Question

select the correct answer from each drop-down menu.

the ilv-leu operon contains seven genes necessary for the biosynthesis of isoleucine, valine, and leucine. the structural genes of this operon are transcribed when these amino acids are deficient in the cell.

the vana operon modifies the binding targets of antibiotic vancomycin and therefore give antibiotic resistance to bacteria. the structural genes of this operon are transcribed when the antibiotic vancomycin is present in the environment.

the ilv-leu operon is choose an answer operon, and the vana operon is choose an answer operon.

options for drop-down:

• an inducible
• a repressible
• a transcriptional

Explanation:

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<reasoning>

Analyze the ilv-leu operon

Using the Repressible Operon knowledge point

• The ilv-leu operon encodes genes for synthesizing isoleucine, valine, and leucine.
• These structural genes are transcribed when these amino acids are deficient.
• When these amino acids are abundant, they act as co-repressors to turn off transcription.
• Therefore, this biosynthetic pathway is controlled by a repressible operon.

Analyze the VanA operon

Using the Inducible Operon knowledge point

• The VanA operon encodes proteins that alter binding targets to provide resistance to Vancomycin.
• These genes are transcribed only when the antibiotic Vancomycin is present in the environment.
• The presence of the substrate/inducer (Vancomycin) turns on transcription.
• Therefore, this resistance pathway is controlled by an inducible operon.

</reasoning>

<answer>
The ilv-leu operon is <blank>a repressible</blank> operon, and the VanA operon is <blank>an inducible</blank> operon.
</answer>

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Answer:

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<reasoning>

Analyze the ilv-leu operon

Using the Repressible Operon knowledge point

• The ilv-leu operon encodes genes for synthesizing isoleucine, valine, and leucine.
• These structural genes are transcribed when these amino acids are deficient.
• When these amino acids are abundant, they act as co-repressors to turn off transcription.
• Therefore, this biosynthetic pathway is controlled by a repressible operon.

Analyze the VanA operon

Using the Inducible Operon knowledge point

• The VanA operon encodes proteins that alter binding targets to provide resistance to Vancomycin.
• These genes are transcribed only when the antibiotic Vancomycin is present in the environment.
• The presence of the substrate/inducer (Vancomycin) turns on transcription.
• Therefore, this resistance pathway is controlled by an inducible operon.

</reasoning>

<answer>
The ilv-leu operon is <blank>a repressible</blank> operon, and the VanA operon is <blank>an inducible</blank> operon.
</answer>

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"Gene Regulation"
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