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 experime pe9b.h-ienk2 5 3io7 e( iwapcnts disp p 7 )orqrt-5a38c e;hevb0mxgroving spontaneous generation were replicate v eb7 3qeo8-rg5;mtca0rx h)p d by placing 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 the presence of microorganisejwdl8kbvmh2h h8- qr;01yz1 rfg-a5 ms as Flask R is exposed to the air, so bacteria can enter and Flask S wasn't boiled, so microorganisms originally0b2r hz8vgh qyfj1 lmw81h-5d-;aek r in the flask were not killed before 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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