Question: what methods are used to measure the activity of an enzyme
[{'answer': 'Enzyme assays', 'provenance': [{'wikipedia_id': '2634856', 'title': 'Enzyme assay', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 13, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2634856', 'title': 'Enzyme assay', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 140, 'bleu_score': 0.9067110266941041, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5328602232783926699}, 'section': 'Section::::Abstract.'}]}]