Question:

Amino acids are represented by the following general structure: 

Find out the pair in which amino acid is correctly matched with its group R: 
 

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Remember the R groups of common amino acids and their classifications (basic, acidic, polar, nonpolar).
Updated On: Mar 15, 2025
  • Lys - -(CH\(_2\))\(_4\)-NH\(_2\)
  • Val - -CH\(_2\)CH(CH\(_3\))\(_2\)
  • Thr - -CH\(_2\)OH
  • Asp - -CH\(_2\)CONH\(_2\)
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The Correct Option is A

Solution and Explanation

1. Lysine (Lys):

The R group of lysine is -(CH\(_2\))\(_4\)-NH\(_2\).
This makes lysine a basic amino acid due to the presence of an additional amino group in the side chain.

2. Valine (Val):

The R group of valine is -CH(CH\(_3\))\(_2\).
The given option -CH\(_2\)CH(CH\(_3\))\(_2\) is incorrect.

3. Threonine (Thr):

The R group of threonine is -CH(OH)CH\(_3\).
The given option -CH\(_2\)OH is incorrect.

4. Asparagine (Asp):

The R group of asparagine is -CH\(_2\)CONH\(_2\).
The given option -CH\(_2\)CONH\(_2\) is for asparagine, not aspartic acid. Aspartic acid's R group is -CH\(_2\)COOH.

Therefore, the correct match is Lys - -(CH\(_2\))\(_4\)-NH\(_2\).

Final Answer:
Lys - -(CH\(_2\))\(_4\)-NH\(_2\).
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