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

Thermococcus, Methanococcus and Methanobacterium exemplify

  1. Bacteria whose DNA is relaxed or positively supercoiled but which has a cytoskeleton as well as mitochondria

  2. Bacteria that contain a cytoskeleton and ribosome

  3. Archaebacteria that contain proteins homologous to eukaryotic core histones

  4. Archaebacteria that lack any histones resembling those found in eukaryotes but whose DNA is negatively supercoiled
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Archaebacteria, including the genera mentioned, are known to possess histone-like proteins that help package their DNA, similar to eukaryotic histones.

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

Archaea differ from eubacteria in one of the following features

  1. They have a rigid wall

  2. Their cell wall lacks peptidoglycan component
  3. They have $16$ sRNA

  4. They are very ancient
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The primary difference between Archaea and Eubacteria is that Archaea cell walls do not contain peptidoglycan, which is a defining feature of Eubacteria.

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

Organisms called methanogens are most abundant in

  1. Polluted stream

  2. Cattle yard

  3. Sulphur rock

  4. Hot spring
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Methanogen belongs to Archaebacteria group. They are capable of producing methane gas or marshy gas or biogas. They produces methane gas in marshy areas. They are most abundant in marshy areas and cattle yard where cow sheds are present. The methange gas produces a peculiar odour in these areas.

Thus, the correct answer is 'Cattle yard.'

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

Archaebacteria live in harsh habitat like

  1. Extreme salty area

  2. Hot springs

  3. Marshy areas

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Archaebacteria are prokaryotes without true nucleus. They are of mainly 3 types, halophiles, thermophiles and methanogesn. They live in harsh habitat. Halophiles archaebacteria are found in extreme salty areas. Thermophiles are found in hot springs where temperature is extremely high. Methanogens are found in marshy areas and produce methange gas.

Thus, the correct answer is 'All of the above.'

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

Some hyperthermophilic organisms that grow in highly acidic $(pH _2)$ habitats belong to two groups

  1. Cyanobacteria and diatoms

  2. Protists and mosses

  3. Liverworts and yeasts

  4. Eubacteria and archaea
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • Many thermophiles are archaea, while thermophilic eubacteria are suggested to have been among the earliest bacteria.
  •  Many of these require elemental sulfur for growth. Some are anaerobes, that use the sulfur as an electron acceptor during cellular respiration. 
  • Some are lithotrophs, that oxidize sulfur to sulfuric acid, thus requiring the microorganism to be adapted to very low pH as well. These organisms are inhabitants of hot, sulfur-rich environments such as hot springs and geysers etc. Option D is correct.
Multiple choice botany the living world archaebacteria the three domains of life classification of microbes

A peculiar odour found in marshy areas and cow sheds is of gas produced by

  1. Archaebacteria

  2. Cyanobacteria

  3. Slime Moulds

  4. Mycoplasma
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Methanogen belongs to Archaebacteria group. They are capable of producing methane gas or marshy gas or biogas. They produces methane gas in marshy areas and cow sheds. This produces a peculiar odour.

Thus, the correct answer is 'Archaebacteria.'

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

The primitive prokaryotes responsible for the production of biogas from the drug of ruminant animals include

  1. Eubacteria

  2. Halophiles

  3. Thermoacidophiles

  4. Methanogens
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Methanogens belongs to Archaebacteria. They are primitive prokaryotes. They produce methane gas or biogas. They produce biogas or marshy gas from the drug of ruminant animals. They are found in marshy areas and digestive tract of ruminants.

Thus, the correct answer is 'Methanogens.'

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

Archaebacteria common in marshes and rice fields are

  1. Methanogens

  2. Halophiles

  3. Thermoacidophiles

  4. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Methanogens belongs to Archaebacteria. The other members of Archaebacteria includes halophiles and thermophiles. These are primitive prokaryotes. Methanogens produce methane gas or biogas. They produce biogas or marshy gas in marshy areas, rice fields and digestive tract of ruminants.

Thus, the correct answer is 'Methanogens.'

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

Which one among the following is likely to be present in the harsh conditions of the deep sea water?

  1. Saprophytic fungi

  2. Archaebacteria

  3. Eubacteria

  4. Blue-green algae
Reveal answer Fill a bubble to check yourself
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. 
So, the correct answer is Archaebacteria.
Multiple choice botany the living world archaebacteria the three domains of life classification of microbes

A few organisms are known to grow and at temperatures of $ 100-105^o C. $ They before ________________.

  1. Thermophilic sulphur bacteria

  2. Hot spring blue-green algae

  3. Thermophilic subaerial fungi

  4. Marine archaebacteria
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Thermophilic sulfur bacteria are extremophiles capable of surviving and growing in extremely high temperatures, such as those found in hot springs.