Question

what type of bond is formed when a nucleotide is attached to the backbone of a growing dna chain? phosphodiester bond hydrogen bond ionic bond condensation bond

Explanation:

In DNA synthesis, nucleotides are joined to the growing DNA chain through phosphodiester bonds. These bonds form between the 3'-hydroxyl group of one nucleotide and the 5'-phosphate group of the next nucleotide, creating the sugar - phosphate backbone. Hydrogen bonds hold the two strands of DNA together, ionic bonds are not the main bond in this context, and there is no such thing as a "condensation bond" in this specific DNA - building process.

Answer:

Phosphodiester bond