Cell Membrane
77
10/20/15
EQ: How does structure
relate to function in living
systems from the organismal
to cellular level?
Starter:
How do passive and active
transport help a cell maintain
homeostasis?
Practice:
Glue notes here
Cell Membrane
78
10/20/15
Application/Connection/Exit
https://www.youtube.com/watch?v=6fhbbFd4icY
Watch video and write 5 facts.
1.
2.
3.
4.
5.
Then complete review sheet.
Answer questions on exit slide on
back. Turn in.
Agenda
•1. Starter
•2. notes
•3. Video Review
•4. Exit
Table of Contents
Date
Lecture/ Activity/ Lab
10/8
Cell Comparisons
10/9
Cell Writing
10/13 Eukaryotic and Prokaryotic Cells
10/14 Eukaryotic and Prokaryotic Poster
10/15 Osmosis in Eggs
10/16 Osmosis Lab Day II and Quiz
10/19 Osmosis Lab Day III
10/20 Cell Membrane
Page
61-64
65-66
67-68
69-70
71-72
73-74
75-76
77-78
Cell Membrane
A cell
membrane
has 3 main
functions
Functions
1. Controls what enters / exits cell.
2. Protects cell.
3. Supports cells.
Cell membrane surrounds cell.
Cell Membrane
A cell
membrane is
made of 3
types of
organic
molecules
Structure
1. Phospholipid bilayer
2. Proteins (integral and peripheral)
3. Carbohydrates
Cell Membrane
Phospholipid
bilayer
Most of a cell membrane is made of a
phospholipid bilayer
a) Double layer of phospholipid molecules.
b) Fluid and flexible.
c) Allows some small, non-polar molecules
through, but blocks large or charged
molecules.
Cell Membrane
Phospholipid
molecules have
a “head” and a
“tail”
Phospholipid molecules arrange themselves into
bilayer because of their special structure.
Hydrophilic
head “loves”
water.
Hydrophobic
tail “fears”
water.
Cell Membrane
Integral and
peripheral
proteins
Proteins are attached to phospholipid bilayer
and perform many functions:
a) Integral proteins are attached to membrane.
They can transport materials or carry signals in
and out of the cell.
b) Peripheral proteins temporarily attach to
phospholipid bilayer or integral proteins.
Cell Membrane
Carbohydrates
Some carbohydrate chains are attached to the
membrane surface. These help cells identify
and recognize each other.
Cell Membrane
Cell Wall
A cell wall is a hard, flexible extra layer
surrounding the cell membrane in some
organisms, including:
 Plants
 Fungi
 Some bacteria
Exit : Write on back of Review worksheet
1. Summarize the main functions of a cell membrane and why
is this important.
The main functions of a cell membrane include…
This is important because…………….
2. List and illustrate the main structures of a cell membrane,
in terms of phospholipids, proteins and carbohydrates.
The main structures of a cell membrane includes…
Illustration of cell membrane: …
3. Compare and contrast cell membranes to cell walls.
In comparison, a cell membrane and cell wall both _______________________. In
contrast, a cell membrane is _____________________________________________,
while a cell wall is ___________________________________________________________.
Cell Membrane
77
10/20/15
EQ: How does structure
relate to function in living
systems from the organismal
to cellular level?
Starter:
How do passive and active
transport help a cell maintain
homeostasis?
Practice:
Glue notes here
Cell Membrane
78
10/20/15
Application/Connection/Exit
https://www.youtube.com/watch?v=6fhbbFd4icY
Watch video and write 5 facts.
1.
2.
3.
4.
5.
Then complete review sheet.
Answer questions on exit slide on
back. Turn in.