

The problem with dark matter is that we don’t know what it is. If it’s a particle, then presumably there probably would be an antiparticle for it. However, we don’t actually know if it’s a particle or not.
There’s some hypotheses that say that dark matter doesn’t physically exist, and that our theories of gravity are just incomplete. There’s some other hypotheses that say that dark matter might be really small black holes. And then there’s some hypotheses that say that dark matter is a particle. Until we find out more about what it is, we simply can’t say for sure what sorts of properties it has
Lots in biology research, since biologists tend not to be good coders. That being said, the requirements for biology are rather interdisciplinary and a serious position will likely require you to also have advanced biological knowledge. Based on my impressions, you’ll basically be playing biologist for 50% of the time and programmer for the other 50%.