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Bio unit 1

charlotteamannt's version from 2018-06-12 10:24

Section 1

Question Answer
TriglycerideType of lipid made up of 1 glycerol and 3 fatty acid molecules.
Phospholipidlipid where 1 of the fatty acids has been replaced by a phosphate group
phospholipid bilayer2 layers of phospholipids arranged according to their properties. Phosphate heads = hydrophilic bc of their charge, while fatty acids= non-polar, are hydrophobic
amphipathic moleculemolecule that has both a hydrophilic and a hydrophobic part
Glycolipidsphospholipid and a carbohydrate attached together. Important in maintaining structure of cell membrane and in cells differentiating between self and non-self cells.
Cholesterolsteroid only found in animal cell membranes. vital in helping to maintain structure of cell membrane

Section 2

Question Answer
Membrane proteinsthey all carry out different functions, they all support plasma membrane in carrying out its distinctive function. All membrane proteins can be categorised either as integral or peripheral proteins depending on their position in the membrane
Integral proteins amphipathic and embedded in the plasma membrane. In most cases, they pass completely through the membrane
Peripheral proteins polar and are attached to outside of plasma membrane
Channelssome proteins have a pore/channel that allows passive transport of substances between inside and outside of cell.
Carriersthese proteins bind to substances on one side of membrane and then change shape to transport them to other side.
Protein pumpsCarrier proteins that use energy to change shape
Recognition help the cell in differentiating between self and non-self cells (important in triggering an immune response).
Receptorsthese proteins usually span the whole membrane to relay information from inside or outside of cell
Enzymesproteins that enhance the rate of reactions that happens at the membrane level.