Final answer:
The section of a journal article that describes relevant theories and concepts used to identify research questions is the Literature review section.
Step-by-step explanation:
The section of a journal article that typically describes the relevant theories and concepts used to identify appropriate research questions or hypotheses is the Literature review section. In the literature review, researchers review and summarize previous academic research related to the topic, including a synthesis that makes a case for why the research is important and necessary. They also cite relevant studies to show awareness of the research already done in the field.