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Biomolecules Test - 87

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Biomolecules Test - 87
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  • Question 1
    1 / -0
    A carbohydrate that cannot be hydrolysed to simpler forms is called :
    Solution
    Monosaccharide cannot be hydrolysed to simple forms.
  • Question 2
    1 / -0
    Which carbohydrates has highest abundance in human blood
    Solution
    $$\text{Blood sugar, or glucose, is the main carbohydrates found in blood.}$$The human body contains approximately 5 liters of blood. This amounts to 4 grams of sugar in the blood,
  • Question 3
    1 / -0
    Starch can be used as an indicator for the detection of traces of
    Solution
    Starch solution is colourless but changes its colour in iodine solution.

    $$Starch+\underset{(violet)}{Iodine}\rightarrow \underset{(blue-black)}{Starch\,Iodine}$$
  • Question 4
    1 / -0

    Directions For Questions

    An amino acid is characterized by two $$pka$$ values the one corresponding to the more acidic site is designated as $$pka_1$$ and the other corresponding to the less acidic site is designated as $$pka_2$$. The isoelectric point also called isoionic point $$(pI)$$ is the $$pH$$ at which concentration of zwitterion is maximum. $$pI$$ is the average of $$pka_1$$ and $$pka_2$$. Generally the value of $$pI$$ is slightly less than $$7$$.
    Some amino acids have side chain with acidic or basic groups. These amino acids have $$pka_3$$ value also for the side chain. The acidic amino acids have acidic side chains basic amino acids have basic side chains. $$pI$$ for an acidic amino acid is an average of $$pka_1$$ and $$pka_3$$. $$pI$$ of a basic amino acid is the average of $$pka_2$$ and $$pka_3$$.
     S. No.Amino acid $$P^{ka1}$$ $$P^{ka2}$$ $$P^{ka3}$$ (side chain) 
     I Aspartic acid $$1.88$$$$9.6 $$$$3.65 $$
     II Glutamic acid $$2.19$$$$9.67$$ $$4.25$$ 
     III Lysine $$2.18$$ $$8.95$$ $$10.53$$
     IV Arginine $$2.17$$$$9.04$$ $$12.48$$ 

    ...view full instructions

    In the table given above the acidic amino acids are______
    Solution
    $$pka_3$$ value of side-chain determine the nature of the amino acid

    Option A is correct.
  • Question 5
    1 / -0
    Nitrous acid $$(HNO_2)$$ converts amino acids into hydroxy acids with retention of configuration. Estimation of nitrogen gas evolved in the reaction is the reaction is the basis of Van slyke estimation of amino acids.

    $$R - \overset{NH_2}{\overset{|}{C}H} - COOH \xrightarrow{HNO_2} R - \overset{OH}{\overset{|}{C}H} - COOH + N_2 \uparrow + H_2O$$

    Which of the following amino acids cannot be analysed by Van slyke method? 

    Solution
    Since proline has $$2^{\circ}$$ amino group

    Hence, nitrogen gas not evolved.

    Option B is correct.
  • Question 6
    1 / -0
    Glucose and fructose form
    Solution
    When $$\text{sugars}$$ react with an $$\text{excess of phenylhydrazine,}$$ a class of compounds known as $$\text{osazone}$$ is formed. 

    $$\text{Glucose and fructose}$$ differ in the arrangement of atoms around the C−1 and C−2 carbon. When both of them react with three molecules of phenylhydrazine, the formation of osazone crystals makes the difference between the carbon atoms in their chain and hence $$\text{they form the same osazone.}$$

  • Question 7
    1 / -0
    Carbohydrates are
    Solution
    $$\text{They are organic compounds organized in the form of aldehydes or ketones with multiple hydroxyl groups}$$ coming off the carbon chain.
    $$\text{The general empirical structure for carbohydrates is}$$ $$(CH_2O)_n.$$
  • Question 8
    1 / -0
    Which of the following shows the maximum hydrophobic behaviour
    Solution
    Adenine has the least tendency to attract with water molecules.
    Hence it has the maximum hydrophobic behavior.
  • Question 9
    1 / -0
    Which of the following is not present in nucleic acids
    Solution

    The answer is (B). 2-aminopyridine is not present in nucleic acid and as cytosine, Adenine, Thymine and GUANINE are the four main bases found in nucleic acid. Adenine and Guanine are purines while thymine and cytosine are pyrimidines. They together form triple bonded histones of DNA.

    2-Aminopyridine is an organic compound with the formula $$H_2NC_5H_4$$N. It is one of three isomeric aminopyridines
  • Question 10
    1 / -0
    Ascorbic acid is a
    Solution
    $$\text{Ascorbic Acid is a natural water-soluble vitamin (Vitamin C).}$$ Ascorbic acid is a potent reducing and antioxidant agent that functions in fighting bacterial infections, in detoxifying reactions, and in the formation of collagen in fibrous tissue, teeth, bones, connective tissue, skin, and capillaries.
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