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bobby Forum Guru Topics: 136 Posts: 569	Feb 15, 2004 - 1:24 PM       #1 An investigator has isolated a bacterium that, in the absence of glucose, constitutively produces the proteins coded for by the lac operon. Which of the following statements explains this observation? A)the promoter has a mutation that prevents RNA polymerase from binding B)there is missense mutation in the gene for beta-galactosidase C)the gene for the catabolite activator protein is mutated and inactive D)there is a mutation in the attenuator sequence E)the gene for the repressor protein is mutated and inactive please explain your answer, thanx
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krsma Forum Elite Topics: 40 Posts: 227	Feb 15, 2004 - 6:04 PM       #2 E if no repressor protein --> nothing stopping Lac Operon from expression
bioguy Forum Guru Topics: 75 Posts: 1038	Apr 12, 2008 - 4:07 PM       #3 https://www.prep4usmle.com/forum/thread/70314/ somewhat related question, please answer
sigh Forum Junior Topics: 73 Posts: 1743	Apr 13, 2008 - 5:58 PM       #4 E If proteins are constantly produced in absence of glucose then we can think about 3 possibilities: 1-repressor is absent 2-repressor can't bind to operator 3-operator is defective
mohammem Forum Newbie Topics: 2 Posts: 198	Dec 13, 2010 - 12:38 AM       #5 repressor gene part of spesific respone element if inactivaed by mutation,,,so gene encode the protein will be under effect of promoter only(which responsible for normal rate of protein transcription in absense of glucose,,,,,,,,,,,,,,,E,,,,,,,,,,,,,,,,,

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