Cells lesson
25 September 2013
11:14
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Audio recording started: 11:14 25 September 2013
What does diffuse mean?
Optical microscope
Electron microscope
This is an audio file recorded in a lesson with notes taken at the same time. Mouse over the points to go to that section of the recording
CELL THEORY
Cells are the basic unit of life. 
The Cell Theory states that:
1) All organisms made up of one or more cells and the products of  those cells.
2) All cells carry out life activities 
3) New cells arise only from other living cells  - process of cell division.
THE THREE MAIN COMPONENTS OF CELL ARE:
1. CELL MEMBRANE
Structure- a bilipid membraneous layer - of proteins and carbohydrates - fluid.
Function - the cell membrane separates the cell from external environment
Proteins are found embedded within the plasma membrane
Carbohydrates attached to proteins and lipids on the outer lipid layer.
2. CYTOPLASM
Structure - jelly-like - found between the cell membrane and nucleus.  
Makes up most of the "body" of a cell 
Function - Organelles are found here and substances like salts may be dissolved in the cytoplasm.
3. NUCLEUS
Structure - The largest organelle in cell - dark and round - surrounded by a double membrane called the nuclear envelope/membrane.  
Contains genetic information (DNA) on strands called chromosomes. 
Function - The "control centre" of the cell, for cell metabolism and reproduction.
Notes written and annotated by the student during a lesson
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