Warm-Up #5Warm-Up #51)1) What organelle is semi-permeable?What organelle is semi-permeable?

2)2) What organelle acts as UPS and What organelle acts as UPS and “fixes” by packaging and sending “fixes” by packaging and sending proteins?proteins?

3)3) What is the function of the nucleus?What is the function of the nucleus?

Diffusion and OsmosisDiffusion and Osmosis

Cell Membrane – Security Cell Membrane – Security GuardGuard• The cell membrane The cell membrane

is semi-permeableis semi-permeable

• It only allows It only allows certain materials in certain materials in and out of the celland out of the cell

DiffusionDiffusion

• Diffusion is the Diffusion is the process in which process in which small materials small materials such as oxygen such as oxygen move in and out of move in and out of the cell.the cell.

How Does Diffusion How Does Diffusion Happen?Happen?

• Diffusion of Diffusion of materials occurs materials occurs when one when one substance moves substance moves from ____________ from ____________ concentration to concentration to _____________ _____________ concentration.concentration.

http://zoology.okstate.edu/zoo_lrc/biol1114/tutorials/Flash/Osmosis_Animation.htm

High

Low

EQUILIBRIUMEQUILIBRIUM

• Materials move Materials move from areas where from areas where there is a lot of there is a lot of substance to areas substance to areas where there is little where there is little substance until substance until both sides are atboth sides are atEQUILIBRIUM

OSMOSISOSMOSIS

• Osmosis is the Osmosis is the process in which process in which water enters and water enters and leaves the cellleaves the cell

OsmosisOsmosis

• In Osmosis, water In Osmosis, water goes from low to goes from low to high ion high ion concentrationconcentration

• An ion is saltAn ion is salt

HypertonicHypertonic

• If there are more If there are more ions outside of the ions outside of the cell than inside, the cell than inside, the water moves out!water moves out!

• The solution is The solution is hypertonichypertonic

HypotonicHypotonic

• If there are more If there are more ions inside the cell, ions inside the cell, than outside, water than outside, water rushes in!rushes in!

• The solution is The solution is HypotonicHypotonic

IsotonicIsotonic

• If there is the same If there is the same amount of ions amount of ions inside and outside inside and outside of the cell, osmosis of the cell, osmosis doesn’t happendoesn’t happen

• The cell is isotonicThe cell is isotonic

QuestionQuestion

A cell is placed in a 50% salt solution. A cell is placed in a 50% salt solution. What will happen to the cell? Assume What will happen to the cell? Assume the cell is 1% salt. Show arrows and the cell is 1% salt. Show arrows and label hyepertonic and/or isotonic.label hyepertonic and/or isotonic.

Inside Cell

__% Water ___% salt

Outside cell

___% water

___% salt199

50

50

Water goes out

hypertonic

QuestionQuestion

A cell is placed in a 20% salt solution. A cell is placed in a 20% salt solution. What will happen to the cell? Assume What will happen to the cell? Assume the cell is 30% salt. Show arrows and the cell is 30% salt. Show arrows and label hyepertonic and/or isotonic.label hyepertonic and/or isotonic.

Inside Cell

__% Water ___% salt

Outside cell

___% water

___% salt3070

80

20

Water goes in

hypotonic

Quiz!Quiz!

Number 1-8 on page ________Number 1-8 on page ________

1. Semi-permeable means1. Semi-permeable means

a.a. The membrane lets all things in but The membrane lets all things in but nothing out of the cell.nothing out of the cell.

b.b. The membrane lets some things in The membrane lets some things in and some things out of the cell.and some things out of the cell.

c.c. The membrane lets nothing in and The membrane lets nothing in and nothing out of the cell.nothing out of the cell.

d.d. The membrane lets everything in The membrane lets everything in but nothing out of the cell.but nothing out of the cell.

2. Substances move2. Substances move

a.a. From low concentration to high From low concentration to high concentrationconcentration

b.b. From left to rightFrom left to right

c.c. From high concentration to low From high concentration to low concentrationconcentration

d.d. From right to leftFrom right to left

3. Molecules will move 3. Molecules will move through the membrane untilthrough the membrane until

a.a. There are no more substances on There are no more substances on the outsidethe outside

b.b. The inside is fullThe inside is full

c.c. Equilibrium is reachedEquilibrium is reached

d.d. None of the aboveNone of the above

4. 4.

The yellow dots willThe yellow dots will

a.a. Stay where they areStay where they are

b.b. Move into the cellMove into the cell

c.c. Move in and out of the cellMove in and out of the cell

d.d. Move out of the cellMove out of the cell

5. Osmosis is5. Osmosis is

a.a. Water moving from low to high Water moving from low to high concentrationconcentration

b.b. Water moving in and out of the cellWater moving in and out of the cell

c.c. Toxins moving out of the cellToxins moving out of the cell

d.d. Oxygen moving in and out of the Oxygen moving in and out of the cell.cell.

6. Hypertonic means6. Hypertonic means

a.a. Water moves out of the cellWater moves out of the cell

b.b. Water moves into the cellWater moves into the cell

c.c. Water moves in both direction Water moves in both direction equallyequally

d.d. Water does not moveWater does not move

7. Hypotonic means7. Hypotonic means

a.a. Water moves out of the cellWater moves out of the cell

b.b. Water moves into the cellWater moves into the cell

c.c. Water moves in both direction Water moves in both direction equallyequally

d.d. Water does not moveWater does not move

8. isotonic means8. isotonic means

a.a. Water moves out of the cellWater moves out of the cell

b.b. Water moves into the cellWater moves into the cell

c.c. Water moves in both direction Water moves in both direction equallyequally

d.d. Water does not moveWater does not move

Time to set-up your lab!Time to set-up your lab!

• Write your hypothesisWrite your hypothesis

• Write ProceduresWrite Procedures

• Create data tableCreate data table

• Later you will perform conclusionLater you will perform conclusion