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

Nutrient composition
Heat evolution
Cell dry weight
Viscosity

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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
they contain ether-linked isoprenoids in their plasma membrane
All of these

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