the hydrogen bond can be formed between purines

Answer 1

Yes, the hydrogen bond can be formed between purines. Purines are nitrogenous bases that consist of a double-ring structure, and they are one of the two types of nitrogenous bases found in DNA and RNA. The hydrogen bond is a type of intermolecular bond that can form between certain atoms, including hydrogen and nitrogen or oxygen. In DNA and RNA, purines (adenine and guanine) form hydrogen bonds with their complementary pyrimidine bases (thymine in DNA and uracil in RNA). This hydrogen bonding between purines and pyrimidines allows the two strands of the DNA double helix to be held together, facilitating proper replication and transcription processes.