QBManager

CHXII14:BIOMOLECULES

324451 Lysine is least soluble in water in the $pH$ range

1

3 - 4

2

5 - 6

3

6 - 7

4

8 - 9

Explanation:

Lysine is $α, \in$ - diaminocaproic acid.
$H_{2} N - {CH}_{2} - {CH}_{2} - {CH}_{2} - {CH}_{2}$
$CH ({NH}_{2}) \cdot COOH$
It is least soluble in water in the $pH$ range $6 - 7$ .

AIIMS - 2006

CHXII14:BIOMOLECULES

324452 Assertion :
Alpha ( $α$ )-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.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

${NH}_{2} - {CH}_{2} - COOH$ is a typical $α -$ amino acid. In solution it exists as, internal salt or
Zwitter ion, $(\overset{+}{N} H_{3} - C H_{2} - CO \bar{O})$ because the proton $(H^{+})$ of $- COOH$ group is captured by $- {NH}_{2}$ group as ${NH}_{2}$ has a lone pair of electrons on $N$ atom. So, option (1) is correct.

CHXII14:BIOMOLECULES

324453 Assertion :
Solubility of proteins is minimum at the isoelectric point.
Reason :
At isoelectric point, protein molecule behaves as a zwitter ion.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

CHXII14:BIOMOLECULES

324454 Which is not true for arginine?

1 It has a fairly high melting point.

2 It has high solubility in benzene.

3 It is associated with more than one

{pK}_{a}

values.

4 It is a crystalline solid.

JEE - 2023

CHXII14:BIOMOLECULES

324455 Assertion :
Simple proteins on hydrolysis gives $α$ -amino acids.
Reason :
Prosthetic group is present in simple proteins.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

Conjugated proteins contain a prosthetic group. These proteins on hydrolysis give a non-protein part in addition to $α$ -amino acids which is called the prosthetic group. So, option (3) is correct.

CHXII14:BIOMOLECULES

324451 Lysine is least soluble in water in the $pH$ range

1

3 - 4

2

5 - 6

3

6 - 7

4

8 - 9

Explanation:

Lysine is $α, \in$ - diaminocaproic acid.
$H_{2} N - {CH}_{2} - {CH}_{2} - {CH}_{2} - {CH}_{2}$
$CH ({NH}_{2}) \cdot COOH$
It is least soluble in water in the $pH$ range $6 - 7$ .

AIIMS - 2006

CHXII14:BIOMOLECULES

324452 Assertion :
Alpha ( $α$ )-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.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

${NH}_{2} - {CH}_{2} - COOH$ is a typical $α -$ amino acid. In solution it exists as, internal salt or
Zwitter ion, $(\overset{+}{N} H_{3} - C H_{2} - CO \bar{O})$ because the proton $(H^{+})$ of $- COOH$ group is captured by $- {NH}_{2}$ group as ${NH}_{2}$ has a lone pair of electrons on $N$ atom. So, option (1) is correct.

CHXII14:BIOMOLECULES

324453 Assertion :
Solubility of proteins is minimum at the isoelectric point.
Reason :
At isoelectric point, protein molecule behaves as a zwitter ion.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

CHXII14:BIOMOLECULES

324454 Which is not true for arginine?

1 It has a fairly high melting point.

2 It has high solubility in benzene.

3 It is associated with more than one

{pK}_{a}

values.

4 It is a crystalline solid.

JEE - 2023

CHXII14:BIOMOLECULES

324455 Assertion :
Simple proteins on hydrolysis gives $α$ -amino acids.
Reason :
Prosthetic group is present in simple proteins.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

Conjugated proteins contain a prosthetic group. These proteins on hydrolysis give a non-protein part in addition to $α$ -amino acids which is called the prosthetic group. So, option (3) is correct.

CHXII14:BIOMOLECULES

324451 Lysine is least soluble in water in the $pH$ range

1

3 - 4

2

5 - 6

3

6 - 7

4

8 - 9

Explanation:

Lysine is $α, \in$ - diaminocaproic acid.
$H_{2} N - {CH}_{2} - {CH}_{2} - {CH}_{2} - {CH}_{2}$
$CH ({NH}_{2}) \cdot COOH$
It is least soluble in water in the $pH$ range $6 - 7$ .

AIIMS - 2006

CHXII14:BIOMOLECULES

324452 Assertion :
Alpha ( $α$ )-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.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

${NH}_{2} - {CH}_{2} - COOH$ is a typical $α -$ amino acid. In solution it exists as, internal salt or
Zwitter ion, $(\overset{+}{N} H_{3} - C H_{2} - CO \bar{O})$ because the proton $(H^{+})$ of $- COOH$ group is captured by $- {NH}_{2}$ group as ${NH}_{2}$ has a lone pair of electrons on $N$ atom. So, option (1) is correct.

CHXII14:BIOMOLECULES

324453 Assertion :
Solubility of proteins is minimum at the isoelectric point.
Reason :
At isoelectric point, protein molecule behaves as a zwitter ion.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

CHXII14:BIOMOLECULES

324454 Which is not true for arginine?

1 It has a fairly high melting point.

2 It has high solubility in benzene.

3 It is associated with more than one

{pK}_{a}

values.

4 It is a crystalline solid.

JEE - 2023

CHXII14:BIOMOLECULES

324455 Assertion :
Simple proteins on hydrolysis gives $α$ -amino acids.
Reason :
Prosthetic group is present in simple proteins.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

Conjugated proteins contain a prosthetic group. These proteins on hydrolysis give a non-protein part in addition to $α$ -amino acids which is called the prosthetic group. So, option (3) is correct.

CHXII14:BIOMOLECULES

324451 Lysine is least soluble in water in the $pH$ range

1

3 - 4

2

5 - 6

3

6 - 7

4

8 - 9

Explanation:

Lysine is $α, \in$ - diaminocaproic acid.
$H_{2} N - {CH}_{2} - {CH}_{2} - {CH}_{2} - {CH}_{2}$
$CH ({NH}_{2}) \cdot COOH$
It is least soluble in water in the $pH$ range $6 - 7$ .

AIIMS - 2006

CHXII14:BIOMOLECULES

324452 Assertion :
Alpha ( $α$ )-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.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

${NH}_{2} - {CH}_{2} - COOH$ is a typical $α -$ amino acid. In solution it exists as, internal salt or
Zwitter ion, $(\overset{+}{N} H_{3} - C H_{2} - CO \bar{O})$ because the proton $(H^{+})$ of $- COOH$ group is captured by $- {NH}_{2}$ group as ${NH}_{2}$ has a lone pair of electrons on $N$ atom. So, option (1) is correct.

CHXII14:BIOMOLECULES

324453 Assertion :
Solubility of proteins is minimum at the isoelectric point.
Reason :
At isoelectric point, protein molecule behaves as a zwitter ion.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

CHXII14:BIOMOLECULES

324454 Which is not true for arginine?

1 It has a fairly high melting point.

2 It has high solubility in benzene.

3 It is associated with more than one

{pK}_{a}

values.

4 It is a crystalline solid.

JEE - 2023

CHXII14:BIOMOLECULES

324455 Assertion :
Simple proteins on hydrolysis gives $α$ -amino acids.
Reason :
Prosthetic group is present in simple proteins.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

Conjugated proteins contain a prosthetic group. These proteins on hydrolysis give a non-protein part in addition to $α$ -amino acids which is called the prosthetic group. So, option (3) is correct.

CHXII14:BIOMOLECULES

324451 Lysine is least soluble in water in the $pH$ range

1

3 - 4

2

5 - 6

3

6 - 7

4

8 - 9

Explanation:

Lysine is $α, \in$ - diaminocaproic acid.
$H_{2} N - {CH}_{2} - {CH}_{2} - {CH}_{2} - {CH}_{2}$
$CH ({NH}_{2}) \cdot COOH$
It is least soluble in water in the $pH$ range $6 - 7$ .

AIIMS - 2006

CHXII14:BIOMOLECULES

324452 Assertion :
Alpha ( $α$ )-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.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

${NH}_{2} - {CH}_{2} - COOH$ is a typical $α -$ amino acid. In solution it exists as, internal salt or
Zwitter ion, $(\overset{+}{N} H_{3} - C H_{2} - CO \bar{O})$ because the proton $(H^{+})$ of $- COOH$ group is captured by $- {NH}_{2}$ group as ${NH}_{2}$ has a lone pair of electrons on $N$ atom. So, option (1) is correct.

CHXII14:BIOMOLECULES

324453 Assertion :
Solubility of proteins is minimum at the isoelectric point.
Reason :
At isoelectric point, protein molecule behaves as a zwitter ion.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

CHXII14:BIOMOLECULES

324454 Which is not true for arginine?

1 It has a fairly high melting point.

2 It has high solubility in benzene.

3 It is associated with more than one

{pK}_{a}

values.

4 It is a crystalline solid.

JEE - 2023

CHXII14:BIOMOLECULES

324455 Assertion :
Simple proteins on hydrolysis gives $α$ -amino acids.
Reason :
Prosthetic group is present in simple proteins.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

Conjugated proteins contain a prosthetic group. These proteins on hydrolysis give a non-protein part in addition to $α$ -amino acids which is called the prosthetic group. So, option (3) is correct.

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