原核生物的启动子由（） A: 核心启动子和上游控制元件（upstream control element）组成 B: -35，-10和转录起点组成 C: 由Fissite和UCE（upstream control element）组成 D: Fissite， UCE（upstream control element）以及 35，-10和转录起点等组成

It is important to note that from the core company’s perspective， the supply chain includes （）， upstream supplier and down stream customers.

‎The supply chain consists of two major parties. They are ________ partners and _________ partners. ​‎​‎​ A: upstream B: upper-level C: downstream D: lower-level

It is more likely that ___ bear(s) the corporate income tax. A: the corporation B: the entrepreneur C: employees and consumers D: upstream and downstream enterprises

Who will appear in the upstream?A. buyers B. producers C. both buyers and producers D neither A: A B: B C: C D: D

The signal transmission portion of the analog video surveillance system is responsible for the upstream transmission of the video signal and the downstream transmission of the control signal. ( ) A: 正确 B: 错误

.Which of the following applications would require a non bypassing<br/>type filter? () A: Return line filter B: Downstream of any fixed displacement pump C: Upstream of a servo valve D: In a separate filtering and cooling circuit

Some Internet services offer ____ connections, in which data travels upstream from your computer to the Internet at the same speed as data traveling downstream from the Internet to your computer. A: asymmetrical B: symmetrical C: always-on D: voiceband

从酵母中克隆到一段DNA序列具有类似原核生物DNA复制起始点的功能，即 A: USR(upstream replicating sequence) B: LTR(long terminal sequence) C: ARS(autonomously replicating sequence) D: ORF( open reading frame)

Both and heavy chain genes and κ light chain genes______. A: are found near each other on the same chromosome B: begin rearrangement by joining a V to a J region C: will have the extra J regions copied into the primary transcript D: with have the extra upstream VL regions copied into the primary transcript E: have two membrane-spanning exons at the 3’ end of each of the constant regions