Question

the two strands of nucleotides in a dna molecule are held together by _______.
fill in the blank.
○ hydrogen bonds between base pairs
○ sugar and phosphate bonding
○ strong ionic bonds
○ peptide bonds
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Explanation:

DNA's double helix structure relies on complementary base pairing (A-T, G-C) connected by hydrogen bonds, which stabilize the two strands. Sugar-phosphate bonding forms the backbone of each single strand, not the link between strands. Ionic bonds and peptide bonds are not involved in holding DNA strands together (peptide bonds link amino acids in proteins).

Answer:

hydrogen bonds between base pairs