大多数生物将遗传信息储存在DNA中,因为DNA是一种高保真的材料。真核生物还把DNA与组蛋白结合起来,形成染色质结构,保存在细胞核中。同时,还通过复杂的修复机制保证其忠实性。 当DNA中的某个遗传信息需要表达时,第一步是将其转移到RNA分子上,即转录(transcription)。所以多数RNA是DNA中部分信息的临时载体,成本低,寿命...
以DNA为模板,在RNA聚合酶作用下合成RNA的过程 promoter启动子(promoter): 与基因转录启动有关的特定保守序列;启动子本身不被转录 transcription factor反式作用因子 又称调节蛋白(DNA结合蛋白DBP,或转录因子TF) 基本转录因子:是RNA聚合酶结合启动子所必需的一组蛋白因子,决定三种RNA(mRNA、tRNA及rRNA)转录的类别。 特...
生物信息的传递-Transcription——从DNA到RNA精选全文完整版
【14】The initiation of transcription in bacteria begins with the binding of RNA polymerase tothe promoter in DNA. Transcription initiation is more complex in eukaryotes, where a group of proteins called transcription factors mediates the ...
转录(transcription)：基因转录是在细胞核内进行的。它是指以DNA的一条链为模板，按照碱基互补配对原则，合成RNA的过程。转录 DNA RNA 参与转录的物质 原料:NTP(ATP,UTP,GTP,CTP)模板:DNA酶:RNA聚合酶转录的场所：细胞核（真核生物）转录的条件：需要酶和ATP(解旋酶和RNA 聚合酶），以及其他蛋白质因子转录的结果...
转录因子(Transcription Factors):a type of protein that binds to a specific DNA sequence and regulates gene transcription--turn on and off--that gene are expressed at the right time and in the right amount 转录因子结合位点(Transcription Factor Binding Sites(TFBS)):4-20bp short DNA sequence whe...
(RNA::new("U").unwrap(), DNA::new("A").unwrap().to_rna()); }#[test]//#[ignore]fntest_transcribes_thymine_to_adenine() {assert_eq!(RNA::new("A").unwrap(), DNA::new("T").unwrap().to_rna()); }#[test]//#[ignore]fntest_transcribes_all_dna_to_rna() {assert_eq!(...
百度试题 题目Reverse transcription (逆转录):以RNA 为模板合成DNA,由逆转录酶催化。相关知识点: 试题来源: 解析 正确 反馈 收藏
图17-7 Diagrammatic representation of DNA transcription by E.coli RNA polymerase.The polymerase unwinds a stretch of DNA about 17base pairs in length forming a transcriptional bubble thatprogresses along thd DNA.The DNA has to unwind ahead of the polymerase and rewind behind it .The newly ...
Transcription is the first stage of the expression ofgenesinto proteins. In transcription, an mRNA (messenger RNA) intermediate is transcribed from one of the strands of the DNA molecule. TheRNAis called messenger RNA because it carries the "message," or genetic information, from the DNA to th...