Within the list shown below, the correct pair | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) Alanine is a neutral amino acid with an isoelectric point $(pI)$ of approximately $6.0$.In an acidic medium ($pH$ $2-4$), which is below the $pI$,

Vedclass · Accepted Answer

$I$ and $II$

Vedclass · Answer

(A) Alanine is a neutral amino acid with an isoelectric point $(pI)$ of approximately $6.0$.In an acidic medium ($pH$ $2-4$), which is below the $pI$, the amino group becomes protonated, and the molecule exists as a cation: $H_{3}N^{+}CH(CH_{3})COOH$ (Structure $I$).In a basic medium ($pH$ $9-11$), which is above the $pI$, the carboxyl group becomes deprotonated, and the molecule exists as an anion: $H_{2}NCH(CH_{3})COO^{-}$ (Structure $II$).Therefore, the correct pair is $I$ and $II$.

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

Within the list shown below, the correct pair of structures of alanine in $pH$ ranges $2-4$ and $9-11$ is:
$I$. $H_{3}N^{+}CH(CH_{3})COOH$
$II$. $H_{2}NCH(CH_{3})COO^{-}$
$III$. $H_{3}N^{+}CH(CH_{3})COO^{-}$
$IV$. $H_{2}NCH(CH_{3})COOH$

Similar Questions

The secondary structure of protein is determined by

Assertion : Proteins are made up of $\alpha-$ amino acids.
Reason : During denaturation,secondary and tertiary structures of proteins are destroyed.

All of the following statements apply to proteins except

Which of the following basic amino acids is the least basic?

Vedclass Test Series

Exam Paper Generator

Online Exam Module

Within the list shown below, the correct pair of structures of alanine in $pH$ ranges $2-4$ and $9-11$ is:$I$. $H_{3}N^{+}CH(CH_{3})COOH$$II$. $H_{2}NCH(CH_{3})COO^{-}$$III$. $H_{3}N^{+}CH(CH_{3})COO^{-}$$IV$. $H_{2}NCH(CH_{3})COOH$