Cell Cultivations
The cell mass can be measured optically by determining the amount of light scattered by a suspension of cells. The measurements are usually at a wavelength of

400-500nm
600-700nm
500-600nm
300-400nm

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

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