Section 7.4: Cellular Transport

Question 1

diffusion

Answer 1

the net movement of particles from an area where there are many particles of the substance to an area where there are fewer particles of the substance

Question 2

dynamic equilibrium

Answer 2

the condition in which there is continuous movement but no overall change

Question 3

facilitated diffusion

Answer 3

the process of moving transport proteins to move other ions and small molecules across the plasma membrane

Question 4

osmosis

Answer 4

the diffusion of water across a selectively permeable membrane

Question 5

isotonic solution

Answer 5

a solution that has the same concentration of water and solutes– ions, sugars, proteins, and other substances– as its cytoplasm

Question 6

hypotonic solution

Answer 6

a solution that has a lower concentration of solute

Question 7

hypertonic solution

Answer 7

the concentration of the solute outside of the cell is higher than inside

Question 8

active transport

Answer 8

the movement of substances across the plasma membrane against a concentration gradient, requiring energy

Question 9

endocytosis

Answer 9

the process by which a cell surrounds in the outside environment, enclosing the substance in a portion of the plasma membrane

Question 10

exocytosis

Answer 10

the secretion of materials at the plasma membrane