How is a bacterial strain defined? - Biology Stack Exchange
2016年1月22日 · 1. In theory they're clones, but depending on the age of the strain (some strains are surprisingly old: ~40 years) there's variation inside strains. The reverse is also true. …
Are we "more evolved" than present-day bacteria?
2018年3月10日 · Under this definition, humans are clearly more evolved than bacteria: Humans have close to 20.000 protein coding genes, while bacteria have somewhere between 1500 …
Is there any non-pathogenic gram negative bacteria?
2018年3月29日 · You will be left with all Gram-negative bacteria for which pathogenicity is not known. As Canadianer already mentioned in the comments, the majority of bacteria (this …
Why are bacteria and archaea in different domains?
2013年1月7日 · It is told that archaea (former archaebacteria) though showing prokaryotic cells like bacteria (former eubacteria) ; archaea have more evolutionary affinity with eukaryote …
What defines a microbial species? - Biology Stack Exchange
2017年12月17日 · Microbe is not a taxonomic unit: there are no microbial species. --- "Microbe" is "an extremely minute living being"---one needs a microscope to see it. And what is the …
Difference between Genus, Genus sp. and Genus spp
6. Wikipedia: Books and articles sometimes intentionally do not identify species fully and use the abbreviation "sp." in the singular or "spp." (standing for species pluralis, the Latin for multiple …
How is the concept of species defined in asexual organisms?
2017年4月14日 · Sometimes asexual species have rapid life cycles (eg. bacteria) and therefore evolutionary change can occur rapidly. Horizontal gene transfer can occur transmitting DNA …
What is the fastest growing bacterium? - Biology Stack Exchange
2014年8月19日 · In a study searching for thermophilic sulfate reducing bacteria in this extreme environment, a spore-forming bacterium was discovered that grew with a doubling time as …
dna - How much natural genetic variation is there between …
20% variability within a species. 20%, one species. E.coli is an extreme example, but still, species is a stupid concept. Here's a 2006 paper finding that plenty of unique Campylobacter proteins …
When has an organism evolved enough to be called a new species?
Bacteria of the same species, or even very different species, can freely transfer genes from one to the other in conjugation, which combined with fission can result in perfectly replicable hybrids. …