15. The archaebacterium Halobacterium, an extreme halophile, and Sulfolobus, a thermoacidophile, can be cultured in the presence of antibiotics such as streptomycin and chloramphenicol because
A.they contain ether-linked isoprenoids in their plasma membrane
B.they lack murein in their cell wall
C.they contain 80S, as opposed to 70S, ribosomes
D.all of the above
16. The isolation of the gonorrhoea - causing organisms, Neisseria gonorrhoeae,from a clinical specimen is facilitated by the use of media containing
A.cellulose
B.certain antibiotics
C.succinate
D.none of these
17. Anchorage -dependent cells require
A.wettable surface for growth
B.dry surface for growth
C.either (a) or (b)
D.nothing to do with the surface
18. Stringent anaerobes can be grown in a media by taking special measure as
A.boiling the media for several minutes
B.addition of cysteine
C.passing through oxygen-free nitrogen
D.any of these
19. Radical shifts in pH can be prevented by incorporating
A.a buffer
B.an oxidizing agent
C.a reducing agent
D.any of these
Page 3 of 3