic
a solution with the same salt concentration as the salt concentration inside the cells
This transportation process requires the cell to move particles from low concentration to high concentration. active transport facilitated diffusion osmosis diffusion
active transport
A plasma membrane and a cell wall _____. have the same structure and different functions have different structures and the same function are two names for the same thing have different structures and different functions
have different structures and different functions
phagocytosis
when cells eat other cells or large substances
pinocytosis
when cells eat small or dissolved substances
endocytosis
when cells engulf or ingest substances
exocytosis
when cells expel or get rid of substances from within