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【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.
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【简答题】衡量谐振电路选频性能的指标有 、 、 。
【单选题】在使用糖皮质激素治疗哮喘时，应进行相应的用药护理，正确的观念或做法是
A.
每次吸入后用清水漱口
B.
长期使用不易引起肾上腺皮质萎缩
C.
易产生全身不良反应
D.
不易发生口腔真菌感染
E.
不会出现声音嘶哑
【简答题】什么是软件需求管理?
【简答题】测量包括测量对象,计量单位,测量方法及 等四个要素。
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