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Summary Structure and Function of Membranes
Summary of the structure and function of phospholipid bilayers/ membranes.
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5.1 The Structure and Function ofMembranes
First review @October 2, 2023
Practise Q's Done
membranes separate contents of cells from their environment, they also separate
organelles from each other and the cytosol
some organelles are divided further my internal membranes, e.g. mitochondria
compartmentalisation is the name given to the process in which separate membrane-
bound areas within a cell are formed
this is important because metabolism (all the chemical reactions that occur within
a cell) reactions cannot happen in the same conditions
compartmentalisations allows different reactions to occur within different areas of a
cell
Membrane structure
the cell surface membrane that separates a membrane from its external environment is
called the plasma membrane
membranes are formed from a phospholipid bilayer
phospholipid bilayers are both hydrophobic and hydrophilic
the fatty acid ‘tails are hydrophobic and are sandwiched together to form a
hydrophobic core within the plasma membrane whereas the phosphate heads are
hydrophilic and face the outside of the plasma membrane
5.1 The Structure and Function of Membranes 1
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