prokaryotic initiation factor 1 《英文msh词典》Prokaryotic Initiation Factor 1 ; [入口词] Prokaryotic Initiation Factor 1 ; [主题词] Prokaryotic Initiation Factor-1 ; [英文释义] The smallest of the three prokaryotic initiation factors with a molecular size of approximately 8 kD. It binds near the A-site of the 30S subunit of RIBOSOMES and may play a role in preventing premature addition of aminoacyl-tRNA-linked PEPTIDE ELONGATION FACTOR TU to the ribosome during PEPTIDE CHAIN INITIATION.
prokaryotic initiation factor 2 《英文msh词典》Prokaryotic Initiation Factor 2 ; [入口词] Prokaryotic Initiation Factor 2 ; [主题词] Prokaryotic Initiation Factor-2 ; [英文释义] The largest of the three prokaryotic initiation factors with a molecular size of approximately 80 kD. It functions in the transcription initiation process by promoting the binding of formylmethionine-tRNA to the P-site of the 30S ribosome and by preventing the incorrect binding of elongator tRNA to the translation initiation site.
This has led to the theory ( endosymbiont theory ) that eukaryotes arose as a result of symbiotic associations between prokaryotes 这就形成了真核生物中某些细胞器来自于共生的原核生物的理论(内共生理论)。
In prokaryotes the nuclear material is simply a circular strand of dna, not complexed with histone proteins, and cell division is amitotic 在原核生物中,核物质仅是一个简单的环状dna,而不与组蛋白结合,并且细胞为无丝分裂。
Flagellum ( pl . flagella ) a whiplike extension of prokaryote cells, with a basal body at its base, whose beat causes locomotion of the cell 鞭毛:原核细胞的鞭状延长部分,基部有基体,当鞭毛进行挥鞭式运动时可以促使细胞移动。
prokaryote ( prokaryote ) an organism whose genetic material ( dna ) is not enclosed by membranes to form a nucleus but lies free in the cytoplasm 原核生物:指遗传物质(dna)没有被膜包围形成细胞核,而是在细胞质中游离存在的一类生物体。
Prokaryote ( prokaryote ) an organism whose genetic material ( dna ) is not enclosed by membranes to form a nucleus but lies free in the cytoplasm 原核生物:指遗传物质(dna)没有被膜包围形成细胞核,而是在细胞质中游离存在的一类生物体。
Recent molecular evidance suggests the prokaryotes actually comprise two distinct kingdoms, or even domains, the archaea and the eubacteria or bacteia 近来的分子生物学研究证据表明原核生物实际上包含两个不同的界或域,即古细菌和真细菌或细菌。
5-enolpyruvlshimimate-3-phosphate synthase ( epsp synthase ) is a necessary enzyme of the shikimate pathway in prokaryote, yeasts, fungi, apicomplexan parasites, plants and algae 原核生物、酵母、真菌、顶配位寄生虫、植物和藻类中的epsp合成酶是芥草酸途径中的一个氨基酸必需酶。
Similarly, biologists have assumed that the absence of introns from prokaryotes was a consequence of intense competitive pressures in the microbial environment : evolution had pruned away the introns as deadweight 生物学家也以类似的想法,假设原核生物之所以缺乏插入子,是因为微生物处于竞争激烈的环境中的结果:插入子的重担被演化给修剪掉了。
Many, though not all, terrestrial prokaryotes ( simple one-celled organisms such as bacteria that lack a membrane-bound nucleus ) and eukaryotes ( organisms with well-defined nuclei ) could survive this temperature range 地球上许多原核生物(简单的单细胞生物,没有细胞核结构,如细菌)与真核生物(有清楚细胞核结构的生物)都能存活于前述的温度?围内。
Bioinformatical analysis of pprl : pprl is the first orf in what appears to be a four-gene operon containing homologues of three genes ( folp, folb and folk ) in the folate biosynthetic pathway described in other prokaryotes ppri的生物信息学分析:ppri是4个紧密相连基因的第一个基因,后面的三个分别是folp、folb、folk的同源物,它们参与叶酸的生物合成,因此ppri在基因组中的位置有点特殊。