Assertion: $\alpha$-amino acids exist as internal salt in solution as they have amino and carboxylic acid groups in near vicinity.
Reason: $H^{+}$ ion given by carboxylic group $(-COOH)$ is captured by amino group $(-NH_2)$ having lone pair of electrons.
Reason: $H^{+}$ ion given by carboxylic group $(-COOH)$ is captured by amino group $(-NH_2)$ having lone pair of electrons.
- AIf both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
- BIf both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
- CIf the Assertion is correct but Reason is incorrect.
- DIf both the Assertion and Reason are incorrect.
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Similar Questions
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 | $R_1$ | $R_2$ |
|---|---|---|
| $I$ | $H$ | $H$ |
| $II$ | $H$ | $CH_3$ |
| $III$ | $CH_2COOH$ | $H$ |
| $IV$ | $CH_2CONH_2$ | $(CH_2)_4NH_2$ |
| $V$ | $CH_2CONH_2$ | $CH_2CONH_2$ |
| $VI$ | $(CH_2)_4NH_2$ | $(CH_2)_4NH_2$ |
| $VII$ | $CH_2COOH$ | $CH_2CONH_2$ |
| $VIII$ | $CH_2OH$ | $(CH_2)_4NH_2$ |
| $IX$ | $(CH_2)_4NH_2$ | $CH_3$ |
Which of the following statements are correct?
$A$) $\alpha$-amino acids present in proteins are $L$-amino acids.
$B$) Amino acids contain both $-NH_2$ and $-COOH$ groups.
$C$) The number of amino groups and carboxylic groups is always the same in amino acids.
$D$) Tyrosine was first obtained from cheese.
Choose the correct alternatives from below:
$A$) $\alpha$-amino acids present in proteins are $L$-amino acids.
$B$) Amino acids contain both $-NH_2$ and $-COOH$ groups.
$C$) The number of amino groups and carboxylic groups is always the same in amino acids.
$D$) Tyrosine was first obtained from cheese.
Choose the correct alternatives from below:
Match the following types of proteins with their properties:
Type of Protein Their Properties $(A)$ Fibrous $1$. Hydrogen bonding $(B)$ Globular $2$. Water soluble $3$. Spherical shape $4$. Disulphide linkage
| Type of Protein | Their Properties |
|---|---|
| $(A)$ Fibrous | $1$. Hydrogen bonding |
| $(B)$ Globular | $2$. Water soluble |
| $3$. Spherical shape | |
| $4$. Disulphide linkage |
DifficultAP EAMCET 2021
View SolutionWhich type of linkage is present in the structure of proteins?
Medium
View SolutionOut of the following,which type of interaction is responsible for the stabilisation of $\alpha$-helix structure of proteins?
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