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: 
 

• A. Lys - -(CH\(_2\))\(_4\)-NH\(_2\)
• B. Val - -CH\(_2\)CH(CH\(_3\))\(_2\)
• C. Thr - -CH\(_2\)OH
• D. Asp - -CH\(_2\)CONH\(_2\)

Hint:

Remember the R groups of common amino acids and their classifications (basic, acidic, polar, nonpolar).

Answer 1

The Correct Option is A

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\(_2\).