本题目来源于试卷: Unity and Diversity A.3 Origin of Cells，类别为 IB生物学
[单选题]
Louis Pasteur's famous experiments disproving spontaneous generati yr*as5oyes 44on were rep ( j-e/y5:3m.oue9hdi w owp*c;v lh aglicated by plac :do 5;hml oeujwh/e.ic 9pa-y(g3*wving broth into various flasks.
Which two flasks would show the presence of microorganisms in the results?
A. $R$ and S
B. $S$ and Q
C. $Q$ and R
D. $P$ and Q
参考答案: A
本题详细解析:
Flasks R and S (Choice A) would show tazm2 3 wz x6xvq6n+z0p/;wgkw he presence of microorganisms as Flask R is exposed to the air, so bacteria can enter and Flask S wasn't boiled, so microorganisms originally in the flask were not killed beforem2qn/xg 6z xwzavp zk0w ;63+w the flask was sealed.
Flask P (Choice D) is incorrect as it was boiled first, killing any microorganisms and sealed so no more microorganisms can enter. Flask Q (Choices B, C, D) is incorrect because it was boiled, killing any microorganisms present. Swan-necked flasks prevent dust particles from carrying bacteria into the flask.
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