When cells synthesize DNA, a built-in proofreader recognizes and corrects mistakes, but the RNA synthesis mechanism doesn't have this fail-safe.
当细胞合成 DNA 时,内置的校对器会识别并纠正错误,但 RNA 合成机制没有这种故障保护机制。
单词 | RNA synthesis |
释义 |
RNA synthesis
原声例句
TED-Ed(视频版) When cells synthesize DNA, a built-in proofreader recognizes and corrects mistakes, but the RNA synthesis mechanism doesn't have this fail-safe. 当细胞合成 DNA 时,内置的校对器会识别并纠正错误,但 RNA 合成机制没有这种故障保护机制。
中文百科
转录 Transcription (genetics)(重定向自RNA synthesis)
![]() ![]() 转录(英语:Transcription)是遗传信息由DNA转换到RNA的过程。作为蛋白质生物合成的第一步,转录是mRNA以及非编码RNA(tRNA、rRNA等)的合成步骤。 转录中,一个基因会被读取、复制为mRNA;就是说一特定的DNA片段作为模板,以DNA依赖的核糖核酸聚合酶(RNA聚合酶或RNA合成酶)作为催化剂而合成前体mRNA的过程。 转录尚有未清楚的部分,例如是否需要DNA解旋酶,一般来说是需要的,但某些地区称RNA聚合酶可代替其行使识别DNA上的有关碱基以开始转录的功能。 mRNA转录时,DNA分子双链打开,在RNA聚合酶的作用下,游离的4种核糖核苷酸按照碱基互补配对原则结合到DNA单链上,并在RNA聚合酶的作用下形成单链mRNA分子。至此,转录完成。 转录通常是多起点多向复制。 转录时所转录的仅为DNA上有遗传效应的片段(DNA),不包括内含子。
英语百科
Transcription (genetics) 转录(重定向自RNA synthesis)
![]() ![]() ![]() ![]() Transcription is the first step of gene expression, in which a particular segment of DNA is copied into RNA (mRNA) by the enzyme RNA polymerase. Both RNA and DNA are nucleic acids, which use base pairs of nucleotides as a complementary language. The two can be converted back and forth from DNA to RNA by the action of the correct enzymes. During transcription, a DNA sequence is read by an RNA polymerase, which produces a complementary, antiparallel RNA strand called a primary transcript. |
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