Exam (elaborations)
Trp Operon Test With Solution
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Trp Operon TestWith Solution
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
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