A Missense Mutation in Neurospora Will Revert by Treatment with Nitrous

question 6

Multiple Choice

A missense mutation in Neurospora will revert by treatment with nitrous acid,but not by hydroxylamine.Hydroxylamine (HA) causes only G·C → A·T transitions,while nitrous acid causes both G·C → A·T and A·T → G·C transitions.The original mutation (not the reversion) must have been:

• A)AT to CG.
• B)AT to GC.
• C)AT to TA.
• D)GC to AT.
• E)GC to TA.

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