Structure and Properties of Amino Acids
An essential amino acid is one that

the body cannot synthesize
is essential to flagella motion
the body can synthesize under essential conditions
is essentially easy to synthesize

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

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