The promoter of the araBAD operon from E. coli is activated in the presence of arabinose and the absence of glucose and directs expression of genes encoding enzymes required for arabinose metabolism. 

Unlike the cases of lac and gal genes, where a repressor and an activator work together, here two activators work together: AraC and CAP. 

TLS Online TPP Program

#Id: 7869

#Unit 1. Molecules and their Interaction Relevant to Biology

TLS Online TPP Program

#Id: 7870

#Unit 1. Molecules and their Interaction Relevant to Biology

TLS Online TPP Program

#Id: 7871

#Unit 1. Molecules and their Interaction Relevant to Biology

TLS Online TPP Program

#Id: 7872

#Unit 1. Molecules and their Interaction Relevant to Biology

Modern measurements require just a drop of blood, added to a test strip containing the enzyme glucose oxidase

TLS Online TPP Program

#Id: 7873

#Unit 1. Molecules and their Interaction Relevant to Biology

A nonenzymatic reaction occurs between glucose and primary amino  groups in hemoglobin (either the amino-terminal Val or the ´-amino -amino groups of Lys residues) forms GHB

TLS Online TPP Program

#Id: 7874

#Unit 1. Molecules and their Interaction Relevant to Biology

Normal GHB values are about 5% of total hemoglobin. In people with untreated diabetes, value may be as high as 13%