Biochemistry About DNA, true is: A Two strands are held together by peptide bonds B Non-covalent bonds in sugar-phosphate backbone C Most common DNA is Z- DNA D Melting point of DNA is closely related to cytosine guanine content of DNA 💡 Explanation About DNA, true is: ✓ Correct Answer: D. Melting point of DNA is closely related to cytosine guanine content of DNA