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