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【简答题】
制备标准砷斑应取标准砷溶液( )mL,铁盐检查适宜的浓度范围是相当于标准铁溶液( )mL,重金属检查适宜的浓度范围是相当于标准铅溶液( )mL,硫酸盐检查适宜的浓度范围是相当于标准硫酸钾溶液( )mL。
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【简答题】用于GPS水准计算的各种方法主要有哪些?
【简答题】KCL, KVL的相量形式分别是__【 】 和_ 【 】 _ 。
【多选题】How does reverse transcriptase produce DNA from viral RNA?
A.
Certain RNA viruses that infect animal cells carry within the viral particle an RNA-dependent DNA polymerase called reverse transcriptase. On infection, the single-stranded RNA viral genome (~10,000 nucleotides) and the enzyme enter the host cell.
B.
The reverse transcriptase first catalyzes the synthesis of a DNA strand complementary to the viral RNA, then degrades the RNA strand of the viral RNA-DNA hybrid and replaces it with DN
C.
The resulting duplex DNA often becomes incorporated into the genome of the eukaryotic host cell.
D.
These integrated (and dormant) viral genes can be activated and transcribed, and the gene products—viral proteins and the viral RNA genome itself—are packaged as new viruses. The RNA viruses that contain reverse transcriptases are known as retroviruses.