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Questions and Answers
What is the main function of inducible operons?
What is the main function of inducible operons?
- Fine-tune transcrip=on to match the metabolic needs of the cell
- Increase glucose sensitivity in bacteria
- Activate transcrip=on of the operon based on the substrate (correct)
- Repress metabolic pathways
What is the primary role of operons in bacterial genomes?
What is the primary role of operons in bacterial genomes?
- Control protein translation
- Govern DNA replication
- Modulate cellular respiration
- Coordinate transcriptional regulation of genes in the same pathway (correct)
Which operon in E.coli is responsible for producing polypeptides needed for lactose utilization?
Which operon in E.coli is responsible for producing polypeptides needed for lactose utilization?
- Mal operon
- Trp operon
- Glc operon
- Lac operon (correct)
What describes the regulatory region shared by genes in an operon?
What describes the regulatory region shared by genes in an operon?
How do inducible operons differ from repressible operons?
How do inducible operons differ from repressible operons?
What is the preferred energy source for E.coli?
What is the preferred energy source for E.coli?
What is the most common structural feature of regulatory DNA-binding proteins in bacteria?
What is the most common structural feature of regulatory DNA-binding proteins in bacteria?
How do the polypeptides of a regulatory homodimer interact with DNA sequences?
How do the polypeptides of a regulatory homodimer interact with DNA sequences?
What is the significance of the 'turn' in the helix-turn-helix motif of regulatory DNA-binding proteins?
What is the significance of the 'turn' in the helix-turn-helix motif of regulatory DNA-binding proteins?
What was the outcome of the mutational analysis of the lac operon mutants?
What was the outcome of the mutational analysis of the lac operon mutants?
Which of the following best describes the cons%tu%ve mutants in the lac operon?
Which of the following best describes the cons%tu%ve mutants in the lac operon?
What is the role of complementation analysis in studying lac operon mutants?
What is the role of complementation analysis in studying lac operon mutants?
What compound is the real inducer of the lac operon?
What compound is the real inducer of the lac operon?
What is the function of the lac operon?
What is the function of the lac operon?
Which enzyme is encoded by the lacY gene within the lac operon?
Which enzyme is encoded by the lacY gene within the lac operon?
In the lac operon, what is the function of the lac repressor protein?
In the lac operon, what is the function of the lac repressor protein?
What happens when lactose is available but glucose is also present in the cell?
What happens when lactose is available but glucose is also present in the cell?
In a repressible operon, what causes transcription of the operon to be blocked?
In a repressible operon, what causes transcription of the operon to be blocked?
When tryptophan is absent in the cell, what happens in the trp operon?
When tryptophan is absent in the cell, what happens in the trp operon?
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