This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
Melting temperature of DNA is directly proportional to 
Select and explain. 
A. GC Pairing, B. AT Pairing, C. Length of DNA, D. None of the above
A: GC Pairing
Answer: A: GC Pairing 
Explanation: GC pairs have 3 hydrogen bonds and therefore melt at higher temperature compared to AT pairs which have 2 hydrogen bonds.