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【单选题】
下列关于体温及其调节的叙述中，正确的是（）①人体维持体温所需的热量源于细胞呼吸过程所释放出来的能量②人体感受温度变化的温度感受器分布于皮肤和黏膜③当人处于寒冷的环境中，皮肤血管舒张、立肌收缩④下丘脑是调节体温的主要中枢⑤人体体温调节是通过神经调节完成的
A.
①②③
B.
①②④
C.
③④⑤
D.
②③④
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参考答案：
举一反三
【多选题】电泳的凝胶介质的高密度凝胶包括
A.
淀粉凝胶
B.
聚丙烯酰胺凝胶
C.
琼脂糖凝胶
D.
硅胶
查看完整题目与答案
【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.
查看完整题目与答案
【多选题】下列( )属于烦恼产生的原因
A.
执着
B.
好高骛远
C.
太自私
D.
嫉妒心
查看完整题目与答案
【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
查看完整题目与答案
【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
查看完整题目与答案
【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
查看完整题目与答案
【单选题】随着变换反应的进行，变换率增大，最适宜温度（）。
A.
降低
B.
升高
C.
不变
D.
没有关系
查看完整题目与答案
【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 +
查看完整题目与答案
【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
查看完整题目与答案
【判断题】中年期分析能力、思维能力和创造能力都处于最佳时期
A.
正确
B.
错误
查看完整题目与答案
相关题目：
【多选题】电泳的凝胶介质的高密度凝胶包括
A.
淀粉凝胶
B.
聚丙烯酰胺凝胶
C.
琼脂糖凝胶
D.
硅胶
查看完整题目与答案
【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.
查看完整题目与答案
【多选题】下列( )属于烦恼产生的原因
A.
执着
B.
好高骛远
C.
太自私
D.
嫉妒心
查看完整题目与答案
【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
查看完整题目与答案
【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
查看完整题目与答案
【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
查看完整题目与答案
【单选题】随着变换反应的进行，变换率增大，最适宜温度（）。
A.
降低
B.
升高
C.
不变
D.
没有关系
查看完整题目与答案
【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 +
查看完整题目与答案
【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
查看完整题目与答案
【判断题】中年期分析能力、思维能力和创造能力都处于最佳时期
A.
正确
B.
错误
查看完整题目与答案
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