Interaction & Interdependence C.1 Enzymes & Metabolism (id: a233f1dd1)

本题目来源于试卷: Interaction & Interdependence C.1 Enzymes & Metabolism，类别为 IB生物学

[单选题]
Which are correct descriptions of1gc0 j)jir+qt the enzymer62lw ey4nrf;at) uk / catalysed metabolic pathways shown below? Letters represent various products oe; r tarn4k ulyf/62w)f individual reactions.

A. Pathway 1 is Chain: Intermediate A is constantly regenerated , Pathway 2 is Chain: End product is D
B. Pathway 1 is Chain: Chain: End product is D , Pathway 2 is Cyclical:Cyclical: Intermediate A is constantly regenerated
C. Pathway 1 is Chain: Intermediate A is constantly regenerated , Pathway 2 is Cyclical: End product is D
D. Pathway 1 is Cyclical: End product is D , Pathway 2 is Cyclical: Intermediate A is constantly regenerated


参考答案:  B


本题详细解析:
Both metabolic pathways1ai jco 3sjp4.j)o 7tz are catalysed by a series of different enzymes. Pathway 1 proceeds in a linear manner, and the end product 71jso4api)j t joz3c.is D. Pathway 2 is a cycle where the various products, such as A, are constantly regenerated. Pathway 1 is a chain reaction and Pathway 2 is a cyclical reaction, so Choices A and D are not correct. The end product for Pathway 1 is D, and the products keep cycling in Pathway 2, so Choice C is not correct.

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