Monogamy

Each individual mates exclusively with one partner over at least a single breeding cycle and sometimes for longer.

Monogamy occurs in fish, amphibians, reptiles, and mammals, but it is only commonly observed in birds, some rodents, and a few primate species.

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Certain side-chain conformations are energetically favourable, these side chain confirmations are called as Rotamers.

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Isoleucine and Threonine have two chiral carbons so exists in multiple RS configuration.

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The order of priority of some common functional groups in amino acids is

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RS Configuration 

Atoms of higher atomic number rank above those of lower atomic number (e.g., —OH ranks above —CH3). If the first substituent atoms are identical, the priority is established by the next atom outward from the chiral center (e.g., —CH2OH takes precedence over —CH3).