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Biomolecules Test - 48

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Biomolecules Test - 48
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  • Question 1
    1 / -0
    One mole of stachyose on hydrolysis yields:
    Solution
    Stachyose is an oligosaccharide.

    Stachyose is a tetrasaccharide consisting of two α-D-galactose units, one α-D-glucose unit, and one β-D-fructose unit 

    One mole of stachyose on hydrolysis yields one mole of glucose, one mole of fructose and two moles of galactose.

    Option A is correct.
  • Question 2
    1 / -0
    The enzymes are substances which
    Solution
    Enzymes are macromolecular biological catalysts. Enzymes accelerate, or catalyze, chemical reactions. The molecules at the beginning of the process are called substrates and the enzyme converts these into different molecules, called products. Almost all metabolic processes in the cell need enzymes in order to occur at rates fast enough to sustain life. Digestive enzymes are enzymes that break down polymeric macromolecules into their smaller building blocks. Enzymes are proteins. So, they made of amino acids. They are not broken into simpler substances during digestion. They themselves can not undergo dissociation reactions. 
    Therefore, the correct answer is option C.
  • Question 3
    1 / -0
    Apoenzyme is a
    Solution
    Correct option: A
    Explanation:

    • Apoenzyme is the protein part of a holoenzyme, which is rendered inactive when separated from its cofactor or prosthetic group.
    • Thus, apoenzyme and cofactor/prosthetic group together make an active holoenzyme.
    • The cofactor of the holoenzyme is a non-protein part and is responsible for the activity of the enzyme.
  • Question 4
    1 / -0
    Which of the following is correct?
    Solution
    The only role of catalyst in a chemical reaction will be to increase the rate of reaction and there will be no chemical change in catalyst. Starch solution is a hydrosol. Size of solute in true solution will be less than $${10}^{-8}$$ Both the catalyst (mineral acid) and reactants phase are in liquid state are of same phase. this reaction is an example of homogenous catalysis reaction.
  • Question 5
    1 / -0
    The enzymes that catalyse endergonic synthesis, coupled with exergonic hydrolysis of ATP are
    Solution
    There are six major classes of enzymes, as follows:

    (1) Oxidoreductases- Catalyze oxidation reduction reactions.
    (2) Transferases- Catalyze the transfer of a functional group from a donor molecule to an acceptor molecule.
    (3) Hydrolases- Catalyze hydrolysis reactions. 
    (4) Isomerases- Catalyze conversion of a molecule from one isomeric form to another.
    (5) Ligases- Ligases or synthetases are enzymes that catalyse endergonic synthesis, coupled with the exergonic hydrolysis of ATP.
    (6) Lyases- Catalyze certain reactions in which double bonds form or break.

    So, the correct answer is option A.
  • Question 6
    1 / -0
    Which one is true for ATP?
    Solution
    Adenosine triphosphate, also known as molecular unit of currency, is a coenzyme of vast importance in the transfer of chemical energy derived from biochemical oxidations and it also transports energy within cells for metabolism. Thus, option D is the right answer.
  • Question 7
    1 / -0
    Bile salts act as an activator of which enzyme?
    Solution
    Bile salts act as activator of lipase as they emulsify fat globules into smaller droplet like structure called micelles thereby, increasing the surface area accessible to lipid hydrolyzing enzymes. The bile acids also help to solubilize lipid breakdown products. Thus, the correct answer is option C.
  • Question 8
    1 / -0
    The general molecular formula for disaccharide is:
    Solution
    A disaccharide is a sugar (a carbohydrate) composed of two monosaccharides. It is formed when two sugars are joined together and a molecule of water is removed.
    $$C_{12}H_{22}O_{11}$$ is sucrose on hydrolysis gives
    $$C_{ 12 }H_{ 22 }O_{11}+H_2O\longrightarrow C_6H_{12}O_6+C_6H_{12}O_6$$ gives glucose and fructose.
    All others cannot hydrolyse in water making them monosaccharides.
  • Question 9
    1 / -0
    Glucose on oxidation gives the acid containing the C-chiral atoms equal to:
    Solution
    Glucose on oxidation gives gluconic acid.
    It consists of four chiral carbon atoms.

  • Question 10
    1 / -0
    The study of the energy transfer and relationships between all living organisms is known as
    Solution
    Thermodynamics is the quantitative study of the energy transductions that occur in and between living organisms, structures and cells and of the nature and function of the chemical processes underlying these transductions. 
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