true/false: N-acetyl glutamate regulates the urea cycle by increasing the transcription of the enzymes involved.

Which might be a physiological phenotype associated with loss of function of GLUT1?     inability of glucose to enter the intestinal cells from the intestinal lumen and high glucose excreted     accumulation of glucose in the intestinal epithelial cytoplasm     loss of glucose transport into somatic tissues (such as neurons in the brain)     low glucose levels in the bloodstream

Lactose intolerance is caused by reduced production of the enzyme lactase.  A variety of digestive system problems, such as celiac disease and Crohn’s disease) can also lower the production of lactase.  If an individual produces low levels of the enzyme lactase, explain why they might be able to tolerate eating dairy products that contain lower levels of lactose (e.g., hard cheeses, feta cheese, and cottage cheese), but will not be able to tolerate foods with high levels of lactose (e.g., milk).