looking for advice about job in PI’s colleague’s lab

hi all– so I’m graduating in a couple of weeks with my Bachelor’s, and I’ve been trying to find a job to no avail. My PI has a connection at an ivy that she found out was hiring, and sent them my CV; I have an interview with them on Wednesday. I wasn’t super excited about this job, because although I’m grateful that my PI is willing to orchestrate this for me, I’m kind of looking to transition out of the field we’re in (microbiology) and into research that’s more hard-and-fast biomedical (like cancer biology), which I would like to eventually do a PhD in. The lab I’d interview with is another microbiology lab, that does research that’s in the medical school, but more biomedicine-adjacent. To be honest, I’m kind of looking to get away from the microbes.

However, I’ve been communicating with them, and they explained to me beforehand that 50% of the time I’d be working on this marine microbial ecology project, which has kind of a climate change angle to it. They didn’t specify what I’d be doing the other 50% of the time, just that there were “other projects available”.

I’m very grateful for this opportunity kind of falling into my lap, and I know how abysmal the job market for research technician jobs is right now. That being said, I don’t feel very interested in this job. The location is highly undesirable to me as well.

Would it be impolite to express these feelings in my interview? How should I go about asking to not be a part of the marine ecology project?

Would spending so much time doing microbiology research put me at a disadvantage if I tried to apply to graduate schools in a different field?

Should I take this job if it’s offered to me, even if I’m not interested in it? Is this the only chance I’ll probably get?

Thanks!