{"knowledge_schema": {"broad_category": "Biochemistry \u2192 Post-Translational Modifications \u2192 Protein Modification Analysis", "refinement": "This problem involves understanding the effects of specific post-translational modifications, such as lactylation, on protein mass and how these changes can be detected using mass spectrometry.", "specific_scope": "The focus is on identifying the correct m/z value that corresponds to the lactylation of a specific lysine residue in a peptide sequence, based on the mass increase due to the modification.", "goal": "Determine which m/z value indicates the presence of lactylation on the lysine residue in the peptide GFLKQWERT."}, "summary": "This problem relates to biochemistry and the analysis of post-translational modifications of proteins, specifically lactylation. The task is to identify the m/z value that reflects the mass change due to the lactylation of a lysine residue in the peptide sequence GFLKQWERT. By understanding the mass increase associated with lactylation, students can deduce which of the provided m/z values corresponds to the modified peptide. The correct answer is 325.200, indicating the presence of lactylation."}