Which of the following are basic amino acids or negatively c

Which of the following are basic amino acids or negatively charged amino acids?
   Histidine
   Methionine
   Asparagine
   Aspartate

Solution

1. Lysine, histidine, and arginine are basic amino acids. Histidine is a semi-essential amino acid.   It contains an imidazole ring.

2. Methionine is a sulfur containing amino acid with a thioether group.

3. Aspartate is an acidic amino acid which is a non-essential amino acid.

4. Asparagine is the amide of aspartate.

Therefore, histidine is the basic amino acid among the above amino acids.