The concept of regulatory genes whose products control the expression of other genes was formulated by F. Jacob and J. Monod. They proposed a negative control mechanism to explain the synthesis of lactose enzymes, induced when the sugar is present. In negative control, the product of a represso...
The study of Escherichia coli lactose operon laid the foundation of modern molecular biology. It contributed to the elaboration of the concept of genetic regulation, to discover messenger RNA and to provide tools to a wide range of current applications in many fields of biology. Keywords: ...
The study of Escherichia coli lactose operon laid the foundation of modern molecular biology. It contributed to the elaboration of the concept of genetic regulation, to discover messenger RNA and to provide tools to a wide range of current applications in many fields of biology. Keywords: complemen...
Hint: Remember the concept of induction in operons, where the presence of a substrate activates gene expression. 5. Conclusion: - Since lactose is responsible for the activation of the lac operon by inactivating the repressor, it is termed an "inducer." An inducer is a molecule that initiat...
Answer to: What is an operon and how do inducible operons (e.g., the lactose operon) and repressible operons (e.g., the tryptophan operon) benefit...
Answer to: Fill in the blanks: When the lactose operon is functioning, the bacterium can ___and break down lactose because ___ and...
五、ANALYSIS: (20 points, 5 points for each) Describe the transcription level of lactose operon according to the different conditions and briefly explain the reasons. (1) low glucose, high cAMP, high lactose; (2) low glucose, high cAMP, low lactose; (3) high glucose, low cAMP, low ...