lol, do not be overwhelmed by the 1st day of class, i dont even remember talking about the functions and types of RNAs in genetics, this was probably just a brief overview of stuff but trust that you probably won't get a long answer question about it on the test. remember that her tests are extremely fair and also keep in mind that tests take place in 50 mins and its a genetics class so it tests genetics concepts which are not difficult.
when it comes to the exam, however, well thats a different story.
but no sweat, Dr. Dej is awesome and things will get better!
Good luck!