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Biomolecules Test - 70

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Biomolecules Test - 70
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  • Question 1
    1 / -0
    Starch is converted into maltose in about half an hour's time by:
    Solution
    Starch is converted into maltose by an enzyme diastase. During this process, in this regime the diastatic enzymes start acting on the starches, breaking them up into sugars (hence the term saccharification).
  • Question 2
    1 / -0
    Raffinose on hydrolysis forms:
    Solution

    Raffinose is a trisaccharide and consists of 1 unit of glucose, fructose and galactose each. 

    So on hydrolysis, it breaks into glucose, fructose and galactose. 

  • Question 3
    1 / -0
    Charring of sugar is due to:
    Solution
    When sugar is continuously heated in a dish, then it starts evaporating and becomes foggy due to water vapour. A black powdery substance is left behind, which is charcoal. This process is called charring of sugar. It is a chemical change as it cannot be reversed.
  • Question 4
    1 / -0
    Which of the following is a disaccharide?
    Solution
    Sucrose is common sugar. It is a disaccharide, a molecule composed of two monosaccharides: glucose and fructose.

  • Question 5
    1 / -0
    Nucleic acids are:
    Solution
    Nucleic acids are the biopolymers, or large biomolecules, essential to all known forms of life. The term nucleic acid is the overall name for DNA and RNA. They are composed of nucleotides, which are the monomers made of three components: a 5-carbon sugar, a phosphate group and a nitrogenous base.
  • Question 6
    1 / -0
    On hydrolysis of starch, we finally get:
    Solution
    Starch is hydrolysed with dilute acids or enzymes and break down to molecules of variable complexity and finally gives D-glucose.

  • Question 7
    1 / -0
    The aqueous solution of carbohydrate gave a dark blue colour with iodine solution. The carbohydrate is:
    Solution
    $$Starch +I_2\rightarrow Blue\,colour$$

    $$\text{When you put iodine on the carbohydrate samples, one of them will turn dark blue and the other will be a}$$ $$\text{reddish-brown. iodine is an indicator that turns dark blue in the presence of starch.}$$

  • Question 8
    1 / -0
    The best source of vitamin A is :
    Solution
    The best source of vitamin A is carrot.
  • Question 9
    1 / -0
    A mixture of amlyose and amylopectin is
    Solution
    Starch is a mixture of two polymers: amylose and amylopectin. Natural starches consist of about 10%–30% amylose and 70%–90% amylopectin.
  • Question 10
    1 / -0
     Iodine test is shown by: 
    Solution
     Iodine test is shown by starch.
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