Please give me the answer to the A-level Biology Question Describe how the lac operon works when lactose is both present and absent.

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Professor Daniel Keaton spent a decade as an A-level subject lead in Maths and Physics before transitioning into higher education as a lecturer in Pedagogy and Assessment, building twelve years of expertise in A-level teaching and exam methodology, academic mentoring for both high-achieving and struggling students, tutor training and first-session design, online tutoring practice and digital learning psychology, as well as guiding families through informed tutoring decisions and supporting tutors in career development, from earning potential to business setup and market positioning.