本题目来源于试卷: Interaction & Interdependence C.1 Enzymes & Metabolism，类别为 IB生物学
[单选题]
An experiment tests the e xxlyh j756ke 77. pt66eig/yggq.wddfx44huxtui xak(u q10 x4aa75yfect of changing substrate concentration on an enzymatic reaction. What could be the independent and dependent va4y7x0kx a x5uxu4t(iah1 qa u4riables in this experiment?
A. Independent variable is temperaure, Dependent variable is substrate concentration
B. Independent variable is substrate concentration, Dependent variable is rate of product formation
C. Independent variable is enzyme concentration, Dependent variable is temperature
D. Independent variable israte of product formation, Dependent variable is substrate concentration
参考答案: B
本题详细解析:
In a scientific experiment, the independent variable 7vp(n 9n6ykno2 7uz.:m bqqsl is the variable that is changed or controlled, while the dependent variable is the variable that is measured as an outcome, or response, to the changes in the independent variable.
In an experiment that tests the effect of changing substrate concentration on an enzymatic reaction, the substrate concentration would be varied by the experimenter. Thus, substrate concentration is the independent variable.
During an enzymatic reaction, the enzyme catalyzes the formatiou7k:p.ovn7y 9qnb6lm(n 2 q szn of a product from the substrate. The rate at which product forms varies based on the activity of the enzyme, meaning this rate gives a measure of enzymatic activity. So, the rate of product formation could be the dependent variable in the experiment.
In this experiment, the effect of substrate concentration on rate of reaction is being tested, so enzyme concentration and temperature are controlled variables. (Choice A and Choice C). Choice D is the wrong way round.
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