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Question
Give a reason for the following observations:
Amino acids behave like salts.
Solution
Instead of being simple amines or carboxylic acids, amino acids behave like salts. The presence of both acidic (carboxylic group) and basic (amino group) groups in the same molecule causes this behaviour.
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RELATED QUESTIONS
Define the following term as related to proteins:
Primary structure
How do you explain the amphoteric behaviour of amino acids?
The functional group which is found in amino acids is:
Amino acids are the building blocks of ____________.
Amino acids are classified as acidic, basic or neutral depending upon the relative number of amino and carboxyl groups in their molecule. Which of the following are acidic?
(i)
\[\begin{array}{cc}
\ce{(CH3)2CH - CH - COOH}\\
\phantom{..}|\\
\phantom{.....}\ce{NH2}
\end{array}\]
(ii)
\[\begin{array}{cc}
\ce{HOOC - CH2 - CH2 - CH - COOH}\\
\phantom{............}|\\
\phantom{...............}\ce{NH2}
\end{array}\]
(iii)
\[\ce{H2N - CH2 - CH2 - CH2 - COOH}\]
(iv)
\[\begin{array}{cc}
\ce{HOOC - CH2 - CH - COOH}\\
\phantom{.....}|\\
\phantom{........}\ce{NH2}
\end{array}\]
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Reason: It is an essential amino acid.
Which of the following is an ester?
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Draw the zwitter ion structure for sulphanilic acid.
