does the hydrogen bond can be formed between guanine and adenine

Answer 1

Yes, a hydrogen bond can be formed between guanine and adenine. These two nucleobases are complementary to each other and are found in the DNA molecule. The hydrogen bond occurs between the nitrogenous bases, more specifically between the hydrogen atom of the amino group in adenine and the oxygen atom in the carbonyl group of guanine. This bond helps to stabilize the DNA double helix structure.