Question

the rungs are held together by ___ bonds
covalent
ionic
molecular
hydrogen
rewatch

Explanation:

The question refers to the "rungs" of a structure, which in common biological contexts (e.g., DNA double helix) are base pairs held together by hydrogen bonds. Covalent bonds form the backbone, ionic bonds involve charged ions, and molecular bonds are not a distinct bond type here. Hydrogen bonds are the correct intermolecular force for the rungs.

Answer:

hydrogen (Note: Assuming the options are labeled, but since labels are missing, the correct text is "hydrogen". If forced to match typical multiple-choice format with implied identifiers: D. hydrogen)