Mind Stretcher - Monday1. DNA of _____________ is found in the

nucleus of the cell. 2. Most of a cell’s ATP (energy) is made

and stored in the inner membrane of the ___________________.

3. Plants and animal cells have cell membranes, but the plant cell also has another outer layer called the _____________.

Eukaryotes

cell wall

mitochondria

Mind Stretcher - Monday1. DNA of _____________ is found as a

circular ring.

2. The outermost layer of a plant cell is the ________________ and is responsible for strength and support.

**Get out 1 sheet and title it “Cell Processes Notes”

Prokaryotes

cell wall

Cell Processes NotesCornell Notes

Background Info□Molecules are in constant motion,

and tend to move from areas of higher concentrations to areas of lesser concentration.

Cell ProcessesPassive Transport: the movement of

substances across a cell membrane without the use of energy by the cell.

Active Transport: the movement of substances across the cell membrane that requires the cell to use energy.

Define DiffusionThe movement of molecules from an

area of high concentration to low concentration.

(When they are really crowded…they want to spread out!)

Draw a diagram of an example of diffusion we saw in class.

Define osmosis□The diffusion of water or other water or other

particlesparticles across a selectively permeable membranemembrane.

Selectively permeable membrane

□A membrane that allows only certain materials to cross it

□Materials pass through pores in the membrane

http://www.usd.edu/~bgoodman/Osmos.htm

Define osmosis

Define osmosis□ In this picture a red blood

cell is put in a glass of distilled water (all water with no salt or sugar in it).  Because there is a higher concentration of water outside the cell, water enters the cell by OSMOSIS.  In this case too much water enters and the cell swells to the point of bursting open.  In the end pieces of cell membrane are left in the water.

http://www.usd.edu/~bgoodman/Osmos.htm

OSMOSIS

Why are osmosis & diffusion important?

Why are osmosis & diffusion important?

□All living things have certain requirements they must satisfy in order to remain alive – maintain homeostasis

□These include exchanging gases (usually CO2 and O2), taking in water, minerals, and food, and eliminating wastes.

□These tasks happen at the cellular level.

Passive Transport□Osmosis and Diffusion are types of

passive transport; this means that they do not need energy to move. (happen naturally)

Mind Stretcher 1. Materials move from areas of

_______ concentration to areas of ___________ concentration.

2. The Cell membrane is said to be ________________.

3. The process of absorbing sunlight and taking in carbon dioxide and water to make sugar and oxygen is called ____________.

Semi permeable

high

Photosynthesis

low

Cell Processes (review)Diffusion: the movement of particles

from regions of higher density to regions of lower density

Osmosis: the diffusion of water through a semipermeable membrane.

Active Transport□This requires energyenergy to move

molecules from low concentration to high concentration. (moving against what is natural)□Endocytosis: the process of bringing a

particle into the cell□Exocytosis: the process by which a

particle is removed from the cell

Summarizer□Osmosis and diffusion are similar in

that they both………., but osmosis …….., while diffusion…………………

Directions (Do this now!)□GET OUT 1 Sheet of paper & write

Cell Processes Check Up□Get out your notes from yesterday on

the Cell Processes□Read them SILENTLY at least two times

top to bottom□You may quietly quiz the person next to

you or across from you AFTER you’ve read your own 2 times!

Cell Processes Check Up1. The movement of particles from regions of

higher concentration to regions of lower concentration is called______________.

2. The diffusion of water through a semi-permeable membrane is called ____________.

3. Endocytosis means into or out of the cell?

4. Exocytosis means into or out of the cell?

5. True or False? : The movement of particles from less crowded to more crowded requires energy.

Gummy Bear Lab□Read the colored sheet (background

information)□Write your name on the white

Student Sheet□Write your Prediction based on what

you’ve read□Get out a Sharpie and write your

name on your cup

PROCEDURES□Use the ruler to measure the Height (cm) *How

tall is it?□Measure its Width (cm) *How wide is it?□Go find a balance along the countertop and

measure its MASS in grams. (g)□Write all this information in the BEFORE section of

your DATA Chart□Write descriptive/physical characteristics on the

chart□Fill your cup ½ way with water…place it to the

back right of the classroom (by windex)

Mind Stretcher- Copy ALL 1. Materials move from areas of

_______ concentration to areas of ___________ concentration. (diffusion)

2. The cell membrane is said to be ________________, letting only some things pass through pores.

Semi permeable

highlow

OR selectively permeable

Discuss Quiz Answers1. The movement of particles from regions of

higher concentration to regions of lower concentration is called______________.

2. The diffusion of water through a semi-permeable membrane is called ____________.

3. Endocytosis means into or out of the cell?

4. Exocytosis means into or out of the cell?

5. True or False? : The movement of particles from less crowded to more crowded requires energy.

DIFFUSION

OSMOSIS

Gummy Bear Osmosis- Day 2

□Safety note - do not eat the gummy bears after they have sat in the water. When you touch them with your fingers and drop them in the water, something else is added to the water and begins to grow - bacteria.

Gummy Bear Osmosis- Day 2□ When I call your table, come get your cup

□ Gently pour gummy bear onto petri dish□ Measure Height & Width in centimeters (cm)

**Try not to touch sticky bear with ruler□ Mass- FIRST push TARE or zero button with empty

petri dish on the electronic balance□Then gently place your gummy bear into it□Record the MASS in grams (g) on your sheet□Pour Gummy bear back into your cup and sit down

□ Write complete sentences for Lab Conclusion; Use notes & textbook to add details & support

Calculate Percent Change

□Fill in “BEFORE SOAKING” data for each of the three formulas (2nd and 3rd blanks)

Height: (________-________)/ _______x100= _____% Width: (________-________)/ _______x100= _____% Mass: (________-________)/ _______x100= _____%

2 cm 2 cm

1 cm 1 cm

2 g 2 g

Calculate Percent Change

□Fill in “AFTER SOAKING” data for each of the three formulas (2nd and 3rd blanks)

Height: (________-________)/ _______x100= _____% Width: (________-________)/ _______x100= _____% Mass: (________-________)/ _______x100= _____%

2 cm 2 cm

1 cm 1 cm

2 g 2 g

3 cm

2 cm

8 g

Subtract the first two #s…then divide that answer by your third blank & push =Then multiple by 100!

□ When gummy bears are made, gelatin and water are heated, just like making Jell-O. As the mixture cools, the water is drawn out of the bears and they harden to a chewy little bear. Gelatin is a long chain-like molecule that twists and forms a solid form. As the water is removed in the cooling process, the gelatin solidifies.

□ A solute is the dissolved material within another material. So the gummy bear is the solute in the water. The water is the solvent. When adding salt to water, the salt is the solute and the water is the solvent.

□ When the gummy bears are added to water, the water molecules will move into the bear by means of osmosis. Osmosis is the movement of solvent molecules (water) through a partially permeable membrane into an area of higher solute (gummy bear/gelatin) to equalize the solute concentration on both sides.

□There is less water and more gelatin inside the gummy bear. There is more water outside the gummy bear. The water doesn't want to be crowded, so some of the water molecules will move inside the gummy bear where there are fewer water molecules and a lot of gelatin molecules.

□The gummy bears started out with a lot of water but when they cooled and hardened in the candy factory, most of the water was removed.

□Finished with your Lab Write Up?□Work on the Egg-cellent Osmosis

reading comprehension sheet from yesterday

□Study your notes!!! □Make sure you have Ch. 4-1 HW finished □Ch. 4-2 HW is due Friday…with QUIZ

Password□1s face the screen□2s face their partner□1s: Look at next slide and give clues to

partner to have them guess each box Start at the bottom left

□Move to the next box if correct□Sit down when all 3 have been

guessed.

Password

Active Transport OsmosisSemipermeable

Membrane

Passive

TransportDiffusion

exocytosis

Password

Cell Membrane Nucleus Mitochondria

Cell Wall Photosynthesis

chloroplast

Mind Stretcher -1. In diffusion, __________move from areas

of ________ concentration to areas of __________ concentration.

2. In osmosis, _______ molecules move from areas of __________ concentration to areas of _____________ concentration.

3. What part of the cell do materials pass through to get into and out of the cell?

highlow

lowhigh

Cell Membrane

water

Particles/molecules

Mind Stretcher1. Tommy pours salt on a slug. It

shrivels up. Why?2. Plants draw water up from the soil,

through their roots to the leaves. How?

3. A man drinks a gallon of salt water everyday for a week and dies of dehydration. How does this happen?His organs are around 60% water. Drinking salt water draws water from his organs and into his digestive system. This leads to organ failure through osmosis!

There is a greater concentration of water in the ground or roots of the plant than in the leaves. This causes water to flow up the plant, called “osmotic pressure”.

The salt draws water out of the slug. (Osmosis)