The B form DNA is the only natural conformation of DNA.()
The B form DNA is the only natural conformation of DNA.()
The A form and Z form DNA are not the natural conformation of DNA.
The A form and Z form DNA are not the natural conformation of DNA.
(+)DNA即是与mRNA序列互补的DNA.
(+)DNA即是与mRNA序列互补的DNA.
In order to package the 3x109 nucleotides of DNA into the nucleus, the DNA is wound around histones. These are proteins that bind to the DNA. The interaction of histones and DNA involves:
In order to package the 3x109 nucleotides of DNA into the nucleus, the DNA is wound around histones. These are proteins that bind to the DNA. The interaction of histones and DNA involves:
DNA存在于人类（）及（）中。形成（）物质，分别称为（）（核内DNA.和线粒体DNA（核外DNA.，二者的遗传规律不同。它们没有组织特异性，但有（）和（）。
DNA存在于人类（）及（）中。形成（）物质，分别称为（）（核内DNA.和线粒体DNA（核外DNA.，二者的遗传规律不同。它们没有组织特异性，但有（）和（）。
(+)DNA即是与mRNA序列互补的DNA. A: 正确 B: 错误
(+)DNA即是与mRNA序列互补的DNA. A: 正确 B: 错误
病毒基因组的可能组成是（） A: 仅由RNA组成. B: 仅由DNA组成. C: RNA 或DNA. D: RNA和DNA.
病毒基因组的可能组成是（） A: 仅由RNA组成. B: 仅由DNA组成. C: RNA 或DNA. D: RNA和DNA.
Tm是指--的温度A.双螺旋DNA.结构失去1/2时B.双螺旋DNA达到完全变性时C.双螺旋DNA.开始变性时D.双螺旋DNA结构失去1/4时
Tm是指--的温度A.双螺旋DNA.结构失去1/2时B.双螺旋DNA达到完全变性时C.双螺旋DNA.开始变性时D.双螺旋DNA结构失去1/4时
Topoisomerase II catalyzes the transient breaking and rejoining of two strands of duplex DNA which allows the strands to pass through one another, thus altering the topology of DNA.
Topoisomerase II catalyzes the transient breaking and rejoining of two strands of duplex DNA which allows the strands to pass through one another, thus altering the topology of DNA.
Which of the following are NOT true about DNA polymerase I in E. coli: A: It can repair the gap in the single-strand DNA. B: It can replace DNA polymerase III to add dNTP into DNA chain when DNA template is damaged. C: Using dNTP as substrate. D: It possesses activity of 5’→3’ endonuclease.
Which of the following are NOT true about DNA polymerase I in E. coli: A: It can repair the gap in the single-strand DNA. B: It can replace DNA polymerase III to add dNTP into DNA chain when DNA template is damaged. C: Using dNTP as substrate. D: It possesses activity of 5’→3’ endonuclease.