Tag: the three domains of life

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

Barophilic prokaryotes -

  1. Grow slowly in highly alkaline frozen lakes

    at high altitudes

  2. Grow and multiply in very deep marine

    sediments

  3. Readily grow and divide in sea water

    enriched in any soluble salt of barium

  4. Occur in water containing high

    concentrations of barium hydroxide
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Barophilic prokaryotes grow and multiply in very deep marine sediments. A barophilic prokaryote, also generally defined as a barophile, is a type of organism which occurs and exists at high-pressure zones, like a deep-sea bacteria and archaebacteria.
So, the correct answer is 'Grow and multiply in very deep marine sediments'. 
Multiple choice botany the living world archaebacteria the three domains of life classification of microbes

Which of the following are likely to be present in deep sea water ?

  1. Archaebacteria

  2. Eubacteria

  3. Blue-green algae

  4. Saprophytic fungi
Reveal answer Fill a bubble to check yourself
A,B Correct answer
Explanation

Archeabacteria are also known as extremophiles because of the ability to survive in extreme environmental conditions. The deep sea environment is characterized by increased pressure, low visibility, low in nutrition etc. Benthic zone also harbors bacteria

So, the correct answer is 'Archaebacteria and Eubacteria'

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

Obligate anaerobic archaebacreria with chemoautotrophic mode of nutrition are ____________.

  1. Mathanocens

  2. Halphiles

  3. Thermoacidophiles

  4. More than one option is correct
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Methanogens are obligate anaerobic archaebacteria that use carbon dioxide as an electron acceptor in a chemoautotrophic mode of nutrition, producing methane. They cannot survive in oxygen-containing environments and are found in places like marshes, swamps, and animal digestive systems. Halophiles prefer high-salt environments while thermoacidophiles thrive in hot acidic conditions.

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.