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Bacteria (GATE - XL)

Description: Microbiology
Number of Questions: 15
Created by:
Tags: Microbiology Bacteria Bacterial classification Industrial microbiology Microbes Photosynthesis spirochetes Archea parasites diseases GATE CSIR NET Life sciences Microbial Taxonomy and Diversity Role of Microorganisms in Transformation of Organic Matter and in the Causation of Diseases. Bacteria, Archea and Their Broad Classification Microbial Diseases and Host Pathogen Interaction Microbial Metabolism
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Which of the following is a pair of bacteria belonging to class Alphaproteobacteria?

  1. Brucella and Azospirillum

  2. Bordetella and Neisseria

  3. Chromatium and Legionella

  4. Desulfovibrio and Myxococcus

  5. Campylobacter and Helicobacter

Show answer
Correct Option: A
Explanation:

Brucella is a member of order Rhizobiales, class Alphaproteobacteria, phylum Proteobacteria. Azospirillum is a member of order Rhodospirillales, class Alphaproteobacteria, phylum Proteobacteria.

Which of the following bacterial genera is employed in sewage treatment process?

  1. Azotobacter

  2. Brucella

  3. Erwinia

  4. Pelagibacter

  5. Zoogloea

Show answer
Correct Option: E
Explanation:

The genus Zoogloea is important in the context of aerobic sewage-treatment processes such as the activated sludge system. As they grow, Zoogloea bacteria form fluffy, slimy masses that are essential to the proper operation of such systems.

All of the following are examples of anoxygenic photosynthetic bacteria, except

  1. Anabaena

  2. Chlorobium

  3. Chloroflexus

  4. Chromatium

  5. Rhodospirillum

Show answer
Correct Option: A
Explanation:

Anabaena is an oxygenic photosynthetic bacteria belonging to phylum Cyanobacteria.

Which of the following diseases is not caused by spirochetes?

  1. Syphilis

  2. Relapsing fever

  3. Lyme disease

  4. Leptospirosis

  5. Tetanus

Show answer
Correct Option: E
Explanation:

Tetanus is caused by Clostridium tetani (Firmicutes).

Match the following:

 
Group I Group II
P. Clostridium botulinum 1. Facultative anaerobe
Q. Staphylococcus aureus 2. Obligate anaerobe
R. Mycobacterium tuberculosis 3. Aerobic
S. Campylobacter jejuni 4. Microaerophilic

  1. P - 1; Q - 2; R - 3; S - 4

  2. P - 1; Q - 3; R - 2; S - 4

  3. P - 2; Q - 1; R - 3; S - 4

  4. P - 2; Q - 1; R - 4; S - 3

  5. P - 3; Q - 2; R - 1; S - 4

Show answer
Correct Option: C
Explanation:

Clostridium botulinum is an obligate anaerobe. Staphylococcus aureus is a facultative anaerobe. Mycobacterium tuberculosis is aerobic. Campylobacter jejuni is microaerophilic.

Identify the obligate intracellular parasite(s) from the following:

  1. Rickettsia
  2. Coxiella
  3. Chlamydia

  1. Only 1

  2. Only 2

  3. Only 3

  4. All of the above

  5. None of these

Show answer
Correct Option: D
Explanation:

Obligate intracellular parasites cannot reproduce outside their host cell. All the three are obligate intracellular parasites.

Which of the following pairs is incorrectly matched?

  1. Moraxella : Anaerobic coccobacilli

  2. Neisseria : Aerobic, gram-negative cocci

  3. Francisella : Pleomorphic bacteria

  4. Pseudomonas : Aerobic, gram-negative rods

  5. Brucella : Non-motile coccobacilli

Show answer
Correct Option: A
Explanation:

Members of the genus Moraxella are strictly aerobic coccobacilli, i.e. intermediate in shape between cocci and rods.

Which of the following diseases is not caused by a member of order Enterobacteriales?

  1. Typhoid

  2. Bacillary dysentery

  3. Tetanus

  4. Pneumonia

  5. Plague

Show answer
Correct Option: C
Explanation:

Tetanus is caused by Clostridium tetani (order Clostridiales).

Which of the following photosynthesising bacteria belong to phylum Proteobacteria?

  1. Anabaena 2. Chlorobium 3. Rhodospirillum 4. Chromatium

  1. 1 and 2

  2. 1 and 4

  3. 2 and 3

  4. 2 and 4

  5. 3 and 4

Show answer
Correct Option: E
Explanation:

Both Rhodospirillum and Chromatium belong to phylum Proteobacteria.

Match the following:

 
Column I Column II
P. Azotobacter 1. Alphaproteobacteria
Q. Nitrobacter 2. Betaproteobacteria
R. Stigmatella 3. Gammaproteobacteria
S. Thiobacillus 4. Deltaproteobacteria

  1. P - 1; Q - 2; R - 3; S - 4

  2. P - 2; Q - 1; R - 4; S - 3

  3. P - 2; Q - 3; R - 1; S - 4

  4. P - 3; Q - 1; R - 4; S - 2

  5. P - 4; Q - 2; R - 3; S - 1

Show answer
Correct Option: D
Explanation:

Azotobacter belongs to order Pseudomonadales of class Gammaproteobacteria. Nitrobacter belongs to order Rhizobiales of class Alphaproteobacteria. Stigmatella belongs to order Myxococcales of class Deltaproteobacteria. Thiobacillus belongs to order Hydrogenophilales of class Betaproteobacteria.

Which of the following bacteria does not belong to phylum Firmicutes?

  1. Clostridium

  2. Sarcina

  3. Streptobacillus

  4. Bacillus

  5. Streptococcus

Show answer
Correct Option: C
Explanation:

Streptobacillus belongs to order Fusobacteriales of phylum Fusobacteria.

All of the following are bacteria belonging to order Enterobacteriales of phylum Gammaproteobacteria, except

  1. Enterobacter

  2. Erwinia

  3. Proteus

  4. Azotobacter

  5. Serratia

Show answer
Correct Option: D
Explanation:

Azotobacter belongs to order Pseudomonadales phylum Gammaproteobacteria.

Which of the following bacteria is not an example of spirochetes?

  1. Treponema

  2. Spirillum

  3. Leptospira

  4. Borrelia

  5. None of these

Show answer
Correct Option: B
Explanation:

An important morphological difference from the helical spirochetes is that Spirillum bacteria are motile by conventional polar flagella, rather than axial filaments. This is why Spirilum is not classified as spirochete.

Which of the following bacteria are examples of free-living nitrogen fixers?

  1. Rhizobium 2. Beijerinckia 3. Bradyrhizobium 4. Azomonas 5. Azotobacter

  1. 1, 2 and 3

  2. 1, 3 and 5

  3. 2, 3 and 4

  4. 2, 4 and 5

  5. 3, 4 and 5

Show answer
Correct Option: D
Explanation:

Beijerinckia, Azomonas and Azotobacter: All are free-living nitrogen fixers.

Match the following:

 
Column I Column II
P. Chloroflexus 1. Purple non-sulphur bacteria
Q. Chlorobium 2. Purple sulphur bacteria
R. Rhodospirillum 3. Green non-sulphur bacteria
S. Chromatium 4. Green sulphur bacteria

  1. P - 1; Q - 2; R - 3; S - 4

  2. P - 2; Q - 1; R - 4; S - 3

  3. P - 3; Q - 1; R - 4; S - 2

  4. P - 3; Q - 4; R - 1; S - 2

  5. P - 3; Q - 1; R - 2; S - 4

Show answer
Correct Option: D
Explanation:

Correct matching is: Chloroflexus: Green non-sulphur bacteria Chlorobium: Green sulphur bacteria Rhodospirillum: Purple non-sulphur bacteria Chromatium: Purple sulphur bacteria

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