(A) They are also called PPLO

(B)They are pleomorphic

(C)They are sensitive to penicillin

(D)They cause disease in plants

(A) Rhizobium

(B)Clostridium

(C)Azotobacter

(D)Klebsiella

(A) methophilic bacteria

(B)butyric acid bacteria

(C)Helicobacter pylori

(D)Streptococcus lactis

(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) neither syngamy nor reduction division

(B)distinct chromosomes are absent

(C)no conjugation

(D)no exchange of genetic material

(A) 700 x 30 nm

(B)300 x 10 nm

(C)300 x 5 nm

(D)300 x 18 nm

(A) Xanthomonas

(B)Pseudomonas

(C)Alternaria

(D)Erwinia

(A) leucoplasts

(B)chloroplasts

(C)chromoplasts

(D)chromatophores

(A) can be circular as well as linear within the same cell

(B)are always circular

(C)are always linear

(D)can be either circular or linear, but never both within the same cell

(A) symbiotic nitrogen-fixers

(B)non-symbiotic nitrogen-fixers

(C)ammonifying bacteria

(D)disease-causing bacteria