I am sorry, where are you getting your information from? I have an aunt who went straight to medical school after her BS to get her PhD. Never obtained her Masters.
I have a masters degree in biology - similar to what you want to get into. "Medical school" is not a masters program in my books. Yes you can enter medical school from a BS (I never said you couldn't), but you never mentioned medical school in your original post -- if you did, it's not there anymore.
There are SEVERAL schools where you can apply to obtain your PhD WITH OUT obtaining a Masters. For instance here is Harvard's requirements below.
http://www.hms.harvard.ed...ospective/Admissions.html
Then, I hate to say it, but those schools are setting their students up for failure. Ivy league schools are totally different that normal universities. They set their students up really well after an undergraduate degree, since they only accept the most qualified/gifted high school students to enroll in the first place. I don't speak for all schools, but where I come from, and from whom I've spoken to, befriended, and acknowledged through experience, a masters program leads to a PhD program in research.
For your information you CAN obtain a 6 figure (100K PLUS) a year. Granted, it might be a few years POST doctoral however you can obtain it.
Okay, and who is going to pay you? Why are you being ignorant to my original post? I mentioned that there is no way in hell you'll make six figure if you don't have a job. Employers look for people who are most skilled and passionate. If money drives you and you have no passion, you'll be working at Starbucks for $10.50 an hour.
A simply click on glassdoor.com (this site posts job salaries) or heck even monster or career builder will show you a Research Scientist salary
According to that website, I should be making $55.60 an hour. Sadly, I don't make close to it.