In the following curves, the law of human digestive enzyme action can be correctly expressed () A. I and III B. II and III C. I and IV D. II and IV

In the following curves, the law of human digestive enzyme action can be correctly expressed () A. I and III B. II and III C. I and IV D. II and IV

(1) The optimum temperature of digestive enzyme in human body is about 37 ℃. Before the optimum temperature, with the increase of temperature, the activity of digestive enzyme gradually increases; after the optimum temperature is exceeded, the activity of digestive enzyme gradually decreases with the increase of temperature, corresponding to the wrong curve Ⅱ and curve Ⅰ. (2) with the enzyme content = a as the reference, when the enzyme content is lower than a, the reaction speed will decrease, so the beginning of curve Ⅲ is wrong When the enzyme content is higher than a, the reaction speed will be accelerated, corresponding to curve IV, curve III is wrong, curve IV is correct