Cell Cultivations
Which of the following is not an indirect method for the measurement of cell mass?

Cell dry weight
Viscosity
Heat evolution
Nutrient composition

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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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