複選題20. Which of the following statements regarding "Carbohydrate Metabolism" are CORRECT? (A) Gluconeogenesis is activated by insulin and helps to reduce blood glucose after a carbohydrate-rich meal (B) The Warburg effect is the observation that most cancer cells predominantly produce energy by a high rate of glycolysis followed by lactic acid fermentation in the cytosol (C) Pyruvate is the major carbon-containing compound produced by glycolysis (D) A high ratio of insulin to glucagon occurs during fasting state can promote the synthesis of glycogen (E) Glucose enters muscle cells mostly by simple diffusion