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Chemistry in Everyday Life Test - 5

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Chemistry in Everyday Life Test - 5
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  • Question 1
    1 / -0

    Which of the following statements is incorrect?

    Solution

    Antioxidants are regarded as sacrificial compounds, which themselves being more reactive towards oxygen prevent the oxidation of the preserved substance.
    BHA and BHT are phenolic compounds used as antioxidants for the packaged foods as oxygen reacts preferentially with them rather than with the fat in the food.

    They are more effective when used with ascorbic acid as it produces a synergic effect.

     

  • Question 2
    1 / -0

    Why is cetyltrimethylammonium bromide referred to as invert soap?

    Solution

    [CH3(CH2)15N+(CH3)3]Br-
    Cetyltrimethylammonium bromide is a cationic detergent and the cleansing action is due to the cationic part of the molecule. Hence, it is called an invert soap.

     

  • Question 3
    1 / -0

    Detergents having unbranched side chains are preferred because

    Solution

    The detergents having unbranched hydrocarbon side chain are preferred because they are biodegradable. This is because the unbranched side chain is more prone to attack by bacteria.

     

  • Question 4
    1 / -0

    Which of the following statements is correct?

    Solution

    Statement 1 is correct but rest of the statements are incorrect as explained below:
    Statement - 2 : Substrate molecules bind to the active sites of the enzyme through a variety of interactions like hydrogen bonding, dipole-dipole interactions, Vander Waal's forces of attraction, etc. but not a covalent bond.
    Statement - 3 : In the competitive inhibition, drugs bind to the active site of the enzyme.
    Statement - 4 : Non-competitive inhibitor binds to the allosteric site of the enzyme.

     

  • Question 5
    1 / -0

    Choose the correct pair from among the following.

    Solution

    Hormones - secretions of endocrine glands
    Neurotransmitters - communicate messages between two neurons and those between neurons and muscles
    Antagonists - bind to the receptor site and inhibit its natural functioning
    Agonists - mimic the natural messenger

     

  • Question 6
    1 / -0

    The drug that blocks the action of an enzyme by binding at the active site of the substrate is a

    Solution

    The drug that competes with the enzyme by binding at the active site of the substrate is a competitive inhibitor.

     

  • Question 7
    1 / -0

    Which statement about p-Hydroxybenzoate esters is incorrect?

    Solution

    p-Hydroxybenzoate esters are less effective on bacteria.

     

  • Question 8
    1 / -0

    Which of the following dyes is acidic in nature and is a derivative of sulphanilic acid?

    Solution

    Orange - I is a derivative of sulphanilic acid and is acidic in nature.

     

  • Question 9
    1 / -0

    Which of the following drugs is likely to cause ulcer in the stomach?

    Solution

    Aspirin are not advised to be taken on an empty stomach because it gets hydrolysed to salicylic acid, which can cause hyper acidity and may result in ulcer in extreme cases.

     

  • Question 10
    1 / -0

    Which of the following statements are incorrect about the receptor proteins?

    A. The shape of receptor does not change during attachment of messenger.
    B. Chemical messengers are received at the binding sites of receptor proteins.
    C. The active site of receptor proteins opens on the inside region of the cell.
    D. Majority of receptor proteins are embedded in the cell membranes.

    Solution

    Statements A and C are incorrect as explained below:

    Statement A: Chemical messengers are received at the binding sites of the receptor proteins.In order to accommodate the messenger, the shape of the receptor site changes.
    Statement C: Receptor proteins are embedded in the cell membrane in such a way that a small part possessing the active site projects out of the surface of the membrane and opens on the outside region of the cell membrane.

     

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