Lab 4: Osmosis and Diffusion Flashcards

1
Q

What factors determine how fast water moves across a membrane?

A

Hydrostatic pressure
and
Solute concentration difference

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2
Q

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

true or false

A

false

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3
Q

Which molecules can diffuse through a cell membrane?

A

small molecules

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4
Q

Moving molecules against their concentration gradient requires what?

A

energy

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5
Q

diffusion does or doesn’t require energy input

A

doesn’t

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6
Q

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

A

lysis will occur

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7
Q

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

A

osmosis

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8
Q

Tonicity is the measure of what

A

osmotic pressure

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9
Q

The difference between dialysis tubing and real cell membranes is that

A

real membranes are more selective

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10
Q

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

A

The cell becomes shriveled

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11
Q

is the movement of solutes through semipermeable membrane.

A

diffusion

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12
Q

what direction do molecules go during diffusion

A

from high concentration to low concentration

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13
Q

The difference in concentrations between adjoining regions is called a

A

concentration gradient

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14
Q

moving against the concentration requires what

A

input of energy

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15
Q

is the passive movement of water through a semipermeable membrane

A

osmosis

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16
Q

how does water flow through osmosis

A

low solute concentration to high solute concentration

17
Q

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

A

free and able to diffuse

18
Q

the measure of osmotic pressure

19
Q

the pressure that exerted from the relative concentration of solution

20
Q

areas of high solute concentration are what?

A

hypertonic

21
Q

areas of low solute concentration are what?

22
Q

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

23
Q

if you place a red blood cell in a hypertonic solution

A

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

24
Q

What kind of solution is this?

25
What kind of solution is this?
Hypertonic
26
What kind of solution is this?
Isotonic
27
If you drop a red blood cell in a hypotonic solution what will happen
the cell will burst
28
what does it mean to lyse
burst
29
factors that determine how much/how fast water flows across a membrane.
difference in solute concentration across the membrane. and the hydrostatic pressure on the membrane.
30
the greater the difference in solute concentration the what the water will cross the membrane
faster
31
the water pressure created as water moves into or out of the cell.
hydrostatic pressure
32
when plant cells are put in a hypotonic solutuon what happens
they become turgid
33
when plant cells are put in a hypertonic solution what happens
the become flaccid