Cell Cultivations
Semi-solid media, prepared with agar at concentrations of 0.5% or less are useful for the cultivation of

Lactobacilli
E.coli
Microaerophillic bacteria
all of these

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Cell Cultivations
The archaebacterium Halobacterium, an extreme halophile, and Sulfolobus, a thermoacidophile, can be cultured in the presence of antibiotics such as streptomycin and chloramphenicol because

they contain ether-linked isoprenoids in their plasma membrane
they contain 80S, as opposed to 70S, ribosomes
they lack murein in their cell wall
All of these

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