Questions: Just output the content of the question, DO NOT output additional information or explanations.

Just output the content of the question, DO NOT output additional information or explanations.
Transcript text: Just output the content of the question, DO NOT output additional information or explanations.
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Solution

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Solution Steps

Step 1: Identify the Molecule

The molecule shown in the image is lysine, an essential amino acid. It has an amino group (NH3+), a carboxyl group (COO-), and a side chain consisting of a four-carbon aliphatic straight chain ending in an amino group (NH3+).

Step 2: Determine the Nature of the Side Chain

Lysine has a side chain that is positively charged at physiological pH due to the presence of the terminal amino group (NH3+).

Step 3: Classify the Side Chain

The side chain of lysine is classified as basic because it contains an amino group that can accept a proton, giving it a positive charge.

Final Answer

The side chain of lysine is basic.

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