Tag: classification of microbes

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

Members of the archaebacteria

  1. May possess bacteriorhodopsin

  2. Possess branched chain lipids

  3. May possess high temperature tolerant enzymes

  4. May associated with body of eukaryotic organisms
Reveal answer Fill a bubble to check yourself
C Correct answer
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. 

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

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

  1. Thermophilic sulphur bacteria

  2. hot spring blue green agae

  3. methanogenic archaebacteria

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

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

Which of the following statement is not related to bacteria?

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Bacteria are prokaryotes and do not possess membrane-bound organelles like plastids. Antibiotic resistance in bacteria is typically conferred by plasmids, not plastids, which are found in plants and algae.

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

Plasmids are found in

  1. Bacteria

  2. viruses

  3. Algae

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

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

What is true for Archaebacteria?

  1. All are halophiles

  2. All are photosynthetic

  3. All are fossils

  4. Oldest living organisms
Reveal answer Fill a bubble to check yourself
D Correct answer
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. 

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

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

  1. Methanogens

  2. Thermoacidophiles

  3. Halophiles

  4. Ruminant symbionts
Reveal answer Fill a bubble to check yourself
B Correct answer
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. 
Multiple choice botany the living world archaebacteria the three domains of life classification of microbes

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


  1. Thermophilic sub aerial fungi

  2. Marine archaebaderia

  3. Thermophilic sulphur bacteria

  4. Hot spring blue-green algae
Reveal answer Fill a bubble to check yourself
C Correct answer
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

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

Which of the following represents obligate anaerobes.

  1. Spirogyra

  2. Pisum sativum

  3. Onion

  4. Methane bacteria
Reveal answer Fill a bubble to check yourself
D Correct answer
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. 

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

Biogas is produced by

  1. Eubacteria

  2. Archaebacteria

  3. Mycoplasma

  4. Cyanobacteria
Reveal answer Fill a bubble to check yourself
B Correct answer
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.'

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

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

  1. Methanogens

  2. Thermoacidophiles

  3. Halophiles

  4. Cyanochloronta
Reveal answer Fill a bubble to check yourself
C Correct answer
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.