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Biological Classification Test - 52

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Biological Classification Test - 52
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  • Question 1
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    What of the following is true of the virus?
    Solution
    Viruses are called as an obligate intracellular parasite because they are non-living outside the host cell. They can live only inside the host cell. They are unable to perform life process outside the living cells. They use the metabolic machinery of the host cell to replicate. So the viruses are called as intracellular obligate parasites. Viruses are smaller than bacteria and contain either DNA or RNA. Viruses are very specific to their host. 
    So, the correct answer is 'They are obligate intracellular parasites'.
  • Question 2
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    What is true about viruses?
    Solution
    Crystallization is referred to the process of transforming viral components into organized solid particles. It is used to study the structural characteristics of viral components by using X-Ray crystallography technique. These crystallized viruses can be stored for several years. In 1935, tobacco mosaic virus became the first virus to be crystallized. So, the correct answer is 'They can be crystallised and stored for several years'.
  • Question 3
    1 / -0
    The agents which are known to cause CJD are
    Solution
    Creutzfeldt Jakob disease (CJD) is a rare, degenerative fatal brain disorder. CJD is caused by a protein known as a prion. Infectious prions are misfolded proteins that can cause normally folded proteins to become misfolded. Prions cause the progressive death of the brain's nerve cells which is associated with the build-up of abnormal prion protein molecules forming amyloids that cause brain damage and death. So, the correct answer is 'Protein particles'.
  • Question 4
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    A polyhedral virus is
    Solution
    A virus can be classified into icosahedral, enveloped and complex or helical based on the structure of a virus. Polyhedral viruses consist of nucleic acid surrounded by a polyhedral or many-sided shell or capsid and usually in the form of an icosahedron. Adenovirus is an example of a polyhedral virus. Adenoviruses are nonenveloped viruses with an icosahedral nucleocapsid which surrounds the double-stranded DNA genome.  
    So, the correct answer is 'Adenovirus'.
  • Question 5
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    Which of the following are neither prokaryotes nor eukaryotes?
    Solution
    Eukaryotic cells contain membrane bound organelles and includes a nucleus. Eukaryotes can be single celled or multicellular  such as plants, fungi and monera etc. Bacteria are an example of prokaryotes. Prokaryotic cells do not contain a nucleus or any other membrane bound organelle. Viruses are neither prokaryotes nor eukaryotes because they lack the characteristics of living things except the ability to replicate which they accomplish only in living cells. Bacteriophages are viruses so they are neither prokaryotes nor eukaryotes. So the correct answer is 'bacteriophages'.
  • Question 6
    1 / -0
    Enzymes are not found in
    Solution
    A virus is a small infectious agent that replicates only inside the living cells of other organisms. Virus is made of the genetic material which is either DNA or RNA that carry genetic information, a protein coat called the capsid which surrounds and protects the genetic material and an envelope of lipids that surrounds the protein coat. Viruses do not contain enzymes or any other metabolic machinery so they use host machinery after infection. So, the viruses are called as intracellular obligate parasites. 
    So, the correct answer is 'Virus'.
  • Question 7
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    Bacteria cannot survive in a highly salted pickle because
    Solution
    Bacteria cannot survive in a highly salted pickle. When bacteria are added to hypertonic medium like the salted pickle, water moves from hypotonic media, bacterial cell to hypertonic media, pickle. Due to plasmolysis, the bacterial cell will shrink and consequently die.
    Thus, the correct answer is 'They become plasmolysed and consequently die.'
  • Question 8
    1 / -0
    Which statement is wrong about viruses?
    Solution
    • Viruses are the microorganisms which inject a living host and remain as an intercellular parasite. 
    • They inject their genetic material which replicates using host cell machinery and reforms their structure and attains viable structure capable enough to affect other cells. 
    • They have the ability to synthesize nucleic acids by replication. Antibiotics do not act against the virus as they are made up of polymorphic protein coat. 
    • Viruses have a different type of symmetry like icosahedral and helical. So, the correct answer is option B.
  • Question 9
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    Viruses were seen under the microscope for the first time by
    Solution

  • Question 10
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    Which of the following is true about prions?
    Solution
    • A prion is a small protein (smaller than viruses) that can trigger normal proteins in the brain to fold abnormally and accumulation of these abnormal proteins can lead to various diseases.
    • Prions usually have low molecular weight.

    So, the correct answer is option D.
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