Question

chargaffs rules for the pairing of nitrogen bases is
multiple choice
a+t = g+c.
a = c and g = t.
a = g and c = t.
a = t and g = c.

Explanation:

Chargaff's rules state that in DNA, the amount of adenine (A) is equal to the amount of thymine (T), and the amount of guanine (G) is equal to the amount of cytosine (C). This is due to the base - pairing rules in DNA where A pairs with T and G pairs with C.

Answer:

D. A = T and G = C.