(C) The isoelectric point $(pI)$ is defined as the $pH$ at which a molecule carries no net electrical charge.At the isoelectric point,the concentratio

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(C) The isoelectric point $(pI)$ is defined as the $pH$ at which a molecule carries no net electrical charge.At the isoelectric point,the concentration of the zwitterionic form of an amino acid is at its maximum.Since the isoelectric point of alanine is $6$,the maximum concentration of its zwitterion occurs at $pH = 6$.

Class 12 Chemistry Biomolecules Amino Acids and Proteins

Medium

The isoelectric point of alanine is $pH = 6$. At which $pH$ will the maximum concentration of the zwitterion of alanine be present?

A
$pH > 6$
B
$pH < 6$
C
$pH = 6$
D
$pH = 7$

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Class 12

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Biomolecules

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Amino Acids and Proteins

Which functional group participates in disulphide bond formation in proteins?

MediumAIPMT 2005

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What are the products of the enzymatic hydrolysis of proteins?

Easy

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Which one of the following is an essential amino acid?

Easy

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The substituents $R_1$ and $R_2$ for nine peptides are listed in the table given below. How many of these peptides are positively charged at $pH = 7.0$?
Peptide $R_1$ $R_2$
$I$ $H$ $H$
$II$ $H$ $CH_3$
$III$ $CH_2COOH$ $H$
$IV$ $CH_2CONH_2$ $(CH_2)_4NH_2$
$V$ $CH_2CONH_2$ $CH_2CONH_2$
$VI$ $(CH_2)_4NH_2$ $(CH_2)_4NH_2$
$VII$ $CH_2COOH$ $CH_2CONH_2$
$VIII$ $CH_2OH$ $(CH_2)_4NH_2$
$IX$ $(CH_2)_4NH_2$ $CH_3$

Peptide	$R_1$	$R_2$
$I$	$H$	$H$
$II$	$H$	$CH_3$
$III$	$CH_2COOH$	$H$
$IV$	$CH_2CONH_2$	$(CH_2)_4NH_2$
$V$	$CH_2CONH_2$	$CH_2CONH_2$
$VI$	$(CH_2)_4NH_2$	$(CH_2)_4NH_2$
$VII$	$CH_2COOH$	$CH_2CONH_2$
$VIII$	$CH_2OH$	$(CH_2)_4NH_2$
$IX$	$(CH_2)_4NH_2$	$CH_3$