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Biological Classification Test - 17

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Biological Classification Test - 17
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  • Question 1
    1 / -0
    Find out the correct statement.
    Solution
    Outside living cells virus are non living particles, which cannot multiply. Virus multiply only within living cells, hence, they are obligate parasites.
  • Question 2
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    All viruses contain
    Solution
    Viruses are intracellular obligatory parasitic, self-replicating non-cellular, sub-microscopic organisms. They lack cellular organelles like ribosomes, mitochondria, etc. A simple virus particle, often called as a virion, consists of a nucleic acid core of genetic material, enclosed within a protein coat (capsid). The capsid consists of several identical protein subunits known as capsomeres. The amount of protein content differs in different types of viruses. 
    So, the correct answer is option A.

  • Question 3
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    The primary ventral cell give rises to
    Solution
    The correct answer is 'oosphere'
    The primary ventral cell in a fungus leads to formation of oosphere formed after fertilisation from oogonium.

  • Question 4
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    Which of the following exists in crystalline form?
    Solution
    The structure of the viruses can be crystallised in which molecules are arranged and oriented in a specific manner to form a crystal. Generally, the crystals are composed of the protein particles which have three-dimensional structure and can be used to study the structure and the symmetry of the viruses. X-ray crystallography can be used to study the structure.
    Thus, the correct answer is option C. 
  • Question 5
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    The protein coat of virus is called
    Solution
    The outer protein coat of a virus is known as the capsid. It consists of several oligomeric structural subunits made of a protein called protomers which cover the nucleic acid which is present in the virus and protects it when virus inserts itself into the host. The capsid proteins also help the virus attach and penetrate the host cells thereby infecting the host. Hence option A is correct.
  • Question 6
    1 / -0
    Which of the following can be made into crystal?
    Solution
    • The virus is non living infectious particle, hence, they can be crystallized. 
    • The tobacco mosaic virus was the first virus to be crystallized. It was achieved by W M Stanley in 1935 who also showed that TMV remains active even after crystallization. For his work, he was awarded Nobel Prize in Chemistry in 1946.
  • Question 7
    1 / -0
    A spore producing plant is ___.
    Solution
    Bread mould or Rhizopus is the most commonly found fungus. During asexual reproduction, inside the sporangium the mould makes spores, and the spores multiply inside it. When the sporangium breaks- open and all spores inside will float out. The spores land on a place where they can turn into a new mould, and begin to grow. 
    So, the correct answer is option B.
  • Question 8
    1 / -0
    The smallest disease causing agent is
    Solution
    A virus is a small infectious agent that replicates only inside the living cells of other organisms. Viruses can infect all types of life forms, from animals and plants to microorganisms, including bacteria and archaea. Virus is smaller than ants, lice or bacteria. 
    Therefore, the correct answer is option B.
  • Question 9
    1 / -0
    In the early years of discovery, viruses were referred to as 
    Solution
    In 1892, Dmitri Ivanowski showed that tobacco mosaic disease could be transmitted even after the Chamberland-Pasteur filter had removed all viable bacteria from the extract. After many years it was proved that these filterable infectious agents were not very small bacteria, but were a new type of tiny, disease-causing particle that later came to be known as virus.
     So, the correct answer is 'Filterable agents'
  • Question 10
    1 / -0
    A bacteriophage possesses an enzyme
    Solution
    A bacteriophage is a type of virus that infects bacteria. Bacteriophage genomes encode for lysozymes enzyme which plays the role in the lytic cycle. This enzyme helps in the release of virions by lysis of the host cells by digesting the host cell wall. Lysozyme also plays the role during infection where it bore a whole in host cellwall so that the bacteriopage can inject its genome into the host cytoplasm. Protease, urease and dehydrogenase are absent in bacteriophage. So, the correct answer is 'Lysozyme'.
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