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Biomolecules Test - 17

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Biomolecules Test - 17
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  • Question 1
    1 / -0
    The most abundant compound in living cells is
    Solution
    Water is the most abundant compound in the living cell. The total amount of water present in the human body is 80% out of which 65-70% is present in the living cells. It supports the metabolic reactions in the body. The salts like sodium and potassium dissolve in the water help to maintain the potential gradient across the membrane and helps in the active transport of solutes inside the cell. It also helps to maintain homeostasis and regulate the temperature of the body.
    So, the correct answer is option B.
  • Question 2
    1 / -0
    Enzymes concerned with transfer of electrons are
    Solution
    Dehydrogenases catalyze dehydrogenation reactions, which involve addition or removal of electrons. Addition or removal of electrons will lead to reduction or oxidation of substrates. Dehydrogenases are a type of oxidoreductases.
  • Question 3
    1 / -0
    Esterase enzyme belongs to which of the following class?
    Solution
    Esterases are the enzyme which hydrolyse ester linkage. Hence, esterases belong to class Hydrolase. Hydrolases are the enzymes catalysing hydrolysis.
  • Question 4
    1 / -0
    The effectiveness of an enzyme is affected least by
    Solution
    Enzyme activity is dependent on temperature, concentration of enzyme and concentration of substrates, pH etc. However the effectiveness of an enzyme is least affected by the original activation energy of the system. In other words enzymes cannot alter feasibility of a reaction but can alter only rate of a reaction. The enzyme cannot make feasible an infeasible reaction. Feasibility of a reaction is dependent on original activation energy of the system.
  • Question 5
    1 / -0
    Which one is not an example for hydrolases?
    Solution
    • Dehydrogenases catalyze dehydrogenation reactions which involve the addition or removal of electrons. The addition or removal of electrons will lead to the reduction or oxidation of substrates. Dehydrogenases are a type of oxidoreductase. 
    • Hydrolases are enzymes that catalyze the cleavage of a covalent bond using water. Some of the important hydrolases include amylases, sucrase, lactase, maltase, protease, esterase, etc.

    So, the correct answer is option A.
  • Question 6
    1 / -0
    Which one of the following is body building material?
    Solution

    Proteins are building blocks of life. Sugar (meaning carbohydrate) is required for energy. Mineral salts can be used for various functions like building strong bones, etc. Fats are also required for energy. Fats can be stored in the body and can be used when carbohydrates are exhausted.

  • Question 7
    1 / -0
    Lactic dehydrogenase (LDH) which catalyzes pyruvate to lactate is an example of
    Solution
    Some enzymes have several molecular forms, example: 16 for $$\alpha$$-amylase and 5 for lactate dehydrogenase (LDH). They are called as isoenzymes or isozymes. They differ in substrate affinity, maximum activity and regulatory properties.
  • Question 8
    1 / -0
    The plant proteinases or endopeptidases enzyme is
    Solution
    • Papain is the only protein that is not found in humans. It is found in plants like papaya and the main function of papain is breakdown of peptide bonds in protein.
  • Question 9
    1 / -0
    Which one of the following pair is wrongly matched?
    Solution
    This question relates to the industrial applications of enzymes. Alcohol is not produced by the use of nitrogenase. Nitrogenase performs complex functions of nitrogen fixation by bacteria. Alcohol is produced by the fermentation process of sugars carried out by Yeast.
  • Question 10
    1 / -0
    At temperature just below the freezing point, the enzyme is
    Solution
    Enzymes are biological catalysts, which are active in a narrow range of temperature and pH. At extremes of temperature or pH, enzymes are not active. At near freezing temperature, enzymes are inactive.
    So, the correct answer is 'Inactivated'
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