形容劳累的成语-榕怎么读

toxin that inhibits the three eukaryotic RNA polymerases to different extents. Name derives from mushroom of genus Amanita in which toxin is found.



β-galactosidase

Enzyme that cleaves lactose into galactose and glucose. Name origin: the bond cut by this enzyme is called a β-galactosidic bond.



β sheet A secondary structure in proteins, relatively flat and formed hydrogen bonding between two parallel or anti-parallel stretches of polypeptide.

σ subunit

Component of prokaryotic RNA polymerase holoenzyme. Reuired for recognition of promoters.



ρ-dependent termination

A form of transcription termination in

prokaryotes that depends on the protein ρ as well as on seuences in the DNA/RNA.



─10 box Common promoter element in E. coli. Named for its location approximately 10 bases upstream of the transcription start site.

3’?5’ exonuclease activity Function of DNA polymerases. Allows 3’?5’ removal of incorrect nucleotides after polymerization. See also exonuclease.

30nm fiber

An higher-level structure of chromatin. The



附录C：名词解释

α螺旋

蛋白质中一种螺旋形的二级结构。复数：α helices。 α鹅膏蕈碱

一种能不同程度地抑制三种真核生物RNA聚合酶的毒素。名称来自于产生此毒素的Amanita属蘑菇。 β-半乳糖苷酶

将乳糖分解为半乳糖和葡萄糖的酶。名称来源：该酶切割的键称为β-半乳糖苷键。

β折叠

蛋白质的一种二级结构，相对平坦，在两条平行的或反向平行的肽段之间形成氢键。 σ亚基

原核生物RNA聚合酶全酶的组成成分。在启动子识别中需要。 ρ依赖型终止

原核生物中的一种转录终止方式，依赖于ρ蛋白和DNA/RNA序列引起转录终止。

─10框

大肠杆菌中常见的启动子元件。由于它位于转录起始位点上游约10个碱基处而得名。 3’?5’

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