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(A) : An aqueous solution of glycine of ...

(A) : An aqueous solution of glycine of pH = 7 is not electrically neutral.
(R ) : The isoelectric point of glycine, PI is 6.0.

A

Both (A) and (R ) are true and (R ) is the correct explanation of (A)

B

Both (A) and (R ) are true and (R ) is not the correct explanation of (A)

C

(A) is true but (R ) is false

D

(A) is false but (R ) is true

Text Solution

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The correct Answer is:
A
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alpha - amino acids are high melting crystalline solids because of the zwitterion structure. They are moderately soluble in water. In acidic medium, alpha - amino acids exist as cations (I) and thus migrate towards cathode under the influence of an electric field. On the other hand, in alkaline medium, alpha - amino acids exist as anions (III) and thus migrate towards anode under the influence of an electric field. However, at some intermediate value of p^(H) , the concentration of the cationic form (I) and anionic form (III) will become equal and consequently the alpha - amino acid will exist primarily as the neutral dipolar ion (II). At this p^(H) , there would be no net migration of the amino acid in an electric field. This p^(H) at which there is no net migration of the amino acid under the influence of an applied electric field is called isoelectric point (pI). Each amino acid has a characteristic isoelectric point. The pH of an amino acid that does not have an ionisable side chain such as alanine isd average of pK_(a) values of the carboxyl group and the protonated amino group. H_(3)overset(+)(N)-overset("R")overset("|")("C")H-COOH overset(" "OH^(-)" ")underset(" "H^(+)" ")hArr H_(3)overset(+)(N)-underset("Zwitterion (II)")(overset("R")overset("|")("C")H)-COO^(-)overset(" "OH^(-)" ")underset(" "H^(+)" ")hArr underset((III))(overset(+)(N)-overset("R")overset("|")("C")H)-COO^(-) Further, the alpha - carbon of all the amino acids (except glycine) is chiral (asymmetric) and hence amino acids can exist in teo stereoisomeric forms i.e., D and L. However, all the nautrally occurring amino acids belong to the L - series. underset("L(-)Glyceraldehyde")(HO-overset("CHO ")overset("| ")underset(" "CH_(2)OH)underset("| ")("C ")-H)" " underset("L-Amino acid")(H_(2)N-overset("COOH")overset("| ")underset("R ")underset("| ")("C ")-H) In alanine, carboxyl group ionises at pK_(a1)=2.34 and ammonium ion at pK_(a2)=9.69 . The isoelectric point of the amino acid is at p^(H) .

AAKASH SERIES-PROTEINS AND NUCLEIC ACIDS -PRACTICE SHEET - 4
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  2. Anti bodies are ………..

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  3. Proteins overset(" x ")underset(H(2)O)rarr Aminoacids 'x' is an enz...

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  4. Composition of DNA is …………

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  5. Insulin is an example of

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  6. In DNA strand at 136^(th) position is the base thymine, then the base ...

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  7. Which of the following has an aromatic ring ?

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  8. At p^(H)=4 Glycine exist as

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  9. Which of the following element is present in insulin ?

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  10. Iodine value is related to in our system is

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  11. Acrolin test is negative for

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  12. The waxes are long chain compounds of fatty acids and they does not be...

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  13. Which of the following/s is/are not deficiency disease of vitamine - E

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  14. Kwashiorkar is caused by the deficiency of

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  15. The number of Amino acids in the two protomers of insulin are

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  16. Walls of blood vessels, ligaments are called …………

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  17. Which of the following is true statement

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  18. Proteins can also be classified based on their shapes and solubility i...

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  19. Proteins can also be classified based on their shapes and solubility i...

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  20. Proteins can also be classified based on their shapes and solubility i...

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  21. The deficiency of enzyme in living system can cause many diseases. For...

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