Structure and Properties of Amino Acids
Proteins and macromolecular structures take on their higher order structures

by self-assembly
with the help of precursor sequences that are removed from the final structures
All of these
with the help of molecular chaperons

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Structure and Properties of Amino Acids
The sulphur containing side chain of cysteine is

hydrophillc, highly reactive and capable of reacting with another cysteine
hydrophobic, highly reactive and capable of reacting with another cysteine
None of these
ampiphillic, highly reactive and capable of reacting with another cysteine

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