Which type of bond maintains the pairing of each purine to pyrimidine chain in the DNA molecule? a. disulfide bonds b. hydrogen bonds c. peptide bonds d. nucleic bonds

The correct answer is b. hydrogen bonds.<br /><br />In the DNA molecule, the pairing of each purine to a pyrimidine chain is maintained by hydrogen bonds. Specifically, adenine (a purine) forms two hydrogen bonds with thymine (a pyrimidine), while guanine (a purine) forms three hydrogen bonds with cytosine (a pyrimidine). These hydrogen bonds are crucial for the stability and structure of the DNA double helix.