What is the metabolic abnormality that underlies the characteristic symptoms of diabetes mellitus?
◦ an inability of the body's cells to retain glucose they have absorbed from the blood
◦ an inability of the body's cells to absorb enough glucose from the blood
◦ an inability of the body's cells to switch from glucose metabolism to fat metabolism between meals
◦ a failure of the kidney tubules to reabsorb enough glucose from the urine