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

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

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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

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

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