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Tuesday, 25 September 2012

F211 Module 1 Membranes

Weekly Learning Outcomes

Students should be able to:
Outline the roles of membranes within cells and at the surface of cells.
State that plasma (cell surface) membranes are partially permeable barriers.
Describe, with the aid of diagrams, the fluid mosaic model of…

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Glycoproteins are proteins with chains of sugar molecules attached.
Carbohydrates are attached to lipids and proteins only on the external surfaces of cell membranes.


These molecules have polar and non-polar regions. Polar regions bind to
polar heads of phospholipids; non-polar regions bind to phospholipid tails.
It maintains the stability…

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Viruses enter cells by binding with receptors on the cell's plasma membrane that would normally bind to
the host's signalling molecules. An example of this is HIV.

Common Misconceptions

Understanding hydrophilic and hydrophobic behaviour and distinguishing between them
Students often have trouble conceptualising very small things at a nm…

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Receptor site ­ Protein or glycoprotein molecules on cell surfaces, used for attachment of specific
substances such as hormones or viruses.

Solute ­ A solid that dissolves in liquid.

Xylem ­ A plant tissue containing xylem vessels (and other cells) that are used to transport water in a plant


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