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Biomolecules Test - 22

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Biomolecules Test - 22
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  • Question 1
    1 / -0
    A non-proteinaceous enzyme is
    Solution
    (A) Correct option (D)
    (B) Explanation of correct answer:
    • Ribozymes are RNA molecules that catalyze or autocatalyze sequence-specific cleavage. 
    • They are found in viruses, plants, and mammals and operate as RNA cutting enzymes. 
    • Ligases, deoxyribonucleases, lysozymes are proteinaceous enzymes i.e., made up of proteins while ribozymes has RNA as structural components.
    • Enzymes are highly efficient catalytic macromolecules with variable activity.
    So, option (D) is the correct answer.
  • Question 2
    1 / -0
    Which of the following describes the given graph correctly?

    Solution
    Any chemical reaction includes formation of transition state between reactant and product. Formation of transition state requires high energy content of reactant molecules for alignment of reacting groups, formation of transient unstable charges, rearrangements of chemical bonds etc. The energy required for formation of transition state is termed as activation energy. Enzymes enhance the rate of reaction by lowering down the activation energy of transition state.  In given graph, energy of substrate is higher than that of product reflecting the endothermic nature of reaction. And B is the activation energy in absence of enzyme which is lowered down to A in presence of enzyme. 
    Therefore, the correct answer is option C.
  • Question 3
    1 / -0
    Sucrose on hydrolysis gives
    Solution

    The structure of sucrose as shown:

    These two monosaccharides are held together by a glycosidic linkage between C1 of α-D-glucose and C2 of β-D-fructose

    Sucrose(Hydrolysis)H2O+αDGlucose+βDFructoseSucrose \xrightarrow[(Hydrolysis)]{H_2O^+} \alpha-D-Glucose + \beta-D-Fructose

    Option B is correct.

  • Question 4
    1 / -0
    Which one of the following statements is correct, with reference to enzymes?
    Solution
    A) Correct option is (C)
    B) Explanation for correct option (C)

    Holoenzyme is the active form of the enzyme. It is made of 2 components called the apoenzyme and coenzyme. A cofactor can also be called a coenzyme if it is an organic molecule. The apoprotein itself is inactive. On binding with the cofactor, it gets activated resulting in the formation of a holoenzyme that is functional. 

  • Question 5
    1 / -0
    Starch is a mixture of two components, a water soluble component amylose(15-20%) and a water insoluble component amylopectin (80-85%). The aqueous solution of amylose gives a blue colour with iodine solution due to the formation of:
    Solution
    Inclusion complex is a host-guest addition compound.

    The space available within the crystal lattice of the host molecule, i.e., amylose is in the form of tunnels and the size of the tunnels is such that it can easily accommodate guest molecules, i.e., iodine molecules to form an addition compound called the inclusion complex.

    The blue colour, however, disappears on heating and reappears on cooling.

    Option C is correct.
  • Question 6
    1 / -0
    Which of the following does not represent a disaccharide? 
    Solution
    Dextrose (glucose) is a monosaccharide. It  does not represent a disaccharide.
  • Question 7
    1 / -0
    The metal present in vitamin B12{B}_{12} is:
    Solution
    Cobalt is present in vitamin B12{B}_{12}

    Vitamin B12 \displaystyle B_{12} is present in egg, curd, fish, liver of pig,sheep etc. It's deficiency causes degradation of spinal cord, anaemia etc.

    Option B is correct.
  • Question 8
    1 / -0
    The chemical name of vitamin C is:

    Solution
    The chemical name of vitamin CC is ascorbic acid. The name, ascorbic acid, is derived from a (meaning no) and scorbutus (scurvy), the disease caused by a deficiency of vitamin C. The body requires ascorbic acid in order to form and maintain bones, blood vessels, and skin.
  • Question 9
    1 / -0
    The term hormone was first introduced by

    Solution
    The term hormone was first introduced by Baylers and Starling. Hormones are your body's chemical messengers. They travel in your bloodstream to tissues or organs. They work slowly, over time, and affect many different processes, including growth and development, metabolism - how your body gets energy from the foods you eat, sexual function, reproduction, mood.
  • Question 10
    1 / -0
    Vitamin A is known as:
    Solution
    Vitamin AA is also known as retinol. 

    Vitamin A is important for proper development and functioning of eyes, healthy immune system, and cell growth. 

    It can be found in many fruits, vegetables, eggs, milk, butter, meat, fish etc.

    Option C is correct.
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