Structure and Properties of Amino Acids
The isoelectric point of an amino acid is defined as the pH

where the molecule carries no electric charge
where the amino group is uncharged
of maximum electrolytic mobility
where the carboxyl group is uncharged

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

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