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

As an experienced tutor registered on UrbanPro.com, I am committed to providing quality Class 12 Tuition in biology. In response to your question about the lac operon, let's explore the schematic representation in the absence of an inducer, identifying the roles of 'A' and 'B.' 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. UrbanPro.com: Your Gateway to Exceptional Class 12 Tuition 1. Expert Tutors in Molecular Biology: Find expert tutors on UrbanPro.com specializing in molecular biology for Class 12 Tuition. Gain in-depth knowledge of genetic systems like the lac operon and its regulatory mechanisms. 2. Best Online Coaching for Class 12 Tuition: Explore a curated list of coaching institutes offering the best online coaching for Class 12 Biology. Access live sessions, study materials, and personalized guidance to excel in your Class 12 studies. 3. Verified Professionals for Quality Education: UrbanPro.com ensures that all tutors and coaching institutes are verified, providing a trustworthy platform for students. Read reviews and ratings to choose the most suitable tutor or coaching institute for your Class 12 Tuition needs. 4. Interactive Learning for Enhanced Understanding: Benefit from interactive online classes, discussions, and practical examples to enhance your understanding of complex topics. UrbanPro.com fosters an engaging learning environment to ensure academic success. 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! read less