question_answer 18)

  The net electric charge on DNA and histories is (a) both positive                 (b) both negative          (c) Both (a) and (b)             (d) zero

Answer:

                  (c) DNA consists of a nitrogenous base. Pentosesugar and a phosphate group. DNA has negative charge due to the presence of phosphate group (). Histories are rich in the basic amino acid residues lysines and arginines, which carry positive charges in their side chains. Therefore, his tones are positively charged.