Answer to Question #244586 in Biochemistry for Ray

Question

Draw the structure of lac operon and its action when the following conditions are prevailing in the media: increased glucose, low glucose, higher c-AMP, low c-AMP, higher glucose, and high c-AMP, low glucose and High c-AMP, Higher glucose and higher allolactose

Answer 1

 The structure of lac operon and its action 

when the media consist of increased glucose :

when there is an increased glucose concentration, then cAMP can't be formed and without cAMP, CAP can't bind to DNA. this results in a low level of transcription.

low glucose :

When glucose levels are low, cAMP was produced and bonded to CAP.where CAP allows binding of DNA. This cap also helps in the binding RNA polymerase to the promoter which leads to high levels of transcription.

Higher C-AMP :

Low C-AMP :

Higher glucose, and High c-AMP

Low glucose and High c-AMP:

Higher glucose and higher allolactose: