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

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

Which of the following genes are structural genes? (). A: The promoter B: The enhancer C: The silencing D: The guide protein synthesis

下列属于顺式作用元件的是（ ） A: TATA Box B: Co-activator C: HDAC D: Enhancer

下列属于顺式作用元件的是（ ） A: TATA Box B: HMT C: Co-activator D: HDAC E: Enhancer

In prokaryotic cells, the DNA sequence which can be recognized and bound with RNA polymerase is called ( ) A: enhancer B: promoter C: silencer D: operator E: attenuator

In the initiation process of transcription, the sequence of DNA that allows RNA polymerase to bind is called A: the promoter region. B: the enhancer region. C: the termination region. D: the un-translated region (UTR)

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.

增强子（enhancer）是一种可以增强基因转录起始的顺式作用元件，其作用特点是没有方向性，无论位于靶基因上游、下游或者内部都可以增强基因的转录，试分析增强子增强基因转录的机理。

有关转基因育种，以下错误的说法是： A: 目前全球应用最广的转基因性状是RR和BT B: 转基因元件主要包括Promoter、Enhancer、Nos、Intron C: 基因枪法是目前使用最广的基因导入方法 D: 目前我国仅允许商业种植番木瓜和棉花转基因品种 E: 目前转基因技术只能实现少量物种个别基因的转移整合 F: 自然界本身就存在低频的跨物种基因转移整合