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The basic amino acids are:

1. Iysine, arginine
2. alanine, glutamic acid
3. proline, valine
4. alanine, cystein

Correct answer: Iysine, arginine

Solution

Lysine and arginine have side chains that can accept a proton, so they are classified as basic amino acids. The other options contain neutral or acidic amino acids, not basic ones.

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