本题目来源于试卷: Continuity and Change D.1 DNA Replication，类别为 IB生物学
[单选题]
Unlike the majority of other DNA polymeravomqt6g,+)s b sesef 7z s(+yt7ezw s-0xr, Taq polymerase, which is used in PCR reactions can withstand high temperatures without denaturing. Which of the following is a likely source for Taq polymerasexr+fw0zz eest7y(-7 s?
A. Bacteria living in the Arctic
B. Bacteria from the hot springs in Yellowstone National Park
C. Microorganisms in Siberia's deep permafrost
D. Bacteria found in the undergrowth of rainforests
参考答案: B
本题详细解析:
Taq polymerase was isolated from bacteria found in the hot springs at Yellowstone National Park, USA. This enzyme is able to withstand high temperatures used for PCR assays.
All other choices (Choice A, C and D) describe bacteria living in colder locations compared to hot springs which strongly suggests that enzymes present in these bacteria would not be adapted to higher temperatures.
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