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

Lactobacilli
all of these
E.coli
Microaerophillic bacteria

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

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Cell Cultivations
Balanced growth is defined as

balancing the growth while controlling the pH
cultures undergoing balanced growth while maintaining a constant chemical composition
balancing the growth while controlling the temperature
balancing the growth while changing the nutrient composition

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