Maybe noting biochem does get around this. One line in Addl Info can explain physics wasn’t an option in senior year. But talk with your GC about this. Consider the recomendations above to take an easier physics cource at cc. If this is planned by your submit date, it goes in the section listing 2nd semester courses. Yes, you could also note it in Addl Info. But keep the epxlanation there very brief. The don;t need details. Good for you for seeing this alternative.