What type of bond do guanine and cytosine form?

Guanine and cytosine form three hydrogen bonds between their respective nitrogenous bases when they pair in DNA and RNA. This strong bond contributes to the stability of the DNA double helix structure. The three hydrogen bonds help ensure a more robust connection compared to the pairings involving adenine and thymine, which only form two hydrogen bonds. The additional hydrogen bond in guanine and cytosine pairing plays a crucial role in the overall integrity of the genetic material, making it less susceptible to breaking apart under stress or during processes such as replication or transcription.