microbiology - Why do different bacteria have different shapes ...
2013年10月10日 · Reasons for Bacteria with different shapes as given in Wikipedia/Bacteria:. The wide variety of shapes is determined by the bacterial cell wall and cytoskeleton, and is important because it can influence the ability of bacteria to acquire nutrients, attach to surfaces, swim through liquids and escape predators.
molecular biology - Why do some bacteria have most genes on …
2015年3月10日 · Rapidly growing bacteria are replicating their genomes most or all of the time, so you've got replication and transcription happening at the same time. If genes are on the lagging strand, RNA transcription proceeds in the opposite direction from DNA replication, and the DNA polymerase will often collide with the RNA polymerase.
Why do chromosome pairs have different shapes and sizes?
2021年8月28日 · $\begingroup$ Think of the chromosomes as a bunch of ropes of different lengths (i.e. size in base pairs). if you quickly try to sort out a bunch of ropes on the ground with a long pole from a platform 50 feet up (basically how karyotype images are created), do you expect the ropes to be straight, or for some of them to have some wiggle? $\endgroup$
evolution - Why don’t different organisms have nucleic acid …
2016年9月9日 · If that putative selective event was different, then perhaps all the pentose-based species would have died off, and we would all have hexose-based genetic material. We don't know how many different genetic material recipes were tried out before this one "won". Evolution can only work on, or select, or select against, the current batch of organisms.
Why do bacteria die in a high sugar content environment?
In short our environment always tries to maintain an equilibrium, a stable state. When microbes encounter a surrounding like a high concentrated sugar state or solution (hypertonic), water diffuses out of the permeable cellular membrane of the microbe to its outer environment with high sugar concentration causing dehydration of the microbe and it leads to shrinking of cell.
Distinguishing between yeast and bacteria - cell biology
2022年3月6日 · Keep in mind that there are (roughly) two major kinds of bacteria - Gram positive and negative - and they have different types of cell walls. Also, remember that different bacteria range in size from tiny to gigantic. $\endgroup$
Are all single-celled organisms Bacteria? - Biology Stack Exchange
2014年11月4日 · You can find more about the bacteria domain at the wikipedia page (It's a long and complex history which is hard to summarise here) and about the domains here. This last defines bacteria loosely consisting of " prokaryotic cells possessing primarily diacyl glycerol (DAG) diester lipids in their membranes and bacterial rRNA, no nuclear membrane ...
microbiology - Do different species of bacteria have distinct ...
2017年3月3日 · In addition to the answer above, there is a 1954 research paper written by Shibata, Bensen and Calvin freely available from the Berkeley Lab of the University of California which should give you the theoretical background, experimental methodology as well as some data on the absoprtion spectra of different micro-organisms including bacteria:
Two different sized colonies from the same species of bacteria.
Bacteria was subcultured from the positive result giving culture bottle from the BacT/Alert system and incubated overnight at 35 degree celsius. Two different sized colonies were found and they were subjected to biochemical and antisera tests and both identified as Salmonella Paratyphi.
bacteriology - Can different bacteria strains of same species have ...
2016年12月10日 · There are many different strains, categorized by the plant hosts they cause disease on. This host range is determined by different collections of virulence genes in their genomes. So although they are the same species, they can be remarkably different in their genomes. See this (open access) paper by Baltrus, et al for more information.