Which of the following statements are correct ( ) A: In eukaryotes, a gene can encode different proteins, but a mature mRNA chain encodes only one protein. B: The function of the promoter is affected by both the DNA sequence and its conformation. C: TFs help RNA polymerase recognize the promoter. D: In DNA biosynthesis, semi-reserved replication and semi-discontinuous replication refer to the same concept.

Riboswitch involves: A: taRNA B: crRNA C: hairpin structure D: ta promoter E: cr promoter

启动子（promoter）是指

Both eukaryotic RNA polymerase and prokaryotic RNA polymerase can directly recognize and bind to promoter.(<br/>)

When only glucose is available to E. coli in the culture medium:  ( ) A: cAMP-CAP is bound to the promoter； B: cAMP-CAP is not bound to the promoter； C: The repressor is not bound to the operator； D: The lac operon is turn on 

Which of the following statements about a protein-coding gene is NOT true? A: An enhancer is not a DNA sequence. B: It may have many exons and introns. C: The promoter region is not transcribed. D: Transcription factors can bind to the promoter region.

Operator is bound by A: activator B: repressor C: promoter D: enhancer E: silencer

Operator is() A: where the<br/>repressor binds to regulate gene expression in an operon. B: controlled<br/>by promoter. C: is induced<br/>by lactose. D: is repressed<br/>by tryptophan.

leader、promoter、time-keeper、follower、presenter等角色都是无领导小组讨论中的角色。（ )

Which of the followings are composite parts? A: Protein generator B: Inverter C: RBS D: promoter E: enhancer