l**e
发帖数: 70 | 1 2011CD step1 正确率76%，请过来人帮忙看看，考试的话是个什么水平，能上90吗？多
谢指点！ |
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l**e
发帖数: 70 | 2 1Q of 2011CD:
Vascular control is studies in an intact hind extremity of an anesthetized
experimental animal. After a normal control period, the blood flow to the
extremity is completelky occulded for 1min. When the occlusion is released,
blood flow increased abruptly and exceeds the control value for several
minutes (reactive hyperemia). After an appropriate recovery period, the
procedure is repeated and the extremity is actively exercised during the
occlusion period. Which of below best descri... 阅读全帖 |
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n***h
发帖数: 364 | 3 Anyone please explain why the answer is A not D? many thanks. |
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s********o
发帖数: 3319 | 4 restriction enzyme analysis means the 3 viral DNAs are treated with ONE
restriction enzyme and then the digestion products are loaded onto the gel.
a given restriction enzyme only cuts DNA at a specific sequence called
restriction site. usually a DNA fragment has a limited number of restriction
sites for a given enzyme.
in the above case, the linear HSV-1 viral DNA has 10 sites for the enzyme
they used, which produces 11 DNA fragment after the digestion.
D can be a result from a digestion in whi... 阅读全帖 |
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n***h
发帖数: 364 | 5 Thanks for your answer, but still confused. |
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a******3
发帖数: 1017 | 6 选A吧。
三个sample都是一样的病毒感染，那么他们的酶切位点和相应的pattern应该是一样的
。只有A或者D。
D的pattern是连续的，就是每个位点都切了，不是限制性的（restriction enzyme),只
有A的pattern是针对几个位点的，是限制性的，所以选A. |
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l*******d
发帖数: 449 | 7 a little risky for score 90 on step 1. CD is easier than NBME. 76% NBME is
85 |
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S******9
发帖数: 2837 | 8 看考试时间吧
如果还有2周左右，把FA好好背一下，90～93应该可以。 |
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h***a
发帖数: 312 | 9 我一个朋友考前一个月CD 才75％， 后来考了95。 |
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f***r
发帖数: 413 | 11
a simulation exam provided by USMLE.
You can download it online |
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l**e
发帖数: 70 | 12 c is correst. why? thanks for explain! |
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s********o
发帖数: 3319 | 13 the blood flow to skeletal muscle is determined by the local concentration
of metabolites.
more exercise ---> more metabolites ---> increased blood flow |
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l**e
发帖数: 70 | 14 THANKS.
Why in the 1st experiment, occlusion released but blood flow exceeds contrl
value? |
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s********o
发帖数: 3319 | 15 in 1st experiment, occlusion ---> metabolite accumulation, so when released,
---> increased blood flow ---> hyperemia
in 2nd experiment, occlusion + EXERCISE ---> MORE metabolite accumulation,
so when released, ---> MORE increased blood flow ---> INCREASED hyperemia |
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l**e
发帖数: 70 | 16 THANKS A LOT skyscorpio! u a so great! |
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