| December 7, 2015

In a Neurospora biosynthetic pathway there are three intermediates, which we can abbreviate A, B, and C, leading to the final product thymine (T). Supplementation tests showed that there were four groups of thymine-requiring auxotrophic mutants: some grew with T or A or B or C; some grew with T or B; some grew with T only; some grew with T or A or B. The pathway must be A. A ?> B ?> C ?> T. B. C ?> B ?> A ?> T. C. A ?> C ?> B ?> T. D. C ?> A ?> B ?> T.

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