1. ns the ene d onditions occur? For each condition below, mark an X in the colu

Question

1. ns the ene d onditions occur? For each condition below, mark an X in the column labelled Activated or Repressed, then explain why you chose that answer. Please assume the glucose levels are low in the cell. The first row is done for you. Activated ressed lain vour answe Repressor, Lactose, and RNA polymerase are all present in abundance Repressor binds to lactose so it can no longer bind to the operator RNA polymerase then actively transcribes the beta-galactosidase and lactose permease genes, and otein svnthesis occurs Repressor and RNA polymerase are both present irn abundance, and there is no Lactose present Lactose and RNA polymerase are both present in abundance and there is no Repressor resent Lactose and Repressor are both present in abundance, and there is no RNA polymerase present RNA polymerase is present in abundance, and there is no Repressor protein or Lactose resent Activated means that the genes are actively transcribed and proteins are synthesized Repressed means that the genes are not transcribed and no protein synthesis occurs

Explanation / Answer

Activated Repressed Explain your answer Repressor and RNA polymerase are both present in abundance and there is no lactose present x The operon is repressed because the repressor protein is continuously synthesized. This protein bind with the operator region of the lac operon and prevents the RNA polymerase to bind at the promoter site to start the transcription process.However, the presence of lactose can make conformational changes in the repressor protein by binding at an allosteric site and prevent it from binding to the operator.But in this condition, no lactose is present so the operon will be repressed. Lactose and RNA polymerase are both present in abundance and there is no repressor present x The operon will be activated because there is no repressor protein to stop the binding of RNA polymerase to the operator region of the operon. Lactose and repressor are both present in abundance and there is no RNA polymerase present x The operon will be repressed because RNA polymerase is very important to start the transcription process. RNA polymerase is present in abundance, and there is no repressor protein or lactose present x The operon will be activated because there will be no repressor protein to cause the inhibition of the operon and therefore there will be no need of lactose to activate the operon.

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