You are studying an operon from a new species of bacteria. A) What is an operon?
ID: 80927 • Letter: Y
Question
You are studying an operon from a new species of bacteria. A) What is an operon? B) The operon, abc, is turned on in the presence of the abc substrate, but is off when abc is absent. Is this operon inducible or repressible? C) You have isolated a mutant form of the bacteria that has a mutation in the abc operon. In these bacteria, the operon is off no matter what. What part of the operon was most likely mutated? D) Sketch a basic operon - include the operator, two structural genes, and the promoter. Be sure to label the parts.Explanation / Answer
Answer
B) The operon turned on in the presence of abc substrate and turned off in the absence of abs substrate then this operon is an example of inducible operon because the presence of substrate induces the expression of operon abc . the lac operon is the classical example of the inducible operon.
C) promoter part of bacteria is most likely mutated because if promotor of the operon is mutated it will not express the no matter if the substrate is present or not. The promoter is a region of where RNA polymerase bind nad initiate the transcription of the operonic gene. if it is mutated the RNA pol will not bind and transcription will not initiate irrespective of presence or absence of substrate.
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