The base sequence in one of the strands of DNA is TAGCATGAT.
(I') Give the base sequence of its complementary strand. (ii) How are these base pairs held together in a DNA molecule ? (iii) Explain the base complementarity rules. Name the scientist Who framed this rule.

Explanation

(i) The complementary strand is ATCGTACTA.
(ii) The base pairs are held together by hydrogen bonds in a DNA molecule. A and T are held by two hydrogen bonds while G and C are held by three hydrogen bonds.
(iii) Watson and Crickf ormed the base complementarity rule. Ther ule states that the ratios between adenine, thyrhine and guanine and cytosine are constant and equals one.