Chapter Five

Front 1

which of the following may affect the rate of diffusion

Back 1

all of the above

Front 2

bacterial cells are often found in very hypotonic environments. which of the following characteristics keep them from contuniuing to take on water from the enviroment

Back 2

the presence of a cell well allows a buildup of tonic pressure that prevents any more water from entering the cell

Front 3

sodium-potassim pumps are common in many cells. which of the following are necessary for the pumps to work

Back 3

ATP

Front 4

single-celled animals like amobas engul entire cells for food. which of the following represents the manner in which amoebas "eat"

Back 4

phagocytosis

Front 5

active transportt differs from passive transport in that active transport

Back 5

requires energy

Front 6

which of the following limits the movement of moleciles when carrie-mediated facilitated diffusion is involved

Back 6

all of the above

Front 7

channel proteins allow ions that would not normally pass thorough the cell membarane to pass through via the channel. what properties of the proteins are respnsible for this

Back 7

the channels are ofthen composed of polar amino acid groups

Front 8

which of the folowing statement regraidng osmosis is not true

Back 8

if osmois occurs across a membrane, then diffusion is not occuring

Front 9

in which of the following solution X hypotonic relative to soultion Y

Back 9

solution x has a lower slute concentration than soultion y

Front 10

if red blood cell with an internal salt concentation about .85 percent is placed in a saline solution that is 4 percent, which of the following will most likely happen

Back 10

the red blood cell will lososewater and shrivel

Front 11

you are moinotoring the diffuion of a molecule acoross a membrane. which of the following will resilt in the fastest rate of diffusion

Back 11

both a and b

Front 12

which of the following types of junctions are respnisibile for communication between cells

Back 12

gap junctions

Front 13

whcih of the following cell membrane componets serve as recognition signals for interactions between cells

Back 13

glycolipids or glycoproteins

Front 14

which of the following contributes to differnces in the two sides of the cell mebrane

Back 14

all of the aove

Front 15

which of the following statements regarding celluirla membranes is not true

Back 15

membrane phospholipids flip back and forth form one side of the bilayer to the other