Acidic amino acids carry two - COOH and one - NH $_{2}$ groups per molecule. With respect to this, select the correct pair of acidic amino acid.

Lysine and arginine

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Aspartic acid and glutamic acid

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Glycine and alanine

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Both A and B

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Solution

The correct option is D Both A and B
Two amino acids have acidic side chains at neutral pH. These are aspartic acid or aspartate and glutamic acid or glutamate. Their side chains have carboxylic acid groups whose pKa's are low enough to lose protons, becoming negatively charged in the process.
So, the correct answer is 'Both A and B'.

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Similar questions

Q. Select the correct option:

Acidic amino acids have two

- C O O H

groups and one

- N H_{2}

group per molecule. Select the pair that consists of acidic amino acids.

Choose the correct combination:

$a$	Fatty acid	$1.$	Glutamic acid
$b$	Phospholipid	$2.$	Tryptophan
$c$	Aromatic Amino Acid	$3.$	Lecithin
$d$	Acidic Amino Acid	$4.$	Palmitic acid

Amino acids are classified as acidic, basic or neutrl depending upon the relative number of amino and carboxyl groups in their molucule. Which of the following are acidic?
(a) $(C H_{3}) C H - C H | N H_{2} - C O O H$
(b) $H O O C - C H_{2} - C H_{2} - C H | N H_{2} - C O O H$
(c) $H_{2} N - C H_{2} - C H_{2} - C H_{2} - C O O H$
(d) $H O O C - C H_{2} - C H | N H_{2} - C O O H$

Q. Assertion :Reductive amination involves the transfer of amino group from one amino acid to the keto group of a keto acid. Reason: In reductive amination, transfer of

N H_{2}

from glutamic acid takes place.

Q. Assertion
All Amino acids exist as Zwitter ions.

Reason
Amino acids have both-

N H_{2}

and - COOH group.

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Acidic amino acids carry two - COOH and one - NH2 groups per molecule. With respect to this, select the correct pair of acidic amino acid.

Acidic amino acids carry two - COOH and one - NH $_{2}$ groups per molecule. With respect to this, select the correct pair of acidic amino acid.