©BRIGHTSTARS EXAM SOLUTIONS
11/16/2024 10:16 AM
Trp Operon Exam Questions With Correct
Answers
The tryptophan operon is a ______________ operon. - answer✔The tryptophan operon is a
repressible operon.
The tryptophan operon is involved in the synthesis of - answer✔tryptophan.
What happens to the this system when tryptophan is plentiful? - answer✔It shuts down.
Is tryptophan expensive? - answer✔Tryptophan is expensive to build and several steps are
necessary to build it.
What role does tryptophan play in this system? - answer✔Tryptophan is a corepressor; it is
required for the repressor (trpRP) to bind to the operator and stop transcription.
How many structural proteins are on the Trp Operon? - answer✔5. They are preceeded by the
regulatory region.
What is an attenuator region? - answer✔A control region following the promoter of repressible
amino acids that exerts transcriptional control of the polycistronic mRNA based on the
translation of the small leader peptide gene.
In the correct order, list the Trp Operon genes. - answer✔TrpE, TrpD, TrpC, TrpB, TrpA
Trp Synthesis is an example of __________ - answer✔polycistronic mRNA. It is translated into 5
distinct polypeptides.
How many binding sites are on the trp repressor protein? Name them. - answer✔2: one for Trp
and the other for the operator.
What happens when Trp is abundant? - answer✔Trp binds the repressor protein. The repressor
protein changes shape, exposing the operator binding site. The repressor protein binds the
operator. Transcription ceases.
What happens when tryptophan levels are very low? - answer✔Trp does not attach to the
repressor protein. There is no functional binding site for the operator on the repressor protein.
Transcription occurs. (because the repressor isn't repressing)
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11/16/2024 10:16 AM
Trp Operon Exam Questions With Correct
Answers
The tryptophan operon is a ______________ operon. - answer✔The tryptophan operon is a
repressible operon.
The tryptophan operon is involved in the synthesis of - answer✔tryptophan.
What happens to the this system when tryptophan is plentiful? - answer✔It shuts down.
Is tryptophan expensive? - answer✔Tryptophan is expensive to build and several steps are
necessary to build it.
What role does tryptophan play in this system? - answer✔Tryptophan is a corepressor; it is
required for the repressor (trpRP) to bind to the operator and stop transcription.
How many structural proteins are on the Trp Operon? - answer✔5. They are preceeded by the
regulatory region.
What is an attenuator region? - answer✔A control region following the promoter of repressible
amino acids that exerts transcriptional control of the polycistronic mRNA based on the
translation of the small leader peptide gene.
In the correct order, list the Trp Operon genes. - answer✔TrpE, TrpD, TrpC, TrpB, TrpA
Trp Synthesis is an example of __________ - answer✔polycistronic mRNA. It is translated into 5
distinct polypeptides.
How many binding sites are on the trp repressor protein? Name them. - answer✔2: one for Trp
and the other for the operator.
What happens when Trp is abundant? - answer✔Trp binds the repressor protein. The repressor
protein changes shape, exposing the operator binding site. The repressor protein binds the
operator. Transcription ceases.
What happens when tryptophan levels are very low? - answer✔Trp does not attach to the
repressor protein. There is no functional binding site for the operator on the repressor protein.
Transcription occurs. (because the repressor isn't repressing)
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