Intermolecular would be better described this way and intramolecular as within the molecule itself. Hence, an intermolecular breaking would be the breaking apart of nucleotides from DNA. Intramolecular breaking would be the breaking apart of the individual nucleotide into its component atoms.

In`tra*mo*lec"u*lar (?), a. Chem. & Physics

Between molecules; situated, or acting, between the molecules of bodies.

 

© Webster 1913.

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