Listen Which backbone arrangement BEST represents that of two peptide bonds? Ca$-$N$-$C$-$C$-$N$-$Ca Ca$-$N$-$Ca$-$C$-$a$$N$$Ca$$C Ca$-$C$-$NC$\backslash$alpha $-$C$-$N C$-$N$-$Ca$-$CaC$$N