Paramecium has two types of nucleus, a larger macronucleus involved with the vegetative activities and a smaller involved with reproduction.

Correct Option: D

Paramecium has two types of nucleus, a larger macronucleus involved with the vegetative activities and a smaller involved with reproduction.

While working at the Rockrfeller Institute, Brown reported isolation of a PPLO from human arthritic joint tissue in 1938. In 1949, Diennes reported to the 7th International Rheumatology Congress, the isolation of PPLO from the genitourinary tracts of men afflicted with arthritis. In discussing the significance of this observation, Brown reported successful treatment of arthritic patients in 1949 with a new antibiotic called aureomycin (Clark, 1997).

Correct Option: B

While working at the Rockrfeller Institute, Brown reported isolation of a PPLO from human arthritic joint tissue in 1938. In 1949, Diennes reported to the 7th International Rheumatology Congress, the isolation of PPLO from the genitourinary tracts of men afflicted with arthritis. In discussing the significance of this observation, Brown reported successful treatment of arthritic patients in 1949 with a new antibiotic called aureomycin (Clark, 1997).

Thermococcus, Methanococcus and Methanobacterium exemplify archaebacteria that contain protein homologous to eukaryotic core histones.

Correct Option: A

Thermococcus, Methanococcus and Methanobacterium exemplify archaebacteria that contain protein homologous to eukaryotic core histones.

A domain of prokaryotic organisms containing the archaebacteria including the methanogens, which produce methane; the thermoacidophilic bacteria, which live in extremely hot and acidic environments, & the halophilic bacteria, which can only function at high salt concentrations are abundant in the world’s oceans.

Correct Option: B

A domain of prokaryotic organisms containing the archaebacteria including the methanogens, which produce methane; the thermoacidophilic bacteria, which live in extremely hot and acidic environments, & the halophilic bacteria, which can only function at high salt concentrations are abundant in the world’s oceans.

Bacterial leaf blight of rice is caused by a species of Xanthomonas. Mature rice plant are infected by these bacteria, lesion begins as water soaked stripes on the leaf blades and eventually would increase in length and width becoming yellow to grayish-white until the entire leaf dries up.

Correct Option: A

Bacterial leaf blight of rice is caused by a species of Xanthomonas. Mature rice plant are infected by these bacteria, lesion begins as water soaked stripes on the leaf blades and eventually would increase in length and width becoming yellow to grayish-white until the entire leaf dries up.