Which of the following is true about the structure of nitrogenous bases?
Select the correct answer below
The primary structure of a purine is two carbon nitrogen rings: a five-membered ring that shares a side with a six-
membered ring
O Pyrimidines have a single six-member, carbon-nitrogen ring as their primary structure.
Each of these basic carbon-nitrogen rings has different functional groups attached to it.
O all of the above