Cell Cultivations
The protoplast can be used to

all of these
modify genetic information
study plant viral infections
create plant hybrid

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

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