Download Cell Boundaries - Deans Community High School

Chapter 2
Cell Boundaries
1) The Cell Wall
The cell wall is a non-living layer of Cellulose – a complex carbohydrate
consisting of unbranched chains of Glucose molecules grouped
together as Fibres.
Complete:
notes on structure of i) Primary Cell Wall
ii) Secondary Cell Wall
1
Chapter 2
Explain: how the cell wall helps to form a continuous water conducting
pathway in a plant.
2)
The Cell Membrane:
Investigation: What is the nature of the cell membrane?
The cell sap in the vacuole of a beetroot cell contains red pigment.
When the cell and vacuole membranes are damaged, “bleeding”
(escape| of red cell sap) occurs.
Method: Subject cylinder shapes of beetroot to the following
conditions. Remember that acid will denature protein molecules and
alcohol will dissolve phospholipid.
2
Chapter 2
Functions of the Plasma Membrane
Read
Activity 2.2 and make notes.
Active Transport:
Active Transport is the movement of molecules and ions across the
plasma membrane from a Low Concentration to a High
Concentration. i.e. Against a Concentration Gradient.
Active transport requires Energy as it is working in the opposite direction
to the passive process of diffusion.
Draw:
diagram figure 2.10
3
Chapter 2
Results:
complete
Conclusion: complete
Structure of the Cell Membrane:
Label the above diagram of the fluid mosaic model of the Plasma
Membrane (cell membrane).
Why is the plasma membrane referred to as
(i) Fluid:
(ii) Mosaic:
4
Chapter 2
Explain: with the aid of diagrams, the role of the plasma membrane in
Active Transport.
Conditions required for Active Transport
Complete:
5