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Biological Classification Test - 61

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Biological Classification Test - 61
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Murein does not occur in the wall of
    Solution
    Bacteria, Eubacteria and Nostoc (Blue green algae) are prokaryotic organisms. They lack true cell organelles. They posses nucleoid instead of a true nucleus. Nucleoid is a genetic material without a nuclear envelope. The cell wall is made up of peptidoglycan. Peptidoglycan is a polymer made up of sugars and amino acids. It is also called as murein. 
    Thus, the correct answer is 'Diatoms.'
  • Question 2
    1 / -0
    Amphitrichous flagellation has
    Solution
    There are four types of flagellar arrangements based on the number and placement of flagella on the cell. These are, 
    1. Monotrichous - A single flagellum extends from one end of the cell.
    2. Amphitrichous - A single flagellum or multiple flagella extend from two ends of the cell.
    3. Lophotrichous - Tuft of flagella extend from one end or both ends of the cell.
    4.  Peritrichous - Multiple flagella randomly distributed all over the body of the bacterial cell.
    Thus, the correct answer is 'Flagella at both the ends.'

  • Question 3
    1 / -0
    Bacteria connected with acetogenesis is
    Solution
    Acetogenesis is a process by which acetate is produced from carbon dioxide by anaerobic bacteria using reductive acetyl-CoA. The electron source used is hydrogen, CO, formate, etc. The bacteria that are capable of acetogenesis are called as acetogens. Examples include Citromonas, Acetobacter, Syntrobacter.
    Thus, the correct answer is 'Citromonas.'
  • Question 4
    1 / -0
    Bacteria with group of flagella on both sides are
    Solution
    There are four types of flagellar arrangements based on the number and placement of flagella on the cell. These are, 
    1. Monotrichous - A single flagellum extends from one end of the bacterial cell.
    2. Amphitrichous - A single flagellum or multiple flagella extend from two ends of the cell.
    3. Lophotrichous - Tuft of flagella extend from one end or both ends of the cell.
    4.  Peritrichous - Multiple flagella randomly distributed over the entire bacterial cell.
    Thus, the correct answer is 'Amphitrichous.'

  • Question 5
    1 / -0
    Marine protozoans lack contractile vacuole because
    Solution

    The marine protozoa do not have contractile vacuole because the marine protozoa live in a hypertonic environment and are hypo-osmotic to their environment. So, they do not need to store and remove excess water as in the case of freshwater protozoa.

    The main function of contractile vacuole is to store and remove the excess water present in the cell. Marine protozoa do not need to remove excess water out of the cell, instead, they need to conserve water from getting lost in the hypertonic environment. Hence, they do not need contractile vacuole.

    So, the correct answer is 'They are hypo-osmotic to their environment.'

  • Question 6
    1 / -0
    People recovering from long illness are often advised to take Spirulina, because it
    Solution
    Spirulina is a blue-green algae. It is rich source of proteins. It is widely consumed by humans and animals. It contains 57 grams of protein per 100 grams. It contains all the essential amino acids. Hence, people recovering from long illness are often advised to take Spirulina.
    Thus, the correct answer is 'Is rich in proteins.'
  • Question 7
    1 / -0
    Which structures are found in mycoplasmas, spirochaetes and rickettsias?
    Solution
    Prokaryotes are unicellular organisms without membrane-bound organelles. They do not contain nuclear envelope. They contain nucleoid, genetic material without nuclear envelope. The genetic material present in them is DNA and RNA without proteins. They also contains ribosomes in the cytoplasm. Examples include bacteria like Mycoplasma, Rickettsias and Spirochaetes.
    Thus, the correct answer is 'All the above.'
  • Question 8
    1 / -0
    Milk bacterium is
    Solution
    Lactobacillus is also called as milk bacterium. It produces enzyme lactase. This lactase converts the protein lactose present in the milk into lactic acid. This results in the cuddling of the milk. Hence, this bacterium is used to produced curd and other milk products by the process of fermentation.
    Thus, the correct answer is 'Lactobacillus.'
  • Question 9
    1 / -0
    Membrane bound organelles are absent in
    Solution
    Correct answer: A
    Explanation: 
    • Prokaryotes do not have membrane-bound organelles.
    • $$\textit{Streptococcus}$$ is a single-celled prokaryotic organism that belongs to the Monera Kingdom.
    Hence, $$\textit{Streptococcus}$$ does not have membrane-bound organelles. 

  • Question 10
    1 / -0
    Which one is correct pairing
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