HAPPY MONDAY!!Bellwork:

Draw a representation of the picture below. Use your drawing to explain why it is important for

cells to be small.

ACTIVITY:

Open your journals Set up page number ____ for Cornell Notes Your first entry on the left hand side should be

“Observations”. You should all have a set of random objects at

your tables. For the next 7 minutes you will explore and

record as many observations as you can about the items at your table. (CHAMP)

Write down ANYTHING you observe. There are no right or wrong answers.

TODAY’S ESSENTIAL QUESTION

What is a membrane and what is it’s purpose?

What did you observe in the activity and how does it relate to the essential question?

ALL CELLS ARE SURROUNDED BY A THIN, FLEXIBLE BARRIER KNOWN AS A

CELL MEMBRANE.

WHAT IS THE CELL MEMBRANE’S

FUNCTION (JOB)?

(2 THINGS)

THE TWO MAIN FUNCTIONS ARE:

1) TO REGULATE WHAT ENTERS AND LEAVES THE CELL

2) TO PROVIDE PROTECTION AND SUPPORT.

MEMBRANES FALL INTO THREE CATEGORIES…

They can be permeable, meaning that the membrane is penetrable and will allow liquids, particles and gasses to pass through it.

Which of the objects from the activity were completely permeable?

They can be impermeable, meaning that the membrane is not penetrable and will NOT allow liquids, particles or gasses to pass through it.

Which of the objects from the activity were completely impermeable?

Finally, they can be Selectively permeable, meaning that some substances can pass across while others cannot.

Biological membranes, like the ones around your cells, are selectively permeable.

Which of the objects from the activity were selectively permeable?

WHAT IS THE CELL MEMBRANE MADE (COMPOSED) OF?

(3 TYPES OF MOLECULES)

The cell membrane is composed of a double-layered sheet called a lipid bilayer.

DRAW THIS!

Lipid

Phosphate

carbohydrate

Bi- means 2

Also called the phospholipid bilayer

PROTEINS ARE EMBEDDED IN THE LIPID BILAYER. Proteins form channels or pumps that help move

large materials across the cell membrane.

Carbohydrates are attached to many proteins embedded on the outside of the bilayer.

The carbohydrates allow individual cells to identify one another.

HAPPY TERRIFIC TUESDAY TO YA!!!

Bellwork: Draw the picture below and label the essential parts we discussed yesterday.

QUICK RECAP!Why do molecules move?

How do molecules move?1. Concentration gradient

What is it? How does it affect how molecules

move?

2. Types of solutions: Isotonic Hypertonic Hypotonic

ESSENTIAL QUESTION: WHAT IS THE PROCESS OF DIFFUSION? WHAT IS THE PROCESS OF OSMOSIS?

AND HOW DOES IN THE WORLD DOES IT RELATE TO WHAT WE’VE BEEN TALKING ABOUT?

Diffusion: when particles move from an area of high concentration to an area of low concentration.

Osmosis: diffusion of WATER through a selectively permeable membrane

Remember: SALT SUCKS

When the concentration of a solute is the same throughout a system, the system has reached equilibrium.

When equilibrium is reached, particles do continue to move across the membrane.

MOLECULE TRANSPORT VOCAB

DID HOMEWORK Concentration

gradient Hypotonic Hypertonic Isotonic Diffusion Osmosis Equilibrium Create a concrete

spelling for 3 of the words (color)

DIDN’T DO HOMWORK

Pg 201 (diffusion), 204-205 (hypo/hyper/iso)

  Questions #2 and 3 on

page 207

BELLWORK

You’ll have 5 minutes to finish your concrete spelling OR bookwork from yesterday

Pg 201 (diffusion), 204-205 (hypo/hyper/iso) Questions #2 and 3 on page 207

SCIENCE FACT OF THE DAY Salt water is 4 times saltier than our blood. By

drinking it, your kidneys would need to use up a large amount of water just to get rid of all that excess salt. This means that you would actually die of thirst from drinking seawater.

Osmosis with Gummi BearsPurposeTo investigate the movement of water into and out of a semi-permeable membrane

Hypothesis: If the Gummi Bear is placed into an isotonic solution, then it will ____________ in mass. If the Gummi Bear is placed into a hypertonic solution, then it will ____________ in mass.If the Gummi Bear is placed into a hypotonic solution, then it will ____________ in mass. Materials•(1) Gummi Bear, (1) plastic cups, Paper towels•Triple beam balance•Permanent marker

Procedure1. Obtain 1 plastic cup and 1 bear.2. On the side of the cup, write your group name using a

permanent marker.3. Find the mass of each bear using a balance. Record the data

in the data table.4. Measure your bear from top to bottom (height), from side to

side (width) and from front to back (length). Use your measurements to calculate the volume. Record your data in the data table.

5. Place the bears in the cups.6. Pour either solutions A or B into the cup. Pour enough

solution in the cups to fully cover the bears (1/2 cup full).7. Place the cup on your tray and let them soak overnight.8. On the next lab day, gently remove the bears from the

solution.9. Gently blot the bears dry by placing them on a paper

towel.10. Measure the bear.11. Find the mass of the bear. Do this by placing the bear

on the balance. Record the total mass. Carefully slide the bear back into the empty cup.

DATA TABLE

Bear in solution __

Length (cm)

Width (cm)

Height (cm)

Volume (cm3)

Mass (g)

Day 1 1 cm 1 cm 2 cm 2 cm3 2.67g

Day 2

Change

CONCLUSION (ON YOUR TABLE)

Each blank is numbered, fill in the word for the number

DON’T copy the whole thing

AnalysisWhat type of solution was your bear in?

(Justify your answer)Explain how a cell maintains homeostasis

using osmosis.

SOLUTION TYPES WITH CHIPS…

Homework https://www.youtube.com/watch?v=QnLIwW8zskM

Facilitated Diffusion Alyssa Dolny