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Discoveries in Microbiology (GATE)

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Propionibacterium acne type zappa was discovered in 2014. This bacterium colonises which of the following?

  1. Faces of teenagers

  2. Bark of grapevine

  3. Fruits of grapevine

  4. Vagina of spinsters


Correct Option: B
Explanation:

The bacterium Propionibacterium acne type zappa colonises bark tissues and the pith of grapevine where the bacterium can localise intracellularly. This bacterium is the first evidence of human to plant obligate transfer.

On May 23, 2014, the International Institute for Species Exploration (IISE) declared Tersicoccus phoenicis as one of its 'Top 10 New Species of 2014'. This bacterium was identified in which of the following?

  1. Spacecraft

  2. Space station

  3. Mars

  4. Polar regions


Correct Option: A
Explanation:

Tersicoccus phoenicis was identified in the clean room facilities of the spacecraft. They are able to survive the hard sterilisation procedures used to sterilise the clean rooms of the spacecraft.

Lactocillin, a novel antibiotic found in 2014, inhibits Staphylococcus aureus. It was isolated from which of the following?

  1. Armpit biome

  2. Oral biome

  3. Soil biome

  4. Vaginal biome


Correct Option: D
Explanation:

Lactocillin is produced by an organism of the vaginal biome. It was isolated from Lactobacillus bacterium, which resides in the vagina.

In January 2014, Streptomyces chilikensis and Streptomyces barkulensis were discovered in Chilika lagoon. Which of the following is not a property of these bacteria?

  1. They can tolerate extreme pH.

  2. They can tolerate extreme temperature.

  3. They can tolerate extreme salinity.

  4. They produce protease and lipase.


Correct Option: B
Explanation:

Streptomyces chilikensis and Streptomyces barkulensis cannot tolerate extreme temperature.

Teixobactin was discovered using a new method of culturing bacteria in soil in 2015. Which of the following organisms produces this antibiotic?

  1. Bacillus lentus

  2. Micrococcus roseus

  3. Streptococcus tigurinus

  4. Eleftheria terrae


Correct Option: D
Explanation:

Eleftheria terrae produces teixobactin. It was previously an unculturable bacterium, which was cultured in the soil. It is active against Staphylococcus aureus or Mycobacterium tuberculosis.

Nitrososphaera viennensis, an archaic bacterium, was discovered in the soil from the gardens of the Faculty of Ecology at the University of Vienna in 2014. Which of the following is true about this bacterium?

  1. It produces an antibiotic.

  2. It causes nitrate reduction.

  3. It can oxidise ammonia.

  4. It aids in denitrification.


Correct Option: C
Explanation:

Correct Answer: It can oxidise ammonia.

A large outbreak of drug resistant bacteria at Lutheran General Hospital in northeast Illinois occurred in 2014. It was linked to procedures performed at the hospital and infected forty-four patients. Which of the following bacteria were responsible for this outbreak?

  1. Vancomycin-resistant enterobacteriaceae

  2. Carbapenem-resistant enterobacteriaceae

  3. Methicillin-resistant enterobacteriaceae

  4. Oxazolidinone-resistant enterobacteriaceae


Correct Option: B
Explanation:

The bacteria responsible for the outbreak at Lutheran hospital were Carbapenem-resistant enterobacteriaceae. Carbapenems are often referred to as last-resort antibiotics. These bacteria possessed enzymes which can deactivate Carbapenem, making them resistant to this antibiotic.

Of the thirty-six known species of Borrelia, twelve are known to cause Lyme disease. Which of the following is the Lyme disease causing species of Borrelia that was discovered in 2016 at Mayo Clinic in Rochester, Minnesota?

  1. Borrelia afzelii

  2. Borrelia burgdorferi

  3. Borrelia mayoni

  4. Borrelia garinii


Correct Option: C
Explanation:

Borrelia mayoni was discovered in 2016. It causes Lyme disease. Illness caused by B. mayonii is similar to that caused by B. burgdorferi, but with a few possible differences. B. mayonii is associated with nausea and vomiting, diffuse rashes and a higher concentration of bacteria in the blood.

Which of the following bacteria can eat pure electrons?

a. Shewanella b. Prevotella c. Geobacter d. Providencia

  1. Only a and b

  2. Only a and c

  3. Only b and d

  4. Only c and d


Correct Option: B
Explanation:

Geobacter and Shewanella eat pure electrons.

Ideonella sakaiensis was identified in 2016 by a team of researchers from Kyoto Institute of Technology and Keio University. What is the potential importance of this bacterium?

  1. Degradation of PCBs (polychlorinated biphenyls)

  2. Recycling of PET (polyethylene terephthalate) plastics

  3. Production of methane

  4. Leaching of copper


Correct Option: B
Explanation:

Ideonella sakaiensis has potential of recycling of PET plastics. The bacterium was observed to utilise two distinct enzymes that reacted with water to break down PET (polyethylene terephthalate) plastics.

Which of the following viruses was discovered by Dr. Bas E. Dutilh in 2014 at Radboud University Medical Centre in Netherlands that keeps us healthy by preying on bacteroides?

  1. Bacteriophage

  2. Crassphage

  3. T4 phage

  4. GB124 phage


Correct Option: B
Explanation:

Dr. Bas E. Dutilh at Radboud University Medical Centre in Netherlands discovered crassphage. It keeps us healthy by preying on bacteroides. This virus infects bacteroides, which can be pathogens for humans.

Which of the following was/were produced in 2015 using action of bacterial strain Komagataeibacter sucrofermentans DSM 159731 on industrial wastes?

  1. Cellulose

  2. Pectin

  3. Antibiotics

  4. Gold


Correct Option: A
Explanation:

The bacterial strain Komagataeibacter sucrofermentans DSM 15973 was used for the production of bacterial cellulose from industrial wastes in 2015.

In September 2014, Genome Institute of Singapore reported three bacteria which can destroy PCBs (polychlorinated biphenyls). These bacteria belonged to which of the following genera?

  1. Rhodococcus

  2. Dehalogenimonas

  3. Dehalococcoides

  4. Ruminococcus


Correct Option: C
Explanation:

The scientist at Genome Institute of Singapore, in 2014, discovered three powerful bacteria from a genus called Dehalococcoides. They can degrade PCBs.

GlaxoSmithKline closed its US plant in 2015 after the cooling tower tested positive for a deadly bacterium. Which of the following bacteria was found in its cooling tower?

  1. Vibrio cholerae

  2. Legionella pneumophila

  3. Klebsiella pneumoniae

  4. Borrelia vincenti


Correct Option: B
Explanation:

Legionella pneumophila was found in the cooling tower of the US plant. This bacterium causes a lethal form of pneumonia.

Bdellovibrio is a genus of parasitic bacteria. It was discovered in 2016 from which of the following samples?

  1. Urine

  2. Saliva

  3. Sweat

  4. Cerumin


Correct Option: B
Explanation:

Bdellovibrio is entirely dependent on the other bacteria it infects. It was discovered in 2016 from saliva. It is an ultra-small bacteria and lives on the surface of other bacteria, which makes its host more harmful to humans.

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