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【多选题】
店铺优惠券可以分为哪几种?A.
领取型优惠券
B.
定向发放型优惠券
C.
金币兑换优惠券
D.
活动优惠券
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反馈参考答案：
举一反三
【简答题】建立()，然后在空数据库中添加表，再根据表建立其他数据库对象。
【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
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