Home
Class 12
CHEMISTRY
The pH value of a solution in which a po...

The pH value of a solution in which a polar amino acid doesn't migrate under the influence of an electric field is called

A

isoelectronic point

B

isoelectric point

C

neutralisation point

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
B
At Iso Electric point the Ion does not move to wards anode (or) cathode.
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

The pH value of a solution in which a polar amino acid does not migrate under the influence of electric field is called

The pH value in acidic solution is

Splitting of spectral lines under the influence of strong magnetic field is called

Splitting of spectral lines under the influence of strong magnetic field is called

Splitting of spectral lines under the influence of strong magnetic field is called

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) .

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) N - terminus of the peptide structure is on the

(A) At isoelectric point, the amino group does not migrate under the influence of electric field. (R) At isoelectric point, amino acid exists as a zwitter ion.

AAKASH SERIES-PROTEINS AND NUCLEIC ACIDS -LEVEL - II LECTURE SHEET (EXERCISE - I)
  1. Consider in the compound given : The correct order of acidic ...

    Text Solution

    |

  2. One of the essential alpha amino acids is

    Text Solution

    |

  3. The pH value of a solution in which a polar amino acid doesn't migrate...

    Text Solution

    |

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

    Text Solution

    |

  5. Which amino acid is achiral ?

    Text Solution

    |

  6. Which is not a true statement ?

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

  10. Peptides on hydrolysis gives

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

  13. Isoelectric point is

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

  20. Proteins give

    Text Solution

    |