B.The Code A.Double helix by element: mRNA:agu Serine base pairs,hydrogen bonding T y Codons and Anti-Codons D.Ends,Antiparallelism C.Strands and helical backboneA. Double helix by element: base pairs, hydrogen bonding B. The Code Codons and Anti-Codons C. Strands and helical backbone D. Ends, Antiparallelism