Question

The trp operon in ___ regulates genes that code for enzymes required for synthesis of the amino acid tryptophan. The trp operon is a ___ operon. When tryptophan is not available in the environment, the trp repressor protein is ___. Therefore, RNA polymerase can bind to the ___ to begin transcription.

1) E. coli, inducible, active, promoter
2) E. coli, repressible, inactive, operator
3) Bacteria, inducible, inactive, promoter
4) Bacteria, repressible, active, operator

Answer 1

The trp operon in E. coli is a repressible operon that is turned on when environmental tryptophan is low, allowing synthesis of tryptophan. The correct response is E. coli, repressible, inactive, promoter.

Step-by-step explanation:

The trp operon in E. coli regulates genes that code for enzymes required for the synthesis of the amino acid tryptophan. The trp operon is a repressible operon, which is typically associated with biosynthetic pathways. When tryptophan is not available in the environment, the trp repressor protein is inactive, which allows RNA polymerase to bind to the promoter to begin transcription of the operon, leading to the synthesis of tryptophan. Therefore, the correct answer to fill in the blanks from the options provided is: 2) E. coli, repressible, inactive, promoter.