Tag: classification of microbes

Questions Related to classification of microbes

Which of the following options is correct?

botany the living world archaebacteria the three domains of life classification of microbes

  1. Heterocyst are thin-walled and help in nitrogen fixation

  2. Archaebacteria are oldest living

  3. Fossil cell wall of archaebacteria and eubacteria are different but cell membrane are similar

  4. Penicilllin is an effective against mycoplasma

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Correct Option: B
Explanation:

Archaebacteria are the oldest living organism. They can be found in some of the harshest environments. Traces of Archaebacteria have been seen in 3.8 billion-year-old fossil. Thus, are claimed as the oldest living organism. Heterocysts are nitrogen-fixing cells found in Nitrogen deprived cells of bacteria like cyanobacteria, Anabaena, Nostoc etc. Heterocyst synthesizes additional 3 layers of the cell wall, in turn, producing a THICK cell wall.The cell wall and cell membrane of archaebacteria both differ from that of eubacteria.The antibiotic, penicillin is ineffective against mycoplasma. So, the correct answer is option B.

Methanogens are _______________.

botany the living world archaebacteria the three domains of life classification of microbes

  1. Obligate anaerobes

  2. Found in salline marshes

  3. CO2 oxidizing forms

  4. Facultative anaerobes

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Correct Option: A

Select the correct statements among the following (i-iv) regarding the characteristics of certain organisms.
(i) Methanogens are archaebacteria which produce methane in marshy areas.
(ii) Nostoc is a filamentous blue-green alga which fixes atmospheric nitrogen.
(iii) Chemosynthetic autotrophic bacteria synthesize cellulose from glucose.
(iv) Mycoplasma lack a cell wall and can survive without oxygen

botany the living world archaebacteria the three domains of life classification of microbes

  1. (ii) and (iii)

  2. (i) and (ii)

  3. (ii) (iii) and (iii)

  4. (i) (ii) and (iv)

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Correct Option: D

Choose the correct answers from the alternatives given.
Which of the following is not grouped with archaebacteria?

botany the living world archaebacteria the three domains of life classification of microbes

  1. Methanogens

  2. Cyanobacteria

  3. Thermophiles

  4. Halophiles

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Correct Option: D
Explanation:

Haloarchaea are a class of the Euryarchaeota, found in water saturated.

So, the correct option is 'Halophiles'.

Bacteriorhodopsin pigment is associated with ________________.

botany the living world archaebacteria the three domains of life classification of microbes

  1. Red sea formation

  2. Red tide formation

  3. Complementary chromatic adaptation

  4. ATP formation

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Correct Option: A

Choose the correct answers from the alternatives given.
Facultative anaerobes:

botany the living world archaebacteria the three domains of life classification of microbes

  1. are photosynthetic

  2. do not always need oxygen

  3. are killed in an oxygenated environment

  4. require a constant supply of oxygen

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Correct Option: B
Explanation:

A facultative anaerobe is an organism that makes aerobic respiration if oxygen is absent.

So, the correct option is 'do not always need oxygen'.

Choose the correct answers from the alternatives given.
Which bacteria produces methane as byproduct

botany the living world archaebacteria the three domains of life classification of microbes

  1. Green sulphur

  2. Methanogens

  3. Blue-greens

  4. Rickettsias

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Correct Option: B
Explanation:
Methanogens are microorganisms that produce methane as a metabolic byproduct in hypoxic conditions. So the correct option is 'Methanogens'.

Choose the correct answers from the alternatives given.
Which of the following archaea would live at a deep-sea vent?

botany the living world archaebacteria the three domains of life classification of microbes

  1. Heterotrophic nutrition

  2. Prokaryotic organisation

  3. Presence of flagella

  4. Rigid cell wall

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Correct Option: D
Explanation:

Archaea have rigid cell walls which help in living at a deep-sea vent.

So, the correct option is 'Rigid cell wall'.

Choose the correct answers from the alternatives given.
During bacterial conjugation there is

botany the living world archaebacteria the three domains of life classification of microbes

  1. a partial but mutual exchange of genetic material between the conjugants

  2. only a partial transfer of genetic material from one conjugant to the other

  3. a mutual and complete exchange of genetic material between two conjugants

  4. a complete transfer of genetic material from one conjugant to the other

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Correct Option: D
Explanation:
Bacterial conjugation is the transfer of genetic material between bacterial cells by direct cell-to-cell contact or by a bridge-like connection between two cells. So the correct option is 'a complete transfer of genetic material from one conjugant to the other'.

Choose the correct answers from the alternatives given.
Which of the following archaea would live at a deep-sea vent?

botany the living world archaebacteria the three domains of life classification of microbes

  1. Thermoacidophile

  2. Halophile

  3. Methanogen

  4. Parasitic forms

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Correct Option: A
Explanation:

A thermoacidophile is an extremophilic microorganism that is both can grow under conditions of high temperature and low pH.

So, the correct option is 'Thermoacidophile'.