Tag: classification of microbes

Questions Related to classification of microbes

Members of the archaebacteria

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

  1. May possess bacteriorhodopsin

  2. Possess branched chain lipids

  3. May possess high temperature tolerant enzymes

  4. May associated with body of eukaryotic organisms

Show answer
Correct Option: C
Explanation:

Enzymes synthesized by archaea (with optimal growth temperatures of >80 degree Celsius), also called hyperthermophilic enzymes, are typically thermostable ( that is resistant to irreversible inactivation at high temperatures) and are optically active at high temperatures. 

A few organisms are known to grow And multiply at a temperature of $100 - {105^ \circ }C$ they belong to

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

  1. Thermophilic sulphur bacteria

  2. hot spring blue green agae

  3. methanogenic archaebacteria

  4. Marine archaebacteria

Show answer
Correct Option: A
Explanation:

Thermophilic sulphur bacteria can survive at high temperatures between 41 and 122$^o$C and an optimum growth temperature which is higher than 75$^o$C. Hot spring blue-green algae have an optimum growth temperature of 45$^o$C. Methanogenic archaebacterium grows at an optimum temperature of 35-40$^o$C. Some marine archaebacteria are extreme thermophiles and grow at temperatures of 65- 80$^o$C. 

So, the correct answer is 'Thermophilic sulpher bacteria'.

Which of the following statement is not related to bacteria?

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

  1. They have polysomes for protein synthesis

  2. They have pill for genetic recombination

  3. They store food in the form of inclusion bodies

  4. They have plastid for antibiotic resistance

Show answer
Correct Option: A

Plasmids are found in

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

  1. Bacteria

  2. viruses

  3. Algae

  4. Fungi

Show answer
Correct Option: A
Explanation:

A plasmid is a small, circular piece of DNA that is different than the chromosomal DNA, which is all the genetic material found in an organism's chromosomes. It replicates independently of chromosomal DNA. Plasmids are mainly found in bacteria.

So, the correct option is 'Bacteria'.

What is true for Archaebacteria?

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

  1. All are halophiles

  2. All are photosynthetic

  3. All are fossils

  4. Oldest living organisms

Show answer
Correct Option: D
Explanation:

The archaebacteria are the primitive, single-celled, prokaryotic organisms. These are the ancient and oldest living organisms. These were the first organism which evolved on the Earth. These organisms have evolved to survive in the extreme conditions like the halophiles, thermophiles, acidophiles, methanogens, etc. 

Thus, the correct answer is option D. 

Archaebacteria which are seen at extremely high temperature and acidic pH are

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

  1. Methanogens

  2. Thermoacidophiles

  3. Halophiles

  4. Ruminant symbionts

Show answer
Correct Option: B
Explanation:
A thermoacidophile are the organisms which are adapted to survive at high temperatures and acidic pH. Thermoacidophiles generally prefer the temperature range of about 70 - 80 $^o$ C and pH between 2 and 3. They are found in the hot springs and thermal vents. 
Thus, the correct answer is option B. 

A few organisms are known to grow and multiply at temperatures of 100 ` $105^{0}$C. They belong to


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

  1. Thermophilic sub aerial fungi

  2. Marine archaebaderia

  3. Thermophilic sulphur bacteria

  4. Hot spring blue-green algae

Show answer
Correct Option: C
Explanation:

Thermophilic sulphur bacteria are found in hot springs and multiply at temperatutures 100-105$^0$C

So, the correct answer is 'Thermophilic sulphur bacteria

Which of the following represents obligate anaerobes.

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

  1. Spirogyra

  2. Pisum sativum

  3. Onion

  4. Methane bacteria

Show answer
Correct Option: D
Explanation:

The term Obligate anaerobes represent such microorganisms which can survive only in the absence of oxygen, i.e. presence of oxygen in their surrounding environment acts as a poison for them. Methane bacteria also called as methanogens are methane-producing bacteria which are obligate anaerobes as their metabolic processes do not require oxygen. Spirogyra are the green algae which produces oxygen. Pisum Sativum is commonly known as Green pea, which is a vegetable. Onion is also a vegetable.

 

The correct answer is D. 

Biogas is produced by

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

  1. Eubacteria

  2. Archaebacteria

  3. Mycoplasma

  4. Cyanobacteria

Show answer
Correct Option: B
Explanation:

Methanogens are responsible for methane gas production in biogas. Methanogen belongs to Archaebacteria class. Archeae are prokaryotic bacteria. They have no cell nucleus. They were initially classified as bacteria and hence called as Archaebacteria. 

Thus, the correct answer is 'Archaebacteria.'

Prokaryotes which can trap solar energy for ATP synthesis, but not for photosynthesis are

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

  1. Methanogens

  2. Thermoacidophiles

  3. Halophiles

  4. Cyanochloronta

Show answer
Correct Option: C
Explanation:

  • Halophiles are the prokaryotes that can be aerobic or anaerobic. 
  • The phototropic anaerobic halophiles can trap solar energy for the synthesis of ATP i.e Adenosine Triphosphate with the help of ATP synthase enzyme. ATP is also known as the energy currency of a cell.
  • The correct answer is C.