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how are beta pleated sheets/strands formed?
when multiple strands are arranged side by side, sheets are formed
hydrogen bonds stabilise the structure
how are tertiary structures stabilised?
hydrogen bonds
electrostatic interactions
hydrophobic interactions
what are the two major classes of proteins?
fibrous
globular
what are fibrous proteins?
they have little/no tertiary structure with crosslinks
they are mostly insoluble as non-polar groups are exposed
what are globular proteins?
they are complex folded tertiary structures
non-polar groups are hidden so they are mostly water soluble
what is the quaternary structure of a protein?
when a protein has more than one subunit and sometimes other functional elements
what is the structure of haemoglobin?
4 chains
4 subunits
non-protein haem group binding an Fe2+
what is sickle cell anaemia a result of?
a mutation in haemoglobin