Cell Cultivations
The size of a single plant cell is usually within the range of

10-20μm in diameter and 25-100μm long
60-80μm in diameter and 300-400μm long
20-40μm in diameter and 100-200μm long
40-60μm in diameter and 200-300μm long

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

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