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【单选题】
在网页上要链接到一个E-mail地址，正确的HTML代码是(62)。A.
＜A href＝'mailto：test@test.com'＞给我来信＜/A＞
B.
＜A href＝'tomail：test@test.com'＞给我来信＜/A＞
C.
＜A mailto＝'test@test.com'＞给我来信＜/A＞
D.
＜A tomail＝'test@test.com'＞给我来信＜/A＞
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举一反三
【单选题】Which of the following enzymes cannot catalyze the formation of a phosphodiester bond?
A.
endonuclease
B.
RNA polymerase
C.
DNA polymerase
D.
ligase
E.
none of the choices are correct.
【单选题】___________ restriction endonucleases, first isolated by Hamilton Smith in 1970, are simpler, require no ATP, and catalyze the hydrolytic cleavage of particular phosphodiester bonds in the DNA within ...
A.
Type I
B.
Type II
C.
Type III
D.
Type IV
【单选题】Which of the following would prevent the formation of a phosphodiester bond in DNA?
A.
removal of a nitrogen from one of the bases
B.
removal of oxygen from carbon 2 of the sugar
C.
removal of an oxygen from carbon 3 of the sugar or removal of the phosphate from the gamma position of the nucleoside triphosphate
D.
removal of the phosphate from the alpha position of the nucleoside triphosphate
E.
removal of the phosphate at the beta position of the nucleoside triphosphate
【单选题】Depurination does not break the DNA phosphodiester backbone but instead removes a purine base from a nucleotide, giving rise to lesions that resemble missing _____.
A.
nose
B.
eyes
C.
teeth
D.
ears
【单选题】DNA ligase catalyzes the formation of a phosphodiester bond between a 3′ hydroxyl at the end of one DNA strand and a 5′ phosphate at the end of another strand. The phosphate must be activated by adeny...
A.
AMP
B.
ADP
C.
NAD +
D.
NADP +
【单选题】Once the two fragments are joined, the final sealing phosphodiester bond is formed by
A.
Polymerase
B.
exonuclease
C.
Transcriptase
D.
Ligase
【单选题】关于法治思维,正确的表述是
A.
法治思维以法治价值和法治精神为依据
B.
法治思维以法律原则和法律规则为指导
C.
法治思维以法律手段与法律方法为依托
D.
法治思维是一种部分符合规律、尊重事实的科学思维
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