Which among the following nitrogenous bases i.e. purines are found in both DNA and RNA ?

Adenine and Guanine.

The correct answer is Option (1)-Adenine and Guanine.

Adenine and guanine are the purine nitrogenous bases found in both DNA and RNA. Purines are one of the two main types of nitrogenous bases, the other being pyrimidines.

In DNA, adenine (A) pairs with thymine (T), and guanine (G) pairs with cytosine (C). The base pairing is specific, forming a complementary structure. However, in RNA, thymine is replaced by uracil (U). Therefore, in RNA, adenine pairs with uracil, and guanine pairs with cytosine.

So, the common purine bases, adenine and guanine, are present in both DNA and RNA, participating in the base-pairing interactions that are crucial for genetic information storage and transfer.