I was a music major, so needless to say, I had absolutely nothing that carried over from my previous degree to a nursing degree. However, to my knowledge, colleges will waive the typical undergrad work that you would need for 2nd degree seeking students (meaning your English, Computer, History, Humanities, etc. classes). You just have to have the prereqs for the nursing major. So, if I wasn't working full time, getting the BSN would probably only take me 3 years WITH the prereqs (1 year of prereq work and 2 years of Nurse courses). But, I am working and taking classes, so I've been pecking away at my prereqs slowly (by the time it's all over with it will have taken me 2 summer sessions and 3 full sessions to complete my prereqs with about 8 course hours each semester) and will be done with all of them at the end of the upcoming Fall semester. Therefore, it is essentially taking me 4 years to get another BSN and it would have taken me 3 1/2 to get an associates. Hopefully that makes sense.
The thing that really sucks about these colleges is that they all seem to want different prereqs - at least where I'm at. And, as most of us have probably realized, it's very competitive as they typically only seem to offer about 50 openings each semester (100 new nursing students per year), and for the ABSN programs it's more like 30 per year. So, I've had to create myself a spreadsheet with all of the courses that I need from each college, line up when I will have them all done, and apply for all of them at the same time and just hope that I get in to the BSN program and won't have wasted money and time taking prereqs that aren't needed.
In my experience, I've found that both programs want Micro, A&P I/II, College Algebra, Intro to Chem or HS Chem (I haven't had either of these yet).
On top of that, the BSN programs seem to want Nutrition, Developmental Psych, General Psych, Sociology and Statistics.
The difference with the BSN versus ABSN is that 1. the ABSN will go through the summer and BSN will not offer Nurse courses during the summer and 2. the ABSN will have you taking about 21 credits per semester versus about 15-17 for BSN. I don't know if you've ever taken 21 hours, but I did it for 3 semesters of my first college career and was burnt out, needless to say. It's like working a full time job with school on top of it pretty much. That's not to say that it can't be done. But it's like the advisor said, you have to put everything else in your life onhold. And I'm sure it's even harder when it's nursing school versus a music degree!
I don't know if you've tried to register for any of the Biology classes, but it took me a year at my local community college until I could finally get in to one of them (this is when I got priority enrollment).
Hope that helps a bit.