Why bacteria are prokaryotes? Because they lack a distinct nuclear membrane, the organelles associated with energy generation, such as mitochondria and chloroplasts, and complex internal membranes, such as endoplasmic reticulum and Golgi apparatus, which are found in eukaryotes
Because they lack ：a distinct nuclear membrane, the organelles associated with energy generation, such as mitochondria and chloroplasts, and complex internal membranes, such as endoplasmic reticulum and Golgi apparatus, which are found in eukaryotes. Why bacteria are prokaryotes?
Bacteria are ubiquitous They are a highly successful and diverse group of organisms that can obtain energy and carbon from a wide range of sources and therefore can colonize(定居) every niche on our planet from deep ocean trenches to volcanic craters
They are a highly successful and diverse group of organisms that can obtain energy and carbon from a wide range of sources and therefore can colonize（定居） every niche on our planet from deep ocean trenches to volcanic craters. Bacteria are ubiquitous
1. eubacteria and archaebacteria In the 1970s, using dna sequencing information, it was found that the group we know as the bacteria could be split into two, the eubacteria(Gr eu, true and bakterion, a small rod) and the archaebacteria(Gr Archaios, ancient) and it appears that these two groups evolved away from each other very early in the history of living things at about the same time that the first group of eu karyotic cells evolved.(是一个在进化途径上 很早就与真细菌和真核生物相互独立的生物类群)
In the 1970s, using DNA sequencing information, it was found that the group we know as the bacteria could be split into two, the eubacteria (Gr. eu, true and bakterion, a small rod) and the archaebacteria (Gr. Archaios, ancient) and it appears that these two groups evolved away from each other very early in the history of living things at about the same time that the first group of eukaryotic cells evolved. （是一个在进化途径上 很早就与真细菌和真核生物相互独立的生物类群） 1. eubacteria and archaebacteria
On the basis of 16S RNA sequences, it is now clear that there are(at least) three domains of organisms, the two prokaryotic groups, archaebacteria and eubac-teria and the eukarya(Fig) Within the eubacteria there are at least 11 groups, referred to sometimes as phyla, which can be represented on a phylogenetic tree. What can be seen is the wide diversity within the bacterial world and that may be familiar to us such as E Coli, bacillus species are located within just a few of these phyla. It should be noted that the num ber of phyla will increase as more bacteria from diverse habitats are sequenced
On the basis of 16S RNA sequences, it is now clear that there are (at least) three domains of organisms, the two prokaryotic groups, archaebacteria and eubac-teria and the eukarya (Fig). Within the eubacteria there are at least 11 groups, referred to sometimes as phyla, which can be represented on a phylogenetic tree. What can be seen is the wide diversity within the bacterial world and that may be familiar to us such as E. Coli, bacillus species are located within just a few of these phyla. It should be noted that the number of phyla will increase as more bacteria from diverse habitats are sequenced
Green non-suifur bacteria Entamoebae molds Methanosarcina Gram Methano Plants Halophiles positives, bacterium Ciliates Methanococcus Purple Flagellates bacteria Thermoproteus Thermococcus celer Trichomonads Pyrodictium Microsporidial Diplomonads An overview of the phytogeny of the living world, showing the three major domains of organisms: the Eubacteria, the Archaebacteria and the Eukarya
An overview of the phytogeny of the living world, showing the three major domains of organisms: the Eubacteria, the Archaebacteria and the Eukarya