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_membrane.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 (Hydrophilic) Phosphate group Hates water (Hydrophobic) Fatty acid chains

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 Glycolipid Glycoprotein Outside inside

Cell Membranes The Fluid Mosaic Model Lesson-1 Task-4 Add some sugars to some of the proteins and some sugars to some of the fats Glycolipid Glycoprotein

Could it look like a mosaic? Cell Membranes The Fluid Mosaic Model Lesson-1 Question Could it look like a mosaic? Glycolipid Glycoprotein

Cell membranes https://www.youtube.com/watch?v=Pfu1DE9PK2w

Activity Read Along- Reading Essentials Build a cell membrane with play-doh- demonstrate 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 Molecules rarely change sides The term fluid refers to the fact that molecules move very freely within each layer. Glycolipid Glycoprotein Molecules rarely change sides