conformers

epimers

anomers

enantiomers

$$\alpha$$-helical backbone

hydrophobic interactions

sequence of $$\alpha$$-amino acids

fixed configuration of the polypeptide backbone

isomers of glucose that differ in configurations at carbons one and four (C-1 and C-4)

a mixture of (D)-glucose and (L)-glucose

enantiomers of glucose

isomers of glucose that differ in configuration at carbon one (C-1)

cytosine and adenine

cytosine and guanine

cytosine and thymine

cytosine and uracil