_____ occurs when the thread or backbone of a long-chain molecule is broken, resulting in numerous smaller molecules.

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Main-chain scission is the process of breaking the backbone or thread of a long-chain molecule, resulting in the formation of numerous smaller molecules. This can be caused by various factors, including radiation, heat, or chemicals. Cross-linking, on the other hand, is the process of linking two or more polymer chains together, while a point lesion refers to a specific site of damage or mutation in DNA. Radiolysis is the process of dissociation or decomposition of molecules by radiation.

_____ Occurs When the Thread or Backbone of a Long-Chain