18. Which of the following descriptions is false ? (A) The double helix of DNA in the B-form is stabilized by nonspecific base-stacking interaction between two adjacent bases in the same strand. (B) The phosphodiester bond that joins adjacent nucleotides in DNA associates ionically with metal ions, polyamines, and proteins. (C) The phosphodiester bond that joins adjacent nucleotides in DNA is susceptible to alkaline hydrolysis. (D) The pentoses in nucleic acids do not undergo interconversion of the straight-chain form and the ring form. (E) The size and base composition of a double-stranded DNA are factors that affect the 'melting temperature of DNA.