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Do Now. 1. What is the smallest unit of life? 2. Circle the things that are alive from the following list : Dog Oven Algae Water Stars Trees Grass Bacteria Jellyfish Rocks Ocean 3. What are the common properties of cells ?

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do now
Do Now

1. What is the smallest unit of life?

2. Circle the things that are alive from the following list:

Dog Oven Algae Water Stars Trees

Grass Bacteria Jellyfish Rocks Ocean

3. What are the common properties of cells?

4. What is the main function of membranes?

monday tuesday august 19 20 2013
Monday/Tuesday, August 19/20, 2013

Your Learning Goal: Students will be able to relate the function of a cell membrane to a house and explain its importance in cell function

Table of Contents:1.2 Cell Membranes

Standard:1a: Cells function similarly in all living organisms

Agenda:

  • Do-Now: KWL chart
  • Notes: Cell Membrane
  • Group Station: Build a Membrane
  • Independent Station: Cell membrane Worksheet
  • Exit Slip

Homework:

Finish Cell Membrane Worksheet

what is a cell membrane
What is a cell membrane?

1. The cell membrane is made up of a phospholipid bilayer with proteins inside

2. The cell membrane surrounds and protects the Cell

3. The cell membrane is selectively permeable

oil and water demonstration
Oil and Water demonstration
  • Oil is Hydrophobic
i h ydrophilic and hydrophobic
I. Hydrophilic and hydrophobic
  • What do you think Hydro- is?
    • What hydrates you during sports practice?
  • What do you think -phobic means
    • Arachnophobic: fear of spiders
    • Acrophobia- Fear of heights.
    • Claustrophobic: Fear of small paces
  • What do you think –philic means?
    • Bibliophilic: love for books
    • Francophilic: Love of France
i hydrophilic and hydrophobic
I. Hydrophilic and hydrophobic
  • Hydrophobic: Hates water
  • Hydrophilic: Loves Water
ii phospholipids
II. Phospholipids
  • Membranes are made up of molecules called phospholipids.
  • Phospholipidsare fatty acids that make up membranes
  • Phospholipids have a hydrophilic head and a hydrophobic tail
  • Fat cells, called adipocytes, in your body are cells just made of phospholipids!

Hydrophilic Head

 Mixes w/ water

Hydrophobic tale

“HATES” water 

phospholipid cfu
Phospholipid CFU

What does hydrophobic mean?

What does hydrophilic mean?

What’s another name for phospholipids?

iii phospholipid arrangement

Water outside the cell

III. Phospholipid arrangement
  • Membranes are formed by a phospholipid bilayer
  • Phospholipid Bilayer: A two sided layer of phospholipids with the hydrophilic tails in the middle and the hydrophobic heads on the outside

No Water

Water inside the cell

cell plasma membrane
Cell/Plasma membrane

Heads are Hydrophobic-does not like water

Tails are Hydrophilic-likes water

cell membrane
Cell Membrane
  • The cell membrane has three main jobs:
    • Keep good stuff in and bad stuff out
    • Separates cells from the outside
    • Protect cells from the environment
i selective permeability
I. Selective permeability:
  • the process of allowing some molecules to pass into the cell while keeping others out
ii proteins are tunnels through the membrane
II. Proteins are tunnels through the membrane
  • Proteins let molecules that can’t fit through the lipids into and out of the cell
  • Proteins in the membrane select which large molecules come in and out
  • Proteins are like the the doors and windows of the house
slide22
The plasma membrane (cell membrane) is made of two layers of phospholipids. The membrane has many proteins embedded in it.
  • The plasma membrane regulates what enters and leaves the cell. Many molecules cross the cell membrane by diffusion and osmosis
question 1
Question 1

What term means that membranes are made up of two back-to-back layers?

a) selective permeability

b) non-polar tails

c) bilayer

d) phophate

question 2
Question 2

Which part of the diagram below is hydrophilic?

a) A

b) B

c) Both A and B

d) Neither A nor B

A

B

question 3
Question 3

Which part of the diagram below would not mix well with water?

a) A

b) B

c) Both A and B

d) Neither A nor B

A

B

question 4
Question 4

Which part below will end up in the middle of a bilayer?

a) A

b) B

c) Both A and B

d) Neither A nor B

A

B

slide27

A

B

question 41
Question 4

In what types of organisms are cell membranes found?

a) prokaryotes

b) eukaryotes

c) bacteria

d) all of the above