Tag: classification of microbes

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

Which of the following options is correct?

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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

  1. (ii) and (iii)

  2. (i) and (ii)

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

  4. (i) (ii) and (iv)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Statements (i), (ii), and (iv) are correct. (iii) is incorrect because chemosynthetic autotrophic bacteria do not synthesize cellulose; they typically fix carbon using chemical energy.

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

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

  1. are photosynthetic

  2. do not always need oxygen

  3. are killed in an oxygenated environment

  4. require a constant supply of oxygen
Reveal answer Fill a bubble to check yourself
B Correct answer
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'.

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

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

  1. Heterotrophic nutrition

  2. Prokaryotic organisation

  3. Presence of flagella

  4. Rigid cell wall
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

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

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

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

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

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
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'.
Multiple choice botany the living world archaebacteria the three domains of life classification of microbes

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

  1. Thermoacidophile

  2. Halophile

  3. Methanogen

  4. Parasitic forms
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.