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

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

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

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