OK, I get that. A particular test in action may confirm or deny any particular hypothesis. If the test fails, then so does the hypothesis. If the test succeeds, the we may form a Universal Statement from the test results.
Yet another test still has the potential for falsifying the hypothesis, regardless of the first test results.
From many different falsifiable, yet positive test results, a theory is formed. And thus laws are formed when all falsifiable positive test results have been accounted for. A rare thing indeed.
So to the OP, “What’s a good question to use the scientific method on?”
How about my favorite, “Is life designed”?
So from your specific instructions in your details:
1) Propose a question of some subject that involves Biology.
Is the genetic code a product of sentient authorship?
2) Create a hypothesis.
Sentient authorship is the only mechanism that can create code.
3) What experiments would you use to answer that/those questions?
Assemble a group of random objects together that have code clearly written upon them. Examples of such objects would be a bottle cap, a watch, a business card, a drivers license, student I.D., a gift card, a random note, music sheet, and you could even go so far as to record whale song, wolf howls, and a video of the figure 8 bee waggle dance.
Pursue determining the origins of the codes you have assembled.
Many of these examples have no obvious authors, like the bottle cap, or a book with its cover ripped away, or the numbering on a watch. The supposed authors would be anonymous. So you may have some difficulty tracking down their origins.
But as long as you could attribute some of the codes to sentient authors, then you can confidently infer that all codes, including the genetic code, does in fact have a sentient author.
Is this hypothesis falsifiable? Absolutely yes. Anyone can falsify the hypothesis: Sentient authorship is the only mechanism that can create code. Just demonstrate another mechanism that can create code other than sentient authorship. That possibility is always out there. But until another mechanism is demonstrated, the original hypothesis will stand.
Therefor, The genetic code is a product of sentient authorship, if and only if, all codes have sentient authors.