Lab 4: Osmosis and Diffusion

Question 1

What factors determine how fast water moves across a membrane?

Answer 1

Hydrostatic pressure
and
Solute concentration difference

Question 2

Plant cells are like red blood cells and can potentially burst when placed in solutions of varying tonicity.

true or false

Answer 2

false

Question 3

Which molecules can diffuse through a cell membrane?

Answer 3

small molecules

Question 4

Moving molecules against their concentration gradient requires what?

Answer 4

energy

Question 5

diffusion does or doesn’t require energy input

Answer 5

doesn’t

Question 6

What will happen when a red blood cell is placed in distilled water?

Answer 6

lysis will occur

Question 7

The movement of water molecules from a region of high free water concentration to a region of low free water concentration is known as ____________________

Answer 7

osmosis

Question 8

Tonicity is the measure of what

Answer 8

osmotic pressure

Question 9

The difference between dialysis tubing and real cell membranes is that

Answer 9

real membranes are more selective

Question 10

What will happen when a red blood cell is placed in a hypertonic solution?

Answer 10

The cell becomes shriveled

Question 11

is the movement of solutes through semipermeable membrane.

Answer 11

diffusion

Question 12

what direction do molecules go during diffusion

Answer 12

from high concentration to low concentration

Question 13

The difference in concentrations between adjoining regions is called a

Answer 13

concentration gradient

Question 14

moving against the concentration requires what

Answer 14

input of energy

Question 15

is the passive movement of water through a semipermeable membrane

Answer 15

osmosis

Question 16

how does water flow through osmosis

Answer 16

low solute concentration to high solute concentration

Question 17

in areas where there is little or no nondiffusible solute, most of the water molecules are

Answer 17

free and able to diffuse

Question 18

the measure of osmotic pressure

Answer 18

tonicity

Question 19

the pressure that exerted from the relative concentration of solution

Answer 19

tonicity

Question 20

areas of high solute concentration are what?

Answer 20

hypertonic

Question 21

areas of low solute concentration are what?

Answer 21

hypotonic

Question 22

situations that have the same solution concentrations within the cell and it’s surrounding environment are what

Answer 22

isotonic

Question 23

if you place a red blood cell in a hypertonic solution

Answer 23

the water would move put of the red blood cell and cause it to shrink

Question 24

What kind of solution is this?

Answer 24

Hypotonic

Question 25

What kind of solution is this?

Answer 25

Hypertonic

Question 26

What kind of solution is this?

Answer 26

Isotonic

Question 27

If you drop a red blood cell in a hypotonic solution what will happen

Answer 27

the cell will burst

Question 28

what does it mean to lyse

Answer 28

burst

Question 29

factors that determine how much/how
fast water flows across a membrane.

Answer 29

difference in solute concentration across the membrane.

and

the hydrostatic pressure on the membrane.

Question 30

the greater the difference in solute concentration the what the water will cross the membrane

Answer 30

faster

Question 31

the water pressure created as water moves into or
out of the cell.

Answer 31

hydrostatic pressure

Question 32

when plant cells are put in a hypotonic solutuon what happens

Answer 32

they become turgid

Question 33

when plant cells are put in a hypertonic solution what happens

Answer 33

the become flaccid