question_answer

In the DNA molecule                  

A) there are two strands which run antipanq lei one in \[5'\to 3'\] direction and other if \[3'\to 5'\] direction,                   

B) the total amount of purine nucleotides and pyrimidine nucleotides is not always equal.                           

C) there are two strands which run parallel in the \[5'\to 3'\] direction.

D) the proportion of adenine in relation to thymine varies with the organism.