Draw the chemical structures accurately showing hydrogen bonding between the indicated species. In some instances, the nature of the donor and acceptor species is specified. Draw structures in the ionization states expected at pH $7\mathrm{.}4.$

A$.$ Histidine side chain and aspartic acid side chain

B$.$ Serine side chain and carbonyl oxygen of peptide bond

C$.$ Tyrosine side chain and amide group of peptide bond

D$.$ Tryptophan side chain and bicarbonate ion

E$.$ Histidine to asparagine $($acceptor$)$ through an intervening water molecule; that is$,$ a His$-$water$-$Asn arrangement