Assess students' ability to recall and match the 20 standard proteinogenic amino acids by providing each amino acid's full name along with its standard three-letter and one-letter codes. Scope: canonical 20 amino acids used in proteins (exclude selenocysteine/pyrrolysine and post-translational variants); accept common name variants (e.g., aspartic acid/aspartate). Focus on straightforward memorization and recognition tasks appropriate for introductory undergraduate biochemistry.