What would happen if the bases in DNA strands were connected by a bond other than a hydrogen bond?

Question

anonymous · Answer

DNA polymerase would not be able to form complimentary strands of DNA.
		Each nitrogenous base would be able to form a base pair with any of the other bases.
		It would be more difficult for DNA to unzip since it would require more energy to break the bonds.
		The DNA molecule would be unstable because the two strands would separate more easily.

anonymous · Answer

The third one.  Covalent bonds are much stronger than hydrogen bonds.

blues · Answer

Norma is correct - if it assumes that they are now covalently bonded.

Actually, it does not give you enough info to answer it. If instead of hydrogen bonds or covalent bonds they were joined by weak electrostatic interactions (a partial positive charge attracted to a partial negative charge), then the molecule would be unstable because the two strands would separate more easily...