Question

which base-pair rules apply to the double helix structure?

SELECT ALL THAT APPLY

a. A-G
b. G-T
c. A-T
d. C-G

Answer 1

This is definitely more biology. Double helix represents DNA not RNA.
Adenine always pairs with thymine.
Cytosine will always pair with guanine.
So answers C and D.
The reason they pair together is because of the way they can form hydrogen bonds with one another.

Answer 2

A T and G C
C and D