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【多选题】
IIl型反应临床常见疾病有()A.
血清病
B.
输血反应
C.
链球菌感染后肾小球肾炎
D.
类风湿性关节炎
E.
系统性红斑狼疮
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【简答题】There are lots of ways to raise awareness for a cause. Usually, the 1 the idea is, the more it gets noticed. And that’s precisely why one 2 Frenchman has caught our attention. Baptiste Dubanchet is bi...
【简答题】1) Why were there many leaning towers in medieval Europe? 2) What did bell towers symbolize in medieval Italy? 3) When did the construction of the Pisa Tower begin? 4) Why did people stop ...
【单选题】某负反馈控制系统的开环传递函数为【图片】，若已知s=-1为该系统的一个闭环极点，则该系统还具有( )
A.
一对实部为s=-6 的闭环复极点
B.
一对实部为s=-6.5 的闭环复极点
C.
s=-5,s=-8 的两个闭环极点
D.
s=-4,s=-9 的两个闭环极点
【多选题】There are several important differences between genomic DNA clones and cDNA clones. What are the differences?
A.
Genomic clones represent a random sample of all of the DNA sequences found in an organism’s genome and, with very rare exceptions, will contain the same sequences regardless of the cell type from which the DNA came.
B.
Also, genomic clones from eukaryotes contain large amounts of noncoding DNA, repetitive DNA sequences, introns, regulatory DNA, and spacer DNA; sequences that code for proteins will make up only a few percent of the library.
C.
By contrast, cDNA clones contain predominantly protein-coding sequences, and only those sequences that have been transcribed into mRNA in the cells from which the cDNA was made.
D.
As different types of cells produce distinct sets of mRNA molecules, each yields a different cDNA library. Furthermore, patterns of gene expression change during development, so cells at different stages in their development will also yield different cDNA libraries. Thus, cDNAs can be used to assess which genes are expressed in specific cells, at particular times in development, or under a particular set of conditions.
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