【单选题】_____________ rely on ___________, such as Ca2+, cyclic GMP, phosphatidylinositol, and cyclic AMP, to activate (or inactivate) a variety of pathways within the cell.
【简答题】Excessive sugar has a strong mal-effect on the functioning of active【46】o______such as the heart, kidneys and the brain. Shipwrecked sailors who ate and drank nothing but sugar for nine days surely we...