What is the basic function of catabolic operons like the lac operon? to find an alternative energy source when glucose is absent or not present in sufficient amounts to find an alternative source of carbon when glucose is absent or not present in sufficient amounts to find an alternative source of carbon regardless of the amount of glucose present

Liberated hydroxyl group at the carbonyl group with acetal formation in the first half and carbon, reacts with the hydroxyl groups of the two compounds and other compounds (-COC-) from each other when connecting with ethereal water connection. This compound is given to glycosides name. If this event is going on between the two is called a sugar molecule of glucose or glucose disaccharide occurring compounds. If one is trisaccharides obtained if these events happening between the three sugar shall be in the same way. This event (n) if in one sugar molecule polysaccharides (starch, cellulose and glycogen) occurs. For example:Glucose + fructose> sucrose (cane or beet sugar), glucose + galactose> n of milk sugar glucose> starch, cellulose, etc.