本题目来源于试卷: Interaction & Interdependence C.3 Photosynthesis，类别为 IB生物学
[单选题]
What is the process that takes place before ex)hum(kw bl8:2ota a1icitxo)fj:s u,rm6 jss8tppz9c) 3cs)) ohed electrons are transferred from photosystem II to photosystem )s93 csrj6oc8x)o:s ) j)p zpshtum,fI?
A. Chemiosmosis
B. Photophosphorylation
C. Photoactivation of photosystem II
D. Reduction of NADP
参考答案: C
本题详细解析:
C Photoactivation of photosystem II needs to take place first before the transfer of excited electrons from photosystem II to photosystem I. Light energy needs to be absorbed by chlorophyll in photosystem II for the electrons to be excited to high-energy electrons. Chemiosmosis (Choice A), photophosphorylation (Choice B) and reduction of NADP (Choice D) are processes that take place after, or during, the transfer of excited electrons from photosystem II to photosystem I. The transfer of excited electrons from photosystem II to photosystem I causes a release of energy which is used to move protons into the thylakoid space. The movement of protons generates a proton gradient. Chemiosmosis then occurs, which leads to the synthesis of ATP, a process known as photophosphorylation. These excited electrons from photosystem I are then used to reduce NADP.
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