Question:
Identify the side chain –R present in amino acid lysine.
Identify the side chain –R present in amino acid lysine.
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Lysine, arginine, and histidine are basic amino acids due to extra –NH\(_2\) groups.
Updated On: Feb 11, 2026
- –C\(_6\)H\(_5\)–
- –(CH\(_2\))\(_4\)–NH\(_2\)
- –CH\(_2\)OH
- –CH(CH\(_3\))\(_2\)
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The Correct Option is B
Solution and Explanation
Step 1: Recall the structure of lysine.
Lysine is a basic amino acid with an additional amino group in its side chain.
Step 2: Write the general structure.
\[ \mathrm{NH_2-CH(R)-COOH} \]
Step 3: Identify the side chain of lysine.
The side chain consists of four methylene groups followed by an amino group:
\[ \mathrm{R = -(CH_2)_4-NH_2} \]
Step 4: Conclusion.
The correct side chain present in lysine is option (B).
Lysine is a basic amino acid with an additional amino group in its side chain.
Step 2: Write the general structure.
\[ \mathrm{NH_2-CH(R)-COOH} \]
Step 3: Identify the side chain of lysine.
The side chain consists of four methylene groups followed by an amino group:
\[ \mathrm{R = -(CH_2)_4-NH_2} \]
Step 4: Conclusion.
The correct side chain present in lysine is option (B).
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