Academic interest and major essays
Academic interest prompts aren't asking you to prove you've picked a major. They're asking how your mind works when something grabs it. Show the moment an idea hooked you, then what you did next: the book you went looking for, the experiment that failed, the question you still can't answer. That chain of curiosity is what readers remember.
Be specific about the subject. “I love biology” says nothing. “I want to know why some cells ignore the signal to stop dividing” says a lot.
If the prompt names a school within the university or a program, connect your interest to it with real details from its course pages. If you're undecided, say so, and write about the questions pulling you in more than one direction. That's honest, and many colleges don't ask you to declare a major when you apply. Just don't pad. A list of AP courses is a transcript, not an essay.