- 1、本文档共22页,可阅读全部内容。
- 2、有哪些信誉好的足球投注网站(book118)网站文档一经付费(服务费),不意味着购买了该文档的版权,仅供个人/单位学习、研究之用,不得用于商业用途,未经授权,严禁复制、发行、汇编、翻译或者网络传播等,侵权必究。
- 3、本站所有内容均由合作方或网友上传,本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺!文档内容仅供研究参考,付费前请自行鉴别。如您付费,意味着您自己接受本站规则且自行承担风险,本站不退款、不进行额外附加服务;查看《如何避免下载的几个坑》。如果您已付费下载过本站文档,您可以点击 这里二次下载。
- 4、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等,请点击“版权申诉”(推荐),也可以打举报电话:400-050-0827(电话支持时间:9:00-18:30)。
- 5、该文档为VIP文档,如果想要下载,成为VIP会员后,下载免费。
- 6、成为VIP后,下载本文档将扣除1次下载权益。下载后,不支持退款、换文档。如有疑问请联系我们。
- 7、成为VIP后,您将拥有八大权益,权益包括:VIP文档下载权益、阅读免打扰、文档格式转换、高级专利检索、专属身份标志、高级客服、多端互通、版权登记。
- 8、VIP文档为合作方或网友上传,每下载1次, 网站将根据用户上传文档的质量评分、类型等,对文档贡献者给予高额补贴、流量扶持。如果你也想贡献VIP文档。上传文档
查看更多
GeneRegulationSection
Gene Regulation Section 12–5 This section explains how some genes in prokaryotes and eukaryotes arecontrolled. Gene Structure Gene Regulation: Where does RNA polymerase bind? It binds to the promoter. Gene Regulation: Is the following sentence true or false? The actions of DNA-binding proteins help to determine whether a gene is turned on or turned off. Gene Regulation: What is an operon? It is a group of genes that is operated together. Gene Regulation: What is the function of the genes in the lac operon? They must be expressed for E. coli to use lactose as a food. Gene Regulation: Circle the letter of each sentence that is true about lactose. To use lactose for food, E. coli must take lactose across its cell membrane. The bond between glucose and galactose must be broken in order for E. coli to uselactose for food. Gene Regulation: Circle the letter of the number of genes in the lac operon found in E. coli. 1 2 3 4 Gene Regulation: What turns the lac operon off and on? The lac genes are turned off by repressors and turned on by the presence of lactose. Gene Regulation: How does the repressor protein prevent transcription? It prevents RNA polymerase from binding to the operator. Gene Regulation: How does lactose cause the lac operon to turn on? Lactose molecules bind to the repressor protein, causing it to change shape so that the repressor releases the operator. This allows RNA polymerase to bind to the promoter and transcribe the genes of the operon. Gene Regulation: Circle the letter of each sentence that is true about gene regulation in prokaryotic genes. b. Many other genes are regulated by repressor proteins.c. Some genes are regulated by proteins that enhance the rate of transcription. Eukaryotic Gene Regulation Is the following sentence true or false? Operons are frequently found in eukaryotes. False Eukaryotic Gene Regulation: How are eukaryotic genes usually controlled? Most are controlled individual
文档评论(0)