The polymerase chain reaction (PCR) requires template DNA,primers,DNA polymerase,and __________.
题目
The polymerase chain reaction (PCR) requires template DNA,primers,DNA polymerase,and __________.
A DNA ligase
B reverse transcriptase
C plasmid DNA
D a mixture of the four nucleotides A,T,C,G
E a mixture of the four fluorescent nucleotides that terminate elongation of the strand
One concern regarding the use of transgenic plants is the __________.
A inability to produce edible vaccines against infectious diseases
B loss of crop biodiversity,leading to potential widespread crop failures
C documentation of serious adverse health effects from transgenic products in the United States
D difficulty to regenerate entire plants with desired traits from plant cells with the desired DNA
E the ability of current transgenic varieties to pass the genetic trait on to the next generation
答案
举一反三
已知函数f(x)=x,g(x)=alnx,a∈R.若曲线y=f(x)与曲线y=g(x)相交,且在交点处有相同的切线,求a的值和该切线方程.
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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