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【单选题】
下列试液中,在ChP重金属检查法中用作显色剂的是( )。A.
硫酸铁铵试液
B.
氰化钾试液
C.
重铬酸钾试液
D.
硫酸铜试液
E.
硫化钠试液
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【简答题】硅二极管导通时的正向管压降约 v, 锗二极管导通时的管压降约 v 。
【简答题】constitutive gene expression
【简答题】基因表达(gene expression)
【简答题】硅二极管导通时的正向管压降约为 V ,锗 二极管导通时的管压降约为 V。
【简答题】锗二极管导通时的正向管压降约为0.2V,硅二极管导通时的正向管压降约为 V
【单选题】Cloning vectors with the transcription and translation signals needed for the regulated expression of a cloned gene are called expression vectors. Which of the following statements about expression ve...
A.
The rate of expression of the cloned gene is controlled by replacing the gene’s normal promoter and regulatory sequences with more efficient and convenient versions supplied by the vector.
B.
Generally, a well-characterized promoter and its regulatory elements are positioned near several unique restriction sites for cloning, so that genes inserted at the restriction sites will be expressed from the regulated promoter elements.
C.
In some cases, cloned genes are so efficiently expressed that their protein product represents 10% or more of the cellular protein. At these concentrations, some foreign proteins can kill the host cell (usually E. coli ), so expression of the cloned gene must be limited to 24 hours before the planned harvesting of the cells.
D.
Some of these vectors incorporate other features, such as a bacterial ribosome-binding site, to enhance translation of the mRNA derived from the gene or a transcription termination sequence.
【简答题】regulation of gene expression
【简答题】锗二极管导通时的正向压降约为 V ,硅二极管导通时的正向压降为 V 。
【简答题】电化学分析法是应用 原理进行物质成分分析的方法。我国现行质量标准中常用的电化学分析方法有 测定 pH、 和 。
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