Score- WORKSHEET 3.2 The Strueture of the Plasma Membrane Labot the structure of

Question

Score- WORKSHEET 3.2 The Strueture of the Plasma Membrane Labot the structure of the plasma membrano in the diagram below Puasphacte tar 8marks Diagram 3.1: The Fluid-mosaic Model The plasma membrane, according to the fluid-mosaic model is composed mainly of 1. , and protein. 2. Each phospholipid molecule consists of two parts: property with attracted to water A polar head that gives it a A pair of non-polar tails that give it a by water . e 3. In plasma membranes, phospholipids arrange themselves into two layers (bilayer) fliud. The hydrophilic heads of the outer layer face the The hydrophilic heads of the inner layer face the fluid. 4. The acts as a barrier which isolates the two sides of the membrane. 5. The phospholipid bilayer also contains which links the fatty acids together Cholesterol makes the plasma membrane stable, stronger, more flexible and less permeable to water-soluble substances such as ions. 6. 7. There are two different types of proteins. protein: the protein molecule that foms a channel or pore protein: the protein molecule that acts as a carrier Both proteins are referred to as transport proteins. a. Some membrane proteins lipids have branching carbohydrate chains attached to them on their outer surface form and glycolipids respectively [10 Marks WAJA BIOLOGY 2010 JPN PERAK

Explanation / Answer

1) phospholipids, cholesterol and proteins are components in plasma membrane according to Fluid mosaic model

2) hydrophilic property which are attached to water

   The phospholipid tails usually consists of 2 long fatty acid chains; they are hydrophobic and avoid interactions with water

3)   The inside layer is made of hydrophobic fatty acid tails and face inside Fluid

  the outer layer is made up of hydrophilic polar heads and face outside Fluid

4) The head acts as a barrier which isolates the two sides of the membrane

5) The phospholipid bilayer also contains cholesterol which links the fatty acids together

7) Channel Protein *referred to as transport protein

  Carrier Protein *referred to as transport protein

8) Recognition Protein

6) Importance of Cholesterol is that it makes plasma membrane stable, stronger, more flexible, and less permeable to water soluble substances such as ions

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