I'm currently a student in the molecular bio faculty, but the topics that are introduced to us right now are pretty scarce, enzymology, proteomics, molecular physiology, etc. and none of them actually goes into great details to get me interested in a particular field... is it because molecular bio is a generalized name for all these categories and that I have to choose one of the streams after I graduate in order to continue studying under this field?

What you can do with molecular biology differs from nation to nation in some degree. However the people I know with degrees in molecular biology mainly work in hospitals or research institutes and their job is mainly research.

 

Although specializing in a sub-category of molecular biology is definitely worth it, it's more important to know a lot about all different categories. I know a molecular biologist who specialized in a technique and knew everything about that. Till a better technique was discovered and he basically got downgraded a lot.