题干

下列叙述错误的是(    )

A:通过酶既可合成细胞代谢所需的多数物质,也可分解细胞代谢产生的某些有害物质

B:在探究温度对酶活性的影响的实验中,pH值、酶量、反应物消耗速率均为无关变量

C:在探究酶的专一性实验中,自变量可以是反应物的种类,也可以是酶的种类

D:在比较过氧化氢在不同条件下分解的实验中,证明了酶具有高效性

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答案(点此获取答案解析)

B

同类题3

Values join us together and set us apart. Today, our society has a terrible lack(缺乏)of values. Here are some social values that everyone needs.
◆Respect
Respect means to respect(尊重)others in everyday life. Even if you are against a person, it is important to have respect. It is this respect that makes us human. Without this respect, we become  animals. We need to respect our friends for our friendships. We even need to respect our enemies, because they help us to grow up and be stronger. Respect is one of the crucial values in a relationship.
◆Love
Love is everything. With love in our hearts, we feel no need to hurt another. With love in our hearts, we will pay more attention to the similarities in opinions rather than the disagreement. If we want others to be good to us, we need to be good to them. After all, we give love to get love, right?
◆Loyalty
People often forget the meaning and importance of loyalty(忠诚). Loyalty is necessary for people to believe in each other. In no matter what kind of relationship, we need to believe in each other so that we can work together towards the same goal.
◆Honesty
Honesty is to show other people who we really are. Honesty helps us do better, because it makes us realize our problems and find ways to solve them. It is this honesty, that will make others help you out, not because you need it. But, because they have problems too, which you can help out with. This honesty will help us follow the other values in society and, truly, "heal the world"!