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 catalysing reactions. Which of the f3tu kfqd0)1a tollowing statements jvin3;1x0n jex, ;jqz3j5 ily are trueejj5 nz; ixv3jy1nli3,q0 ; xj?
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 temporaprt txs0 ff;wi0;er82 rily with energy 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 reaction 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 trxp;0sr 02wrtife8 ; tfue.
The other choices (Choices A, B and C) do not include all three statements.
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