Question

In a strain of E. coli that is auxotrophic for tryptophan, it is found that one of the enzymes necessary for tryptophan biosynthesis has a much smaller molecular weight than the wildtype enzyme (based on gel electrophoresis); however the mRNA thast encodes the protein is very similar in length in both the wildtype and mutant strains. The mutation is therefore likely to be:
A. A silent mutation
B. A missense mutation
C. Either a silent or missense mutation
D. Either a missense or nonsense mutation
E. Either a nonsense or frameshift mutation

Answer 1

Is it a T/B question...?

Answer 2

Option A.

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