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【多选题】
关于零件尺寸合格的条件,下列说法中正确的是()。A.
基本尺寸在最大极限尺寸和最小极限尺寸之间
B.
实际尺寸在最大极限尺寸和最小极限尺寸之间
C.
实际尺寸在公差范围内
D.
实际偏差的绝对值小于上、下偏差绝对值的最大值
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【简答题】gene expression
【简答题】硅二极管导通时的正向管压降约为 V ,锗 二极管导通时的正向管压降约为 V
【简答题】基因表达系列分析(serial ysis of gene expression，SAGE)
【简答题】基因表达(gene expression)
【多选题】How does the protein binding to the promoter affect gene expression?
A.
The binding of proteins to sequences both near to and distant from the promoter can also affect levels of gene expression.
B.
Protein binding can activate transcription by facilitating either RNA polymerase binding or steps farther along in the initiation process, or it can repress transcription by blocking the activity of the polymerase.
C.
In E. coli, one protein that activates transcription is the cAMP receptor protein (CRP), which increases the transcription of genes coding for enzymes that metabolize sugars other than glucose when cells are grown in the absence of glucose. Repressors are proteins that block the synthesis of RNA at specific genes.
D.
In the case of the Lac repressor, transcription of the genes for the enzymes of lactose metabolism is blocked when lactose is unavailable.
【单选题】How would you expect DNA methylation to alter gene expression?
A.
greatly increase expression
B.
moderately increase expression
C.
no change in expression
D.
measurably decrease expression
E.
either increase or decrease expression
【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
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