-Types of Solutions

-Facilitated Diffusion

-Active Transport

Bellwork1. What is diffusion?2. What is osmosis?3. Draw a picture of the same

concentration of solutes inside a cell as outside a cell.

4. Draw a hyper person.

Have data out and ready to hand in

Dialysis Tubing

Is also IMPERMEABLE to sucrose… Which is good, because I made a bunch of

sucrose solutions of different concentrations, and I can’t remember which is which.

Dialysis Lab – Your Job Objective: To determine which of the

unknown solutions is High, Medium and Low concentration.

Purpose: To observe the process of osmosis first hand and to use this process to understand how dialysis works.

Materials 3 Unknown colored solutions (High, Med

and Low Concentration) Water (150 mL) 3 beakers* 3 pieces of dialysis tubing* 3 pipettes Scissors Scale Paper towel

PROCEDURES: Watch demo, and write down procedures

Lab Title: Osmosis Lab (+ catchy title) Problem/Question: Does ______________ of

_________ in the bag affect the final ________ of the bag in ___ after in soaks in water.

Hypoth: if _________________ (color solution) has

(highest/lowest solute concentration) relative to the

Then _________________ As measured by __________

Data table: Mass of dialysis tubes in grams

COLOR INITIAL FINAL Difference High/Low/Med

RedBlueYellow

Diagram:Draw all 3 set ups at the start of the experiment and 15 minutes later.-Include particulate drawings showing H20, and sucrose molecules.-Label the solute and the solvent. -Use arrows to show the flow of water

Materials:

Procedures:

Data Table:

Qual. Observations

Graph: line/bar Conclusion

Names for concentrations:

Know Your Prefixes!!!Iso – sameHypo – LowHyper – High

Tonic – Liquid/Solution

Hypertonic Hyper= more/too much Higher concentration solution outside the

cell

Isotonic Iso= same Same concentration outside the cell as

inside

Hypotonic Hypo= less/too little Lower concentration solution outside the cell

Passive TransportOxygen and Carbon dioxide enter and leave the cell through simple diffusion

Passive Transport

Small unpolarized (not ions) molecules can pass through the cell membrane without a protein channel.

Slate Practice Lets revisit our salt water example

According to simple diffusion, draw what will happen here.

Slate Practice The solute will spread out until it is evenly dispersed.

Draw what happens to a cell with lots of solute in it, dropped in a beaker of pure H2O? Remember that the cell membrane is permeable to water but not solutes.

How does this work in cells?

Water follows solute into the cell… and the cell swells up.

How does this work in cells?

If it swells up too much, the cell can burst if the membrane gets pulled apart.

How does this work in cells?

FACILITATED DIFFUSION (another easy way – NO energy

required!)molecules Glucose, sodium ions and chloride ions need help (facilitated) getting across membrane

Carrier proteins help

Active TransportEnergy (ATP) required for movement.

Solutes are moved AGAINST the concentration gradient. (from low to high conc.)

Notes Check Look back at your notes for Passive and Active Transport.List two differences between passive transport and active transport.

Name one thing they have in common!

Active vs. Passive Transport Differences

Active Uses ATP- This is the energy source for the cell.

Active goes against the gradient Similar

Both have carrier proteins Both move molecules that cannot go through the

membrane on their own

Endocytosis- cell takes in substances Exocytosis- cell releases substances (out) ACTIVE TRANSPORT – requires ATP (energy)

How do cells move really large molecules in and out of the cell?

A portion of the cell membrane surrounds the desired molecule outside the cell.

The cell membrane rejoins pinching off a sac-like organelle called a vesicle.

There are 2 types of endocytosis: phagocytosis and pinocytosis.

Endocytosis

The reverse of endocytosisWastes and cell products are packaged by the golgi body in sacs called vesicles.

These vesicles fuse with the cell membrane and the materials are secreted out of the cell.

Exocytosis

Cellular Transport

Requires ______

Cellular Transport

Requires ______

Passive Transport: Diffusion:

Osmosis:

Hypertonic solution:

Hypotonic solution:

Isotonic solution:

Facilitated diffusion:

Glucose transport:

Active Transport:

Na+/K+ Pump:

Osmosis

Facilitated Diffusion

Glucose transportHypertonic

HypotonicIsotonic

Oxygen &Carbon Dioxide

Diffusion

Transport

PASSIVE

EndocytosisExocytosis

ACTIVE

Proteins and ATP

Na+/K+ Pump

Moves with

gradient

Moves against

gradient

ATP

Your Crazy Study Page For Mon’

Test

Don’t forget: Draw a

phospholipid bilayer with proteins and

carbohydrates (& their

functions)

Solution:Solute-particleSolvent-liquid

Diffusion OsmosisPassive vs. Active

ENDO EXO

1. What is the difference between active and passive transport?

2. LIST 2 kinds of passive transport.3. With a concentration gradient,

molecules move from areas of ____ concentration to areas of ____ conc.

4. During osmosis, if there is more salt inside the cell than outside, which way would water move?

Closure