First, I would like to address the topic of obtaining more professional Biologist. I recently came back from a trip to Georgia, US. My flight coincided with the Experimental Biology Conference 2015 in Boston, MA, US. On this flight, there was about 50 attendees and something like 6000+ scientists will be attending and presenting. Myself and Anne were seated next to one of the attendees a 5th year PhD student. We started talking to her and later asked if she was aware of Bio.SE. The answer was never heard of such a think, and in fact, she never heard of SE. She thought the site sounded great and none of the other attendees in our vicinity new about SE (about 10 people). We told them about the site but I doubt they will join. They were nice, but to me, they didn't have attitude or drive of someone who would later look up the site and join. I could be wrong though.
This interaction had me thinking. In mathematics, many students, even non SE users, know of SE. Why is this? One reason I could think of is that when you google a math problem, you will get hits from universities and hits from SE, physicsforum, and mathhelpboards at the top all forums designed as Q&A. Therefore, math students become familiar early on about these sites and turn to them as lurkers or participants.
What can we do about this? Or more like what can professional Biologist do since I am not one. By professional, I mean post docs, PhDs, and graduate research biologist. They should attend these conference and socialize. Get emails, Facebook, LinkedIn, etc. Once you make that connection, introduce them to the site. Create a Bio.SE shirt to ware at this conferences. The shirt alone should start conversations.
As for the voting anomaly of basic question, that happens on every SE site. My hypothesis is that higher rep user upvote answers less often. Not sure why though. For awhile, SO had the stigma of being very unhelpful and inclusive of new and inexperienced members since they (established users) only knew one thing downvote. However, after numerous meta debates, they are trying to be better. I doubt Bio.SE wants to follow that path. However, TeX.SE, to me, is about the positive of all SE since downvotes are seldom and upvotes are plentiful but that is the environment they want. The top users carry the most influence and since they upvote many good questions and answers new user learn to do so as well. If this is he environment Bio.SE wants to foster, the influential users need to take a proactive approach to lead the upvoting way. Communities are like business. Everyone learns and takes the lead from their boss. If the boss is positive, hard working, and friendly, the employees will be to since that is who they look to. If the boss is not, well we have all being in contact with a company where the employees don't care and the environment is bad. Besides the two extremes there is indifferent not taking a stand either way; that is, not voting often and early and new members see that too.