Question

the rungs are held together by ___ bonds
covalent
ionic
molecular

Explanation:

In the context of molecular - level structures like DNA (where rungs are often referred to), the rungs are held together by hydrogen bonds. However, among the given options, covalent bonds are the type that can hold atoms together within molecules. Covalent bonds involve the sharing of electron pairs between atoms. Ionic bonds involve the transfer of electrons and are typically between ions. Molecular is a general term for a group of atoms held together by chemical bonds, not a specific type of bond like covalent or ionic.

Answer:

covalent