The Trp Operon in E

question 40

Multiple Choice

The trp operon in E. coli contains a 5' UTR sequence that is translated into a small polypeptide of 14 amino acids, which includes two tryptophans. If the two trp codons in the 5' UTR of the RNA are changed to serine codons and the resulting cells are starved for tryptophan but not for any other amino acid, what will be the effect of the mutant codons on the operation of the trp operon?

• A) The trp repressor will be synthesized in greater amounts.
• B) Expression of the trp structural genes will be less than with a normal trp operon.
• C) Expression of the trp structural genes will be greater than with a normal trp operon.
• D) The leader polypeptide will not be synthesized.
• E) The expression of the operon will not be affected by these mutations.

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Definitions:

Fossil Fuels

Natural fuels formed from the remains of living organisms over millions of years, including coal, oil, and natural gas.

Soil Chemicals

Substances prevalent in the soil which include minerals, organic matter, and various nutrients essential for plant growth.

Range Of Tolerance

The various environmental conditions within which a particular species can survive, beyond which the organism may suffer stress or death.

Recycle Nutrients

The process of breaking down organic matter and converting it into nutrients that can be used again by plants, contributing to the sustainability of ecosystems.