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.

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

cellular respiration

chemical reactions in plants and animals that break down food molecules into energy (ATP)

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

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

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