本题目来源于试卷: Interaction & Interdependence C.1 Enzymes & Metabolism，类别为 IB生物学
[单选题]
Enzymes play a role in cst*zi5 6fwbd )at1 xl64cnqflat 41 so-dalysing reactions. Which of the following statements are tt 6q-l1fc4ox1sad 4nlrue?
I.The substrate is temporarily provided with energy before being converted to a product.
II. Enzymes reduce the activation energy needed for the reaction.
III.The active site binds to the substrate making it easier for bonds to be broken or formed.
A. I only
B. I, II only
C. I, III only
D. I, II and III
参考答案: D
本题详细解析:
The substrate must be provided temporarily with evayn);ltk g38nergy in most metabolic reactions and this is called activation energy (in a test tube activation energy is often provided by heating the contents of the tube).
Enzymes reduce the activation energy for the reacv8lnkt3y)ag ; tion by stressing bonds in the substrate and by orienting the substrate to make it easier for bonds to be broken or made.
All three statements are true.
The other choices (Choices A, B and C) do not include all three statements.
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