Transcript Notes PPT

Please DO NOT TOUCH Lab Equipment
WRITE THE CRITICAL QUESTION AND
THE LEARNING GOAL.
CRITICAL QUESTION: HOW IS A
PLASMA MEMBRANE LIKE A
WINDOW SCREEN?
Structures of the Cell Membrane
ProteinProteins
Carbohydrate
Carbohydrate
(chain)
(chain)
Phospholipid
Bilayer
Protein
Proteins
Phospholipi
Protein
d
Plasma Membrane

Function
 Flexible
boundary of a
cell that separates itself
from its surrounding
 Maintains homeostasis
 By


 Small
molecules
 Hydrophilic
 Nonpolar molecules
being semi permeable
Selective Permeability
what
molecules, ions, etc.
enters the cell
Some molecules can pass
through anytime

 Controlling

Some molecules are
never allowed
Some molecules need
channels or carrier
proteins
Phospholipids
Phospholipid
“attracted to water”
Made of a
1. glycerol head,
2. phosphate
group, and
3. Two fatty
acid tails

phosphate
lipid
“repelled by water”
Phospholipid Bilayer

Double layered sheets
of phospholipids
Protein Channels



Come in a variety of different shapes and sizes
This makes it possible for a cell membranes to be
“selective”
molecules
have to
Some molecules can easily pass through Some
certain
channels
pass through their “specific”
(resemble something like a straw)
protein channel that
specifically fits their shape
Directions: You are
going to complete a
series a 3 separate
activities.
Once you have finished
each activity,
summarize and
illustrate what you saw
on your observation
sheet.
At the bottom of the
page, draw and label
your own plasma
membrane.
When finished tape or
glue your observation
sheet onto the left
hand side of you
membrane notes.
How to make the bubble holder