WebThe expression of the tryptophan operon is controlled by a repressor that is inactive when it binds to lactose. a repressor that is active when it binds to tryptophan. a repressor that is active when it is alone. an activator that turns the operon on by binding to DNA. C ) a repressor that is active when it binds to tryptophan . WebWhat does the lac operon produce when the repressor is inactive? A. Describe whether the Lac operon considered to be a repressible or inducible operon? How do you know? B. You first test the operon under conditions in which lactose is present in the body. Do you want to make lactase? Therefore, is the repressor active or inactive? Does it bind to
Lac Operon - Concept, Diagram, Notes, Gene Regulation - BYJUS
WebMay 27, 2024 · Allolactose is a lac operon inducer. if it accumulates in the cell, it will bind the lac repressor protein and reduce its affinity for the lac operon operator sequence. The allosterically altered repressor dissociates from the operator, and RNA polymerase can resume transcribing the lac-operon genes (Figure 12.5). WebEach operon contains regulatory DNA sequences, which act as binding sites for regulatory proteins that promote or inhibit transcription. Regulatory proteins often bind to small … raf c-130j hercules
Trp operon (video) Khan Academy
WebCâu 623705: Trong cơ chế hoạt động của Operon – Lac, vị trí nào sau đây là nơi tương tác với protein ức chế? A. Nhóm gen cấu trúc Z, Y, A B. Vùng khởi động P C. Gen điều hoà R D. Vùng vận hành O WebInactive lac repressor lacl lacZ Figure 18.5 Glucose is the preferred food source so the lac operon is activated only when glucose is scarce. Positive Gene Regulation: CAP Active CAP helps RNA polymerase bind to promoter “catabolite activator protein” When glucose is abundant, lac is not transcribed Figure 18.5 Inactive lac repressor ... WebIn E. coli, the lacZ gene is the structural gene for β-galactosidase; which is present as part of the inducible system lac operon which is activated in the presence of lactose when glucose level is low. β-Galactosidase synthesis … raf cadets glasgow