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Biological Classification Test - 50

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Biological Classification Test - 50
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Weekly Quiz Competition
  • Question 1
    1 / -0
    LPP-1 is a
    Solution
    The virus which infects the cyanobacteria is known as cyanophage. The LPP-1 was the first cyanophage which was discovered in 1963. Lyngbya, Plectonema and Phormidium are the three genera of virus which was affected by the cyanophage and so the virus was named as LPP-1.
    So, the correct answer is option D.
  • Question 2
    1 / -0
    Name the virus which was crystallised for the first time.
    Solution
    Tobacco mosaic virus is a positive sense single stranded RNA virus that infects tobacco and other members of the family Solanaceae. Tobacco mosaic virus was the first virus to be crystallized. It was done by Wendell Meredith Stanley in 1935. He also showed that TMV remains active even after crystallization. For his work, he was awarded the Nobel Prize in Chemistry in 1946. So, the correct answer is 'TMV'.
  • Question 3
    1 / -0
    Bacteriophage $${T}_{2}$$ is
    Solution
    The arrangement of capsomere unit in the viral capsid determines the symmetry of the bacteriophage. Binal symmetry is a symmetry which is used for the bacteriophages having complex symmetry having icosahedral head and helical tail. Virus with a head having 12 vertices (corner), 20 facet (sides) and 30 edges is known as icosahedral. For example, T$$_2$$ bacteriophage.
    So, the correct answer is 'Bacteriophage T$$_2$$'.

  • Question 4
    1 / -0
    Who cultured the virus for the first time?
    Solution
    Virus lacks metabolism of its own and due to this reason they cannot multiply without infecting a living cell. Due to this reason viruses could not be cultured in a laboratory. In 1941 John Enders, Frederick Robbins and Thomas Weller succeeded in culturing the virus that causes polio in human muscle and tissue in a laboratory setting. This became a key step for making vaccine against polio. So, the correct answer is 'Enders'.
  • Question 5
    1 / -0
    Tailed bacteriophage is
    Solution
    • Tailed bacteriophages are non-motile. They have a common origin and constitute family Caudovirales. 
    • Their structured tail is unique. Tailed phages share a series of high-level taxonomic properties and show many facultative features that are unique or rare in viruses e.g., lambda, Mu, and P1 phage.
      So option A is correct.
  • Question 6
    1 / -0
    Largest known RNA virus is
    Solution
    Citrus tristeza virus (CTV) is a virus that causes the most economically damaging disease to Citrus. CTV is phloem-limited and the largest of the known plant viruses. CTV is a flexuous rod virus with dimensions of 2000 nm long and 12 nm in diameter. The CTV genome is 19.3 kb long and consists of a single strand of positive sense RNA enclosed by capsid proteins. The size of its genome makes CTV one of the largest RNA viruses known. 
    So, the correct answer is 'Citrus tristeza'.
  • Question 7
    1 / -0
    The stage following infection by virus when virus particles cannot be observed is
    Solution
    Eclipse period is the time between infection by a bacteriophage or other virus and the appearance of the mature virus within the cell. During eclipse period the virus is disassembled and the component parts are being synthesized and progeny virus is being assembled. So the correct answer is 'eclipse phase'.
  • Question 8
    1 / -0
    Virus attacking blue-green algae is known as
    Solution
    • A cyanophage is a virus that infects cyanobacteria - blue-green algae. 
    • The name is constructed from the term phage, for a virus that targets bacteria, and cyanobacteria for the specific type of bacteria this virus uses for replication.
    Hence the correct option is A.
  • Question 9
    1 / -0
    Viruses cannot multiply of their own because they
    Solution
    A virus is a small parasite that cannot reproduce by itself. Viruses are made of genetic material and protein coat. They do not have cellular machinery required for viral multiplication. Once it infects a susceptible cell, the virus can direct the host cell machinery to produce the viral genome and viral proteins to make new capsids. Next, the viral particles are assembled into new viruses. These new viruses burst out of the host cell by lysis which kills the host cell. So, the correct answer is 'Lack of cellular machinery to use its genetic material'.
  • Question 10
    1 / -0
    T-bacteriophages possess
    Solution
    The T bacteriophage is tadpole shaped with a head and tail. It consists of the five important sub units such as the head, collar, neck, tail base plate and fibres. This viral particle is naked, icosahedral and tailed. A dsDNA molecule is tightly packed inside the head. The DNA is 1,000 times longer than the phage itself which greatly remained folded. This DNA codes for more than 75 genes. So, the correct answer is 'Tadpole shape'.
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