Drawn Below Are Segments of β Sheets, Which Are Rigid

Drawn below are segments of β sheets, which are rigid pleated structures held together by hydrogen bonds between the peptide backbones of adjacent strands (Figure 4-79).The amino acid side chains attached to the α-carbons are omitted for clarity. (A)


(B)



Figure 4-79
A.For panel (A) and for panel (B), indicate whether the structure is parallel or antiparallel.
B.Draw the hydrogen bonds as dashed lines (||||||).