I spent a summer in the molecular biology department. It's really difficult to get published in just one summer since research worthy of publication takes a lot of time and effort, but my brother did manage to get his name on a publication but he was like 5th or 6th author. So I wouldnt go into it expecting a 1st of 2nd authorship.
The normal day was typically working 9-5. In between running experiments people usually sit and read journals and 1 time a week we would have a journal review. Once a month someone would present their research to the group. But of course this routine will vary between labs.
I really enjoyed my time there and learned a ton. MD Anderson is an amazing hospital and the TMC is equally if not even more impressive.
Only negative was the heat and the pay(stipend = broke).
Tooth
