I agree with what others are saying. Where you get your undergrad degree won’t matter if you’re wanting to do a PhD in a bio-related field. You shouldn’t do a PhD program without a guarantee of full funding and a stipend for the duration. There are plenty.
I am a biology professor. I personally know several bio-type profs at Mizzou. There is world-class research going on there, and at any other R1 (big research) institution. You can prepare for grad school just as well at smaller schools as well – you can still do research and you can try for summer REU programs to get a big school research experience.
Focus on getting into a college that is financially affordable and is a good fit for you personally. Do the best you can in your program, join bio-related clubs, try to get into a lab to do research early. Stick with the same lab if it’s a good fit. Develop relationships with that supervisor and a couple other professors. That’s what gets you into a good PhD program, and helps you figure out what you even want to do.
Best of luck – ignore the pull of prestige and focus on fit and finances.