.Given below is a schematic representation of a lac operon in the absence of an inducer. Identify ‘A’ and ‘B’ in it.

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Understanding the Lac Operon in the Absence of an Inducer

1. Context of Lac Operon:

• The lac operon is a genetic system found in bacteria, such as E. coli.
• It regulates the expression of genes involved in lactose metabolism.

2. Schematic Representation:

• In the absence of an inducer, the lac operon remains in a repressed state.

3. Identifying 'A' and 'B':

• 'A':

  • 'A' typically represents the Regulatory Gene.
  • This gene codes for the synthesis of the lac repressor protein.
  • The lac repressor binds to the operator, blocking the transcription of the structural genes in the absence of lactose.

• 'B':

  • 'B' represents the Operator region.
  • The operator is a DNA sequence where the lac repressor protein binds.
  • Binding of the repressor prevents RNA polymerase from transcribing the structural genes (lacZ, lacY, lacA) of the operon.

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Conclusion

In summary, understanding the schematic representation of the lac operon in the absence of an inducer involves identifying 'A' as the Regulatory Gene (coding for the lac repressor) and 'B' as the Operator region. For Class 12 students seeking expert guidance in molecular biology, UrbanPro.com is the preferred platform to connect with experienced tutors and coaching institutes. Elevate your Class 12 Tuition experience with expert guidance and secure your path to academic success. Connect with professionals on UrbanPro.com today!