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Biological Classification Test - 96

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Biological Classification Test - 96
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Which of the following cannot be grown on artificial culture medium?
    Solution
    Unlike bacteria and other microorganisms which can be grown in artificial media, viruses cannot be grown on artificial media but must be grown in living cells. Viruses cannot be grown on an ordinary culture medium because they are not actually living organisms. Viruses can be cultivated within suitable hosts, such as a living cell. To study bacteriophages for example bacteria are grown in a suitable growth medium, then bacteriophages are added. Animal and plant viruses are cultivated in cell cultures. TMV is a virus so it can not be grown in culture medium. Escherichia coli, yeast and Aspergillus can be cultured in the medium. So the correct answer is 'TMV'.
  • Question 2
    1 / -0
    Match the column:
    List I
    		List II
    		List III
    A) Adsorption phase
    		i) Assemblage of virious
    		I) Complementary receptor sites
    B) Lytic phase
    		ii) Tail core is driven in through the bacterial cell wall.
    		II) Eclipse period
    C) Maturation phase
    		iii) Contact between phase
    		III) Lysozyme
    D) Penetration phase
    		iv) Cell wall dissolution
    		IV) Tail sheath

    Solution
    The first phase is the adsorption phase. This is the step where there is contact between the cell and the phage. This period involves binding of the phase to the complementary receptor sites.
    The lytic phase is the phase when there is destruction of the cell wall. The is the phase in which the phage releases lysozyme which destroys the cell wall.
    The maturation phase is the period when there is assembly of the virus particle staking place inside the host cells. This phase is also known as the eclipse phase. This phase makes the new particles ready to attack the other cells.
    The penetration phase is the period in which there is entry of the phage chromosome in the bacterial cell. The tail core attaches to the cell wall and allows the entry of the bacterial DNA. 
    Thus, the correct answer is option C. 
  • Question 3
    1 / -0
    Who was able to culture virus for the first time?
    Solution

  • Question 4
    1 / -0
    Boving spongiform encephalopathy disease is equal to
    Solution
    Bovine spongiform encephalopathy (BSE) or mad cow disease is a fatal disease that strikes the nervous system of cattle. Creutzfeldt–Jakob disease (CJD) is a universally fatal brain disorder in humans. BSE and CJD are part of the prion diseases. A prion is a type of protein that can trigger normal proteins in the brain to fold abnormally. Prion diseases can affect both humans and animals. BSE is the prion disease in animals and CJD is the prion disease in humans. So BSE is equal to CJD. So, the correct answer is 'Creutzfeldt-Jacob disease'.
  • Question 5
    1 / -0
    The sequence of spore production in Puccinia (wheat rust) is
    Solution
    Puccinia graminis is macrocyclic, producing all five spore stages: basidiospores, pycniospores (spermatia), aeciospores, urediniospores (uredospores), and teliospores. 
    Although stem rust is caused by a single species of fungus, 
    Puccinia graminis, there is considerable genetic variation within the species.
  • Question 6
    1 / -0
    Xanthomonas citri contains
    Solution
    Xanthomonas citri is a Gram-negative, rod-shaped proteobacteria. It is motile by means of a single polar flagellum. It mainly affects the citrus plants. It causes citri pathogenesis and citrus canker disease in citrus species like lime.
    Thus, the correct answer is 'Single polar flagellum.'
  • Question 7
    1 / -0
    Which one secretes pheromones for the function?
    Solution
    A pheromone is a chemical substance produced by one individual that causes behavioral changes in other organism when these are released in environment. it produces an effect on physiological, reproductive or external features. for example, Rhizopus has single sex but have two different mating types. When their adjacent halves secrete pheromones it triggers the hyphae to grow. Therefore option A "Rhizopus for formation of zygospores" is correct option
  • Question 8
    1 / -0
    Match the columns and find the correct answer
    Column IColumn II
    (a)Streptomyces(p)Food poisoning
    (b)Rhizobium(q)Source of antibiotic
    (c)Nitrosomonas(r)Nitrogen fixation
    (d)Acetobacter(s)Nitrification
    (t)Vinegar synthesis
    Solution
    Streptomcyes is a bacterium that is source of antibiotics like streptomycin, neomycin. These antibiotics are used in treatment of many bacterial infections. Rhizobium is a symbiotic nitrogen fixing bacteria. It fixes atmospheric nitrogen in association with the leguminous plants and make it available to the plants. Nitrosomonas is a bacterium that is involved in nitrification process. Nitrification is a process in which ammonia is converted into nitrite and nitrate is converted into nitrates. Nitrosomonas converts ammonia into nitrites. Acetobacter is an acetic acid bacteria which is involved in the vinegar synthesis. It converts alcohol into acetic acid.
    Thus, the correct answer is 'a-q, b-r, c-s, d-t.'
  • Question 9
    1 / -0
    Prions were studied by _______
  • Question 10
    1 / -0
    Select the correct matches.
    (a) Nitrosomonas - nitrite to nitrate
    (b) Thiobacillus - denitrification
    (c) Nostoc - free-living nitrogen fixer
    (d) Azotobacter - anaerobic nitrogen fixer
    Solution
    Nitrification is a process in which ammonia is converted to nitrites and nitrites into nitrates. Examples of nitrifying bacteria includes Nitrosomonas, Nitrosococcus, Nitrobacter, Nitrococcus. Nitrosomonas, Nitrosococcus converts ammonia to nitrites. Nitrobacter, Nitrococcus converts nitrites to nitrates. Denitrification is a process by which nitrate is reduced to molecular nitrogen. Examples of bacteria that carry out denitrification process includes Thiobacillus. Nitrogen fixation is a process by which atmospheric nitrogen is converted into ammonium compounds. Example of free living nitrogen fixer includes Nostoc. Example of free living aerobic nitrogen fixer includes Azotobacter. 
    Thus, the correct answer is 'b and c.'
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