- In the process of denitrification the involved bacteria is/are _
(A) Thiobacillus denitrificans
(B) Micrococcus denitrificans
(C) Both A and B
(D) None of the above
Ans. C
- Nitrifying bacteria is/are __
(A) Autotrophs
(B) Heterotrophs
(C) Biotrophs
(D) All of the above
Ans. B
- Vitamin B2 is also known as __
(A) Thiamine
(B) Riboflavin
(C) Pyridoxine
(D) None of the above
Ans. B
- In which phase of microbial growth the bacteria increases in cell mass
(A) Log phase
(B) Lag phase
(C) Stationary phase
(D) Decline phase
Ans. B
- In which phase cells divide at the maximum rate permitted by the composition of the medium
(A) Log phase
(B) Lag phase
(C) Stationary phase
(D) Decline phase
Ans. A
- The stage where viable cell number does not increase
(A) Log phase
(B) Lag phase
(C) Stationary phase
(D) Decline phase
Ans. D
- Which is known as baker’s yeast
(A) Aspergillus niger
(B) Penicillium notatum
(C) Saccharomyces cerevisiae
(D) Eremothecium gossypii (Ashbya gossypii)
Ans. C
- Azospirillum is a __ bacterium
(A) Symbiotic
(B) Asymbiotic
(C) Associative
(D) All of the above
Ans. C
- Rhizobium is a _ bacterium
(A) Symbiotic
(B) Asymbiotic
(C) Associative
(D) All of the above
Ans. A
- Pseudomonas striata and Bacillus megaterium is known as _
(A) Nitrogen fixing bacteria
(B) PSB
(C) VAM
(D) None of the above
Ans. B
- Algae used in the production of single cell protein
(A) Aspergillus niger
(B) Penicillium notatum
(C) Spirulina maxima
(D) Eremothecium gossypii (Ashbya gossypii)
Ans. C
- Prokaryotes range from _ µm in diameter
(A) 0.05 to 0.1
(A) 0.05 to 1.0
(C) 0.5 to 2.0
(D) 2.0 to 20
Ans. C
- Which of the following antibiotic blocks the peptidoglycan synthesis
(A) Kanamycin
(A) Erythromycin
(C) Penicillin
(D) Streptomycin
Ans. C
- The study of algae is called _
(A) Mycology
(B) Bacteriology
(C) Phycology
(D) Immunology
Ans. C
- Mycoplasma lack which of the following cell structure
(A) DNA
(B) Cell wall
(C) RNA
(D) Ribosome
Ans. B
- Barophilic means
(A) Microorganism lives at high temperature
(B) Microorganism lives at high pressure
(C) Microorganism lives at alkaline condition
(D) Microorganism lives at acidic condition
Ans. A
- Most usable form of nitrogen
(A) Ammonia
(B) Nitrate
(C) Nitrite
(D) Nitrous oxide
Ans. B
- The most numerous groups of microorganism found in soil is __
(A) Fungus
(B) Protozoa
(C) Algae
(D) Bacteria
Ans. D
- Free living bacteria that fix the atmospheric Nitrogen
(A) Nitrosomonas
(B) Nitrobacter
(C) Rhizobium
(D) Azotobacter
Ans. D
- VAM is a __
(A) Fungus
(B) Algae
(C) Bacteria
(D) Protozoa
Ans. A
