The genetic material in the bacterium $Escherichia$ $coli$ $(E. coli)$ is:

Which scientist's observations were the basis for the rule that the ratio between Adenine and Thymine,and Guanine and Cytosine in $DNA$ remains constant and equal to one another?

Which of the following statements is $NOT$ true for $DNA$?

The $DNA$ of $E. coli$ is:

Statement $P$: Uracil is not present in the structure of $DNA$.
Statement $Q$: $A-T$ complementary base pairing is present in the structure of $DNA$.

The acidity of the $DNA$ molecule is due to: