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Biological Classification Test - 53

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Biological Classification Test - 53
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Extra nuclear DNA in E. coli is termed as
    Solution
    F factor is an extra nuclear DNA found in E. coli. It is also called as fertility factor. It is used to transfer genes from one bacterium to another bacterium by conjugation. F factor in E. coli is also called as sex factor. Episome is also called as plasmid. It is an extra nuclear DNA found in many bacteria. It gives selective advantage to bacteria carrying it. For example, it contains antibiotic resistant genes.
    Thus, the correct answer is 'All of above.'
  • Question 2
    1 / -0
    Nucleic acid does not occur in
    Solution
    Prions are misfolded proteins which cause several fatal neurodegenerative diseases in animals and humans. In humans, prions cause Creutzfeldt Jakob disease (CJD) and in cattle, it causes mad cow disease. Prions are only proteins and do not include nucleic acids. Viroid is composed of single-stranded RNA without a protein coat. Mycoplasma is a bacterium with DNA. Viruses are small infectious particles made of nucleic acids and a protein coat. So, the correct answer is 'Prion'.
  • Question 3
    1 / -0
    Photosynthetic protists belong to
    Solution

    The photosynthetic protest is plant-like protists which are capable of preparing their own food by the process of photosynthesis. They belong to class BAcillareophyceae (or diatoms), Euglenophyceae (euglenids or excavate) and dinophyceae (i.e. dinoflagellates).

    The correct answer is C.

  • Question 4
    1 / -0
    Which of the following affect proteins and nucleic acids but not viruses?
    Solution
    It affects protein on denaturation and nuclease enzymes affect nucleic acid and pressure will be affect the composition but not the viruses. They are resistant to all.
    So, the correct option is option D.
  • Question 5
    1 / -0
    Marsh gas is produced by
    Solution
    Marsh gas is also called as biogas. It is also called as methane gas as it primarily consists of methane gas along with hydrogen sulfide and carbon dioxide in minor composition. It is a produced by the decomposition of vegetable matter under water by anaerobic bacteria. The marsh gas is produced by Methanogens that are found in marshes.
    Thus, the correct answer is 'Methanogens.'
  • Question 6
    1 / -0
    Identify the option, which is not a common characteristic for bacteria and yeast.
    Solution
    Bacteria and yeast are unicellular organisms. Both are made up of only one cell. However, bacteria are prokaryotes and yeast are eukaryotes. Bacteria do not contain membrane bound organelles and nucleus. However, yeast contains membrane bound organelles and have true nucleus. Under anaerobic condition, yeast causes fermentation and converts sugar into alcohol. Lactic acid bacteria causes fermentation and produces lactic acid from milk. Both yeast and bacteria are capable of producing spores under unfavourable condition.
    Thus, the correct answer is 'Both are prokaryotes.'
  • Question 7
    1 / -0
    Escherichia coli is a bacterium which is common inhabitant of
    Solution
    Escherichia coli are Gram-negative, facultative aerobic bacteria. They are common inhabitant of human intestines. These strains of E. coli are harmless. They form the part of the normal microbiota of the intestine. They live in symbiotic association. They benefit hosts by producing vitamin K$$_2$$ and preventing colonization of the intestine with pathogenic bacteria.
    Thus, the correct answer is 'Human intestine.'
  • Question 8
    1 / -0
    Chemosynthetic bacteria do not need sunlight to grow because
    Solution
    Chemosynthetic bacteria do not need sunlight to grow because they prepare their food without the help of light. They use inorganic molecules as a source of energy and convert into organic substances. They obtain energy from oxidation of organic substances. 
    Thus, the correct answer is 'They prepare their food without the help of light.'
  • Question 9
    1 / -0
    For production of methane, methanogens
    Solution
    Methanogens are microorganisms that produce methane in absence of oxygen by the process called as methanogenesis. They belong to the kingdom Monera and the domain archaea. They use inorganic material as the source of energy such as hydrogen sulfide, elemental sulfur, ferrous iron, ammonia. They reduce carbon dioxide to methane and use hydrogen gas as an electron-donating reductant.
    Thus, the correct answer is 'Reduce carbon dioxide.'
  • Question 10
    1 / -0
    A cell wall material present only in blue green algae and bacteria is
    Solution
    There are many similarities between cyanobacterium and bacterium. They both posses saparophytic mode of life. They both lack true cell organelles. They both posses nucleoid instead of true nucleus. In both bacteria and blue green algae, the cell wall is made up of muramic acid and diaminopimelic acid.
    Thus, the correct answer is 'Muramic acid.'
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