(A) Rhizobium

(B)Clostridium

(C)Azotobacter

(D)Klebsiella

(A) mosses

(B)bacteria

(C)green algae

(D)soil fungi

(A) both require the environment of a cell to replicate

(B)they require both RNA and DNA

(C)they both need food molecules

(D)they both require oxygen for respiration

(A) can induce root nodules on many plant species

(B)cannot fix nitrogen in the free-living state

(C)forms specialized vesicles in which the nitrogenase is protected from oxygen by a chemical barrier involving triterpene hepanoids

(D)like Rhizobium, it usually infects its host plant through root hair deformation and stimulates cell proliferation in the host's cortex

(A) They are also called PPLO

(B)They are pleomorphic

(C)They are sensitive to penicillin

(D)They cause disease in plants

(A) chemosynthetic bacteria

(B)pathogenic bacteria

(C)symbiotic bacteria

(D)mould

(A) 700 x 30 nm

(B)300 x 10 nm

(C)300 x 5 nm

(D)300 x 18 nm

(A) marine archaebacteria

(B)thermophilic sulphur bacteria

(C)hot-spring blue-green algae (cyanobacteria)

(D)thermophilic, subaerial fungi

(A) double stranded RNA

(B)single stranded RNA

(C)polyribonucleotides

(D)proteinaceous

(A) Transfer of some genes from one bacteria to another bacteria through virus

(B)Transfer of genes from one bacteria to another bacteria by conjugation

(C)Bacteria obtained its DNA directly

(D)Bacteria obtained DNA from other external source