in section 6.4, there is a table that indicates that intestinal cells express the enzyme lactase, whereas nerve and white blood cells do not express lactase. lactase is an enzyme that digests lactose, a sugar found in milk. why would intestinal cells express lactase but nerve and white blood cells do not?
NtrC acts as an apoactivator which is phosphorylated by a specific protein kinase, called NtrB, to become an activator. The enhancer-bound phosphorylated NtrC physically contacts the promoter-bound σ54-RNA polymerase by looping out the intervening DNA sequence.
in section 6.4, there is a table that indicates that intestinal cells express the enzyme lactase, whereas nerve and white blood cells do not express lactase. lactase is an enzyme that digests lactose, a sugar found in milk. why would intestinal cells express lactase but nerve and white blood cells do not?
Lactose intolerance or lactase deficiency is a condition characterized by the inability of adults to digest lactose, a sugar found in milk and to a lesser extent in dairy products, causing side effects due to lactase deficiency, such as bloating, diarrhea or abdominal pain. Congenital lactase deficiency, i.e. since birth, makes children unable to tolerate drinking milk, even breast milk; They suffer bloating, stomach cramps, or diarrhea.
why would intestinal cells express lactase but nerve and white blood cells do not?
It is scientifically known that cells scattered on the intestinal membrane help the body fight some diseases, but the study showed that some cells are much more effective than thought, as they can recognize bacteria that were previously exposed and fight them in a better way.
What allows for intervening sequence between a promoter and a regulatory to be looped out so that a regulatory protein can contact RNA polymerase?
NtrC acts as an apoactivator which is phosphorylated by a specific protein kinase, called NtrB, to become an activator. The enhancer-bound phosphorylated NtrC physically contacts the promoter-bound σ54-RNA polymerase by looping out the intervening DNA sequence.