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【单选题】
Well, Tom. I have nothing secret to tell you. you want to me to say?A.
How is it that
B.
How it is that
C.
What is it that
D.
What it is that
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反馈参考答案：
举一反三
【单选题】《党章》规定,党员如果没有正当理由,连续( )不参加党的组织生活,或不交纳党费,或不做党所分配的工作,就被认为是自行脱党。
A.
3个月
B.
6个月
C.
12个月
D.
24个月
【单选题】Cellular respiration is to ( ) as ( ) is to chloroplasts.
A.
nucleus, cytoplasm
B.
mitochondria, photosynthesis
C.
ATP, light
D.
nucleus, protein synthesis
【单选题】In what form is the majority of carbon dioxide that is generated by cellular respiration, transported to the lungs?
A.
as dissolved carbon dioxide in the blood plasma.
B.
bound to haemoglobin in red blood cells.
C.
as carbonic acid inside red blood cells.
D.
as bicarbonate ions in the blood plasma.
【多选题】What are the roles of ubiquinone in cellular respiration?
A.
In the mitochondrial respiratory chain, the small, hydrophobic molecule ubiquinone picks up electrons from the NADH dehydrogenase complex and delivers them to the cytochrome c reductase complex.
B.
A ubiquinone molecule can accept or donate either one or two electrons, and it picks up one H + from water with each electron that it carries.
C.
Its redox potential of +30 mV places ubiquinone between the NADH dehydrogenase complex and the cytochrome c reductase complex in terms of its tendency to gain or lose electrons—which explains why ubiquinone receives electrons from the former and donates them to the latter.
D.
Ubiquinone also serves as the entry point for electrons donated by the FADH 2 that is generated both during the citric acid cycle and from fatty acid oxidation.
【单选题】The generation of ATP by electron transport in photosynthesis and cellular respiration depends on:
A.
a proton gradient across a membrane
B.
proton pumps driven by electron transport chains
C.
an ATP-synthesizing enzyme complex
D.
above all
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