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☆☆☆☆☆The bacterium that cannot tolerate oxygen is Anaerobes, but there are different kinds and each has different tolerances when it comes to oxygen. Obligate Anaerobes can get killed by oxygen. Facultative anaerobes those can grow without oxygen. Aero-tolerant anaerobes they never use oxygen BUT they can tolerate it. Microaerophiles require i tiny bit of oxygen but anymore than the little bit they need and they cannot grow.
species
Evolution began 3 billion years ago, when the first life forms appeared on Earth.
unicellular
Homozygotes for one allele are favored over all others.
An electron microscope is necessary to actually see a virus.
Viroid
virus
chicken pox
They all cause disease.
Plasmodium, which is transmitted by mosquitoes, causes malaria in tropical areas.
Prion
The additional protective layer of protein that surrounds some viruses is called the capsid, wjich protects the virus' gebetic material.
Genetic exchanges among bacteria occur by several mechanisms. In transformation, the recipient bacterium takes up extracellular donor DNA. In transduction, donor DNA packaged in a bacteriophage infects the recipient bacterium. In conjugation, the donor bacterium transfers DNA to the recipient by mating.
