Download PowerPoint- Cell Membrane Structure

Date: November 14, 2016
Aim #24: How does the structure of the cell membrane
contribute to its function?
Do Now: Please take out the worksheet from yesterday

HW:
1) Daily Review of class notes.
2) Castle Learning GRADED QUIZ due Thursday by
10:30PM
3) Unit 3 Test Tuesday 11/22 (period 5) Wednesday
11/23 (period 1)
Aim #24: How does the
structure of the cell membrane
contribute to its function?
1) What is the function of the
structure below?
CELL MEMBRANE
Its function is to
CONTROL what
enters and exits the
cell.
2) What is the cell membrane made
up of ?
◦Phospholipids
◦Proteins
3) What is a phospholipid?
◦ The cell membrane is composed of a
special type of lipid (fat) called a
phospholipid.
PHOSPHOLIPID
BI-LAYER
This part of the
phospholipid is
afraid of water
and tries to avoid
it.
phospholipids
4) What are types of proteins in the cell
membrane?
Membrane Proteins:
1. Structural Proteins:
2. Transport Proteins:
(Channels)
3. Receptor Proteins
4. Enzymes
STRUCTURAL
PROTEIN
CHANNEL
5) What are receptors?
RECEPTORS
Receptors found on the cell
surface aid in cell to cell
communication.
Messengers (hormones)
from other cells bind to
these receptors (based on
shape) and transfer
information.
Receptors on cell membrane are
involved in cell communication
Cell receptor
(receptor
molecule)
Signal 1 is released from
cell B and sent to cell A
Signal 2 is released by
cell A and sent to cell B
How is the cell membrane different
from an umbrella?
◦An umbrella is impermeable
It does not allow materials through
How is an umbrella different from a
window screen?
◦The window screen is permeable
It allows materials through
6) How is a window screen similar
to the cell membrane?
The cell
membrane is
permeable-it
allows materials
through
7) Do all things get through the cell
membrane?
NO!
8) The cell membrane is SELECTIVELY
PERMEABLE because it allows certain substances
through and prevents other substances from passing.
What is the difference between these
molecules?
Can the elephant get into the house?
Why do some things get through the
cell membrane?
◦Small molecules are
more likely to get
through the cell
membrane compared to
big molecules
9) What will get through the cell
membrane?
• Water
• Glucose
• CO2
• O2
• And other small
molecules
Protein
lipid
Lipid:
hydrophobic
tail
Lipid: hydrophilic head