Home
Class 12
CHEMISTRY
In an electric field, if an amino acid m...

In an electric field, if an amino acid migrates towards cathode, the pH of the solution is said to be

A

less than pI

B

more than pI

C

equal than pI

D

7 (seven)

Text Solution

Verified by Experts

The correct Answer is:
A
`pH lt p_(1)` the amino acid migrate towards cathode [cat ionic form]
Promotional Banner

Topper's Solved these Questions

  • PROTEINS AND NUCLEIC ACIDS

    AAKASH SERIES|Exercise LEVEL - II LECTURE SHEET (EXERCISE - II)|4 Videos

  • PROTEINS AND NUCLEIC ACIDS

    AAKASH SERIES|Exercise LEVEL - II LECTURE SHEET (EXERCISE - III)|3 Videos

  • PROTEINS AND NUCLEIC ACIDS

    AAKASH SERIES|Exercise PRACTICE SHEET - 4|30 Videos

  • PRINCIPLES OF METALLURGY

    AAKASH SERIES|Exercise SUBJECTIVE EXERCISE-2 (LONG ANSWER QUESTIONS )|7 Videos

  • REDOX REACTONS

    AAKASH SERIES|Exercise Questions For Descriptive Answers|27 Videos

Similar Questions

Explore conceptually related problems

(A) : In electric field, an amino acid migrate towards cathode when pH gt pI (R ) : When pH is greater than PI anionic form of amino acid predominates.

A colloidal solution is subjected to an electrical field. The particles move towards anode. The coagulation of same sol is studied using NaCl, BaCl_2 and AIC_3 solutions. Their coagulating power should be

How do you use pH scale to know whether a solution is acid or base ?

In the titration of acetic acid versus sodium hydroxide , the pH of the solution at equivalence point (whene temperature is 25^(@)C ) is :

The pH value in acidic solution is

(A) : Lysine (PI = 9.6) and glycine (PI = 5.97) could be separated by electrophoresis (R ) : In the electrophoresis process if the pH of the solution is maintained either at 9.6 or 5.97, one will migrate towards electric pole while other wouldn't.

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) Which of structural formula of lysine (NH_(2)-overset("COOH")overset("| ")("C ")H-CH_(2)-CH_(2)-CH_(2)-CH_(2)NH_(2)) at pH 13 ?

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 -LEVEL - II LECTURE SHEET (EXERCISE - I)
  1. The pH value of a solution in which a polar amino acid doesn't migrate...

    Text Solution

    |

  2. The structural feature which distinguishes proline from alpha - amino ...

    Text Solution

    |

  3. Which amino acid is achiral ?

    Text Solution

    |

  4. Which is not a true statement ?

    Text Solution

    |

  5. Which of the following structure represents the peptide chain ?

    Text Solution

    |

  6. All common amino acids except one react with cold nitrous acid (HNO(2)...

    Text Solution

    |

  7. The amino acid cysteine often forms a disulphide bond with another nea...

    Text Solution

    |

  8. Peptides on hydrolysis gives

    Text Solution

    |

  9. Peptides are composed of amino acids joined by amide bonds. Which of t...

    Text Solution

    |

  10. Which of the following is used in a colour test of amino acid ?

    Text Solution

    |

  11. Isoelectric point is

    Text Solution

    |

  12. Histidine has pK(a1)=1.8, pK(a2)=09.2 and pK(a3)=6.0. The isoelectric ...

    Text Solution

    |

  13. Glutamic acid, H(2)N-CH(CH(2)CH(2)COOH)COOH has pK(a1),(alpha-COOH)=2....

    Text Solution

    |

  14. Which of the following is the major solute species in a solution of ly...

    Text Solution

    |

  15. In an electric field, if an amino acid migrates towards cathode, the p...

    Text Solution

    |

  16. During the process of digestion, the proteins present in food material...

    Text Solution

    |

  17. The helical structure or a secondary structure of proteins is stabilis...

    Text Solution

    |

  18. Proteins give

    Text Solution

    |

  19. The destruction of the biological nature and activity of proteins by h...

    Text Solution

    |

  20. The primary structure of protein is based upon the

    Text Solution

    |