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← ScienceWhich outcome occurs when UV radiation damages molecular DNA?
A)Thymine dimers block DNA polymerase✓
B)Increased synthesis of purine nucleotides
C)RNA Polymerase disassembles into monomers
D)Ribosomes initiate error free translation
💡 Explanation
Thymine dimers form during UV damage because covalent bonds form between adjacent thymine bases on the DNA strand, via a process of photochemical excitation known, which stalls DNA polymerase. Therefore, replication is blocked, rather than increased synthesis or ribosome disruption.
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