Structure and Properties of Amino Acids
Serine and threonine are polar amino acids due to

reactive alcoholic group in the side chain
reactive aldehyde group in the side chain
reactive keto group in the side chain
reactive hydroxyl group in the side chain

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

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

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