Cells

Below you can find the assessment statements that will determine your progress in this unit:

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We will begin by looking at Cell Theory.

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A brief timeline of the development of the Cell Theory is shown below:



A comparative selection of powerpoints will help to illustrate the differences between prokaryotes and eukarotes:

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A closer look at the organelles of the eukaryotic cell is provided in the links below:

[|Cell structure] [|Wiley Cell Structure]

A good animation to investigate the organelles alone is provided here:

[|Cell organelles]

So, we know that our bodies are made up from cells. You should also be aware that different tissues in your body are comprised of different types of cells. If we consider that all the cells in your body from from one original zygote (fertilised egg)... from one single type of cell. How did that one cell become many different types of cells. The answer is by the processes of cell division and differentiation. The cell membrane is of particular interest to this unit as you will be required to explain the structure and function of this particular organelle when you perform your practicals: An introduction to the membrane structure is given in this online tutorial:

[|Membrane tutorial]

Cellular transport is explained here: [|Cellular transport]

While passive and active transport are viewed in more detail here: [|Passive and active transport]

[|Active transport] [|Passive transport]

The normal life cycle of the cell.. the cell cycle is shown below in this animation:

[|The cell cycle] An interactive animation on the cell cycle and mitosis follows:

[|Cell cycle and mitosis]

Stephen Taylor comes to the rescue once again with his excellent powerpoints on both meosis and mitosis.

MEIOSIS

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MITOSIS AND CANCER

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This leads us onto the topic of cell differentiation and stem cells.A good introduction may be viewed here:

[|Stem cells and differentiation]

A more detailed, chromosomal viewpoint is shown here:

[|Differentation]

Stem cell usage may be investigated here: [|Learn Genetics- Stem Cells]

Have a look at this award winning introduction to stem cell research and see what you think: media type="youtube" key="2-3J6JGN-_Y" height="480" width="853"

The ethical considerations are discussed below: media type="youtube" key="hUxBJApV2ZA" height="480" width="640" align="center"