Final answer:
Base pairing between guanine and cytosine forms three hydrogen bonds, which is key to the stability and structure of DNA.
Step-by-step explanation:
Base pairing between guanine and cytosine results in three hydrogen bonds.
These bonds are crucial for the structure and stability of DNA. In the process of complementary base pairing, a purine always pairs with a pyrimidine, ensuring a consistent structure of the DNA molecule. Each nucleotide in DNA is composed of a deoxyribose sugar, a phosphate group, and a nitrogenous base. Guanine (G) is a purine and pairs with cytosine (C), a pyrimidine, forming three hydrogen bonds.
This pairing follows Chargaff's rules and is comparable in shape and structure to the pairing between adenine (A) and thymine (T), which only forms two hydrogen bonds.