a mutant strain of e.coli produces in the presence and absence of lactose where

Question

a mutant strain of e.coli produces in the presence and absence of lactose where in the operon might the mutation in th .com/biscms/mod/ibis/view.php?id 4835630 Jun 2018 11:59 PM 3/23/2018 10:32 PM n 7 of 12 netics: A Conceptual Approac Calculator Periodic Table Map stion has boUnivershy Amy Hulme at Missouri State University A mutant strain of E. coli produces ß-galactosidase in the pre in the operon might the mutation in this strain occur and why? (choose all correct answers) normally bind in the operator region, where the mutation leads to the failure of the operator to the repressor leads to increased levels of lac repressor being made near the laci gene, where the mutation leads to increased the operator in the operator region, which leads to increased binding of in the promoter the lac repressor to ] poltymerame to bing oo the hroneren. where the mutation leads to the failure of the RNA in the lacl gene, which leads to an inactive lac repressor the CAP binding site, w activity here the mutation leads to the inefficie leads to the inefficiency of RNA polymerase i Type here to search

Explanation / Answer

Take each option

First option where lac repressor unable to bind at the operator to stop the RNA polymerase. Hence in this situation transcription continued and synthesizes beta-galactosidase protein in the absence of inducer. This is correct.

Increase level of repressor will bind to operator. This is incorrect

Increased binding of repressor will stop the synthesis in absence of galactose.

If RNA polymerase fails to bind at the promoter region then it will not synthesize the beta-galactosidase in the presence of galactose.

Lac I gene mutation that form inactive repressor will not bind to operator hence it will make beta-galactosidase in both the condition.

If the RNA polymerase is not bind efficiently then it will not make beta-galactosidase in both conditions.

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