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Transcript
Aim - To explain the fluid mosaic
model
Do Now:
Describe what is meant by a mosaic.
Articles
• http://biology.about.com/od/cellanatomy/ss/
cell-membrane.htm
• http://www.biology4kids.com/files/cell_mem
brane.html
Cell membrane
• Selective Permeability- the membrane is
“selective” it allows some substances in but
keeps others out.
Let me introduce you to ..
A phospholipid
Loves water
Phosphate group
(Hydrophilic)
Fatty acid chains
Hates water
(Hydrophobic)
Task-1
1. Work out how a load of phospholipids
would arrange themselves in a wet
environment.
Task-2
1. Work out how a load of phospholipids
would arrange themselves in a wet
environment.
2. Add some cholesterol within the
membrane
Task-2
1. Work out how a load of phospholipids
would arrange themselves in a wet
environment.
2. Add some cholesterol within the
membrane
Task-3
3. Add some proteins on either side and
through
Task-3
3. Add some proteins on either side and
through
Task-4
Add some sugars to some of the proteins
and some sugars to some of the fats
Task-4
Add some sugars to some of the proteins
and some sugars to some of the fats
Glycoprotein
Glycolipid
Outside
inside
Cell Membranes
Lesson-1
The Fluid Mosaic Model
Task-4
Add some sugars to some of the proteins
and some sugars to some of the fats
Glycoprotein
Glycolipid
Cell Membranes
Lesson-1
The Fluid Mosaic Model
Question
Could it look like a mosaic?
Glycoprotein
Glycolipid
Cell membranes
• https://www.youtube.com/watch?v=Pfu1DE9
PK2w
Activity
• Read Along- Reading Essentials
• Build a cell membrane with play-dohdemonstrate the fluid mosaic model
• Make sure you include the phospholipid
bilayer and the substances that can be found
floating in the membrane.
Regents Question
•
•
•
•
•
A function of cell membranes in humans is the
(1) synthesis of the amino acids
(2) production of energy
(3) replication of genetic material
(4) recognition of certain chemicals
Homework
• Explain the structure of the cell membrane
and the fluid mosaic model in a fully
developed paragraph.
Homework
The fluid mosaic model
The term fluid refers to the fact that
molecules move very freely within each layer.
Glycoprotein
Glycolipid
Molecules rarely change sides