本题目来源于试卷: HL Topic A2.1 Origin of cells，类别为 IB生物学
[问答题]
7. Explain why the conditions on Ear * c,p;3(u;:jy/g pxq sfromhdonj q(6th today make the 6sianj0r+ *ke*nw k4/ andb: ispontaneous formation of organic carbon compounds lk0 dw4n: ienrjan *6+k isa*/bess likely compared to the conditions on Earth at the time of the origin of life.
参考答案: The present-day atmosphere has a lot more oxygen/ozone.
Oxygen can oxidise organic molecules, e.g. amino acids.
There is less UV light passing through the atmosphere today because there is more ozone.
UV light can provide energy for the formation of organic molecules on the Earth’s surface.
There is a much lower concentration of methane in the present-day atmosphere.
Methane molecules ($CH_4$) could be a raw material for formation of organic compounds. Note: Answers could state these points in reverse, refering to the properties of the
atmosphese at the time of the origin of life. Four of these points are needed for 4 marks.
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