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【单选题】
有学者论述道,那种认为提高效率就要牺牲公平,或者说重视公平就要损失效率的观点,有一个前提,即在人们机会平等的情况之下,效率和公平之间才会呈现某种负相关的关系。这一观点有一定道理。的确,我国居民收入不平等的重要原因其实是在于机会平等方面还有待改进而非效率,而机会不平等的消除恰恰是同效率提高相辅相成的。所以,那种认为收入差别过大主要是由于过分强调了效率的观点,多少混淆了不同的问题。 作者对以上学者的观点持何种态度?( )
A.
赞成的
B.
反对的
C.
客观中立的
D.
无动于衷的
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举一反三
【单选题】CRISPR/Cas9 contains Cas9 and __________.
A.
sRNA
B.
mRNA
C.
siRNA
D.
sgRNA
【单选题】CRISPR/Cas9的表达期内,spacers和repeats序列一起被转录成长链的( )
A.
pre-CrRNA
B.
pro-CrRNA
C.
pre-rRNA
D.
CrRNA
【判断题】CRISPR/Cas9 system includes a CRISPR coding sequence and a Cas9 gene
A.
正确
B.
错误
【单选题】传统彩塑一般都是塑绘结合的综合体,即____分塑____分绘
A.
七、 三
B.
四、 六
C.
三、 七
D.
六、 四
【单选题】Which of the following is not true about CRISPR/Cas9 system ?
A.
The system contains a gRNA and an exo nuclease
B.
CRISPR refers to c lustered regularly interspaced short palindromic repeat
C.
A gRNA guides the endonuclease to load on a DNA target and cut it
D.
It is a part of immunity system of bacterium used to resist the foreign DNA
E.
The system contains a gRNA and an endonuclease
【单选题】传统彩塑一般都是塑绘结合的综合体,即____分塑____分绘
A.
三、七
B.
四、 六
C.
七、三
D.
六、 四
【多选题】Which of the following statements about gene editing by CRISPR/Cas9 are correct?
A.
On Jan 21, 2018, The Wall Street Journal reported that 86 people in China have had their genes edited using CRISPR/Cas9.
B.
In April 2015, Chinese scientists reported results of an attempt to alter the DNA of non-viable human embryos using CRISPR/Cas9 to correct a mutation that causes β-thalassemia. The study had previously been rejected by both Nature and Science in part because of ethical concerns. The experiments resulted in changing only some genes, and had off-target effects on other genes. The researchers stated that CRISPR/Cas9 is not ready for clinical application in reproductive medicine.
C.
In April 2016, Chinese scientists were reported to have made a second unsuccessful attempt to alter the DNA of non-viable human embryos using CRISPR/Cas9 - this time to alter the CCR5 gene to make the embryo HIV resistant.
D.
Heritable modifications could have unintended and far-reaching consequences for human evolution, genetically (e.g. gene/environment interactions) and culturally (e.g. Social Darwinism). Altering of gametocytes and embryos to generate inheritable changes in humans was defined to be irresponsible.
【单选题】肺实变最早出现的体征是:
A.
支气管语音
B.
语颤增强
C.
叩诊浊音
D.
湿啰音
【简答题】肺实变最早出现的体征是( )
【单选题】肺实变最早出现的体征是:
A.
支气管语音
B.
语颤增强
C.
叩诊浊音
D.
湿啰音
E.
呼吸音消失
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