A Mutation Occurs in the Trp Operon DNA of E

question 13

Multiple Choice

A mutation occurs in the trp operon DNA of E. coli and results in the change to the two UGG tryptophan codons in the 5' UTR of the RNA to UAG stop codons. What effect will this mutation be expected to have on the regulation of this mutant trp operon compared to a wild-type operon?

• A) In the presence of tryptophan, transcription of the structural genes will be reduced compared with a wild-type operon.
• B) In the absence of tryptophan, transcription of the structural genes will be reduced compared with a wild-type operon.
• C) In the presence of tryptophan, the repressor will bind to the operator/promoter region with the mutant operon more strongly than with a wild-type operon.
• D) In the absence of tryptophan, RNA polymerase will not bind to the operator/promoter region with the mutant operon.
• E) In the presence of tryptophan, transcription of the structural genes will be enhanced compared with a wild-type operon.

---

Definitions:

Lowest Terms

The simplest form of a fraction, where the numerator and the denominator are reduced to their smallest values.

Lowest Terms

This term is used in mathematics, particularly fractions, to describe a fraction that has been simplified to its smallest possible numerator and denominator.

Relative Consumption

A measure comparing an individual's or group's consumption levels to another's or to a benchmark, often used to analyze economic well-being or social status.

New Year's Eve

The last day of the year, December 31st, celebrating the conclusion of the current year and the beginning of the new one.