Question: where is the electron transport chain located in bacteria
[{'answer': 'in their cell membrane', 'provenance': [{'wikipedia_id': '92236', 'title': 'Electron transport chain', 'start_paragraph_id': 2, 'start_character': 519, 'end_paragraph_id': 2, 'end_character': 541, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '92236', 'title': 'Electron transport chain', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 541, 'bleu_score': 0.976043556018343, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18243967708810347797}, 'section': 'Section::::Abstract.'}]}]