Download The Cell Membrane

9/27/2016
The Cell Membrane
Fluid Mosaic Model
What is the cell
membrane?
The outer boundary
of the cell
Biology
Explain how a cell
membrane is fluid.
Fluid because of
arrangement of the
phospholipids
Phospholipids have
heads that are
hydrophilic (like
water) and tails that
are hydrophobic (fear
water)
Phospholipids
arranged in a bilayer,
heads face the
outside and inside of
cell, the tails are in
the middle
Phospholipids are
close together but not
connected-this allows
them to be “fluid”
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9/27/2016
Explain how a cell
membrane is a
mosaic.
A mosaic is made up
of several small
pieces
Cell Membrane made
up of: bilayer of
phospholipids,
membrane proteins,
and cholesterol
What are the types of
membrane proteins?
1) Marker Proteins
ID tag, tells what kind
of cell it is and who it
belongs to
2) Receptor Proteins
Receive messages that
tell the cell what to do
Summary
3) Transport Proteins
Provide a channel
through which
molecules can enter
and leave the cell
A cell membrane can be considered fluid
because ...
A cell membrane can be considered a
mosaic because ...
The three types of proteins in the cell
membrane are ...
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