Doable, but in this economy you really got to prove yourself to get one of those jobs at a top firm. They generally wont hold your major against you if you got the GPA and can rock the case interviews. Other than that I'd recommend doing things to show (and confirm) your interest in business. This can range from taking finance and accounting classes to joining clubs etc. Additionally position yourself in a way that highlights your biology skills, seek out positions that look for people with both a bio and a business background (they exist.) Keep in mind though you are in competition with all of the math, econ, finance, and marketing majors, in your interviews you will be expected to prove to these firms why they should choose you over them. This is not going to be easy, but it can be and has been done.
One last thing, don't expect that a stellar job is going to fall into your lap just because of your Ivy degree, many of my friends made this mistake and are unfortunately now getting burned. The ONLY ones that have jobs now were the people who worked hard, made the grades, and truly earned it.
Best of luck to you in your pursuits 🙂