What does a typical Cap Markets Analyst do?

I recently had a first-round for Morgan Stanley GCM division and was asked the above question.

I kinda bs'd my way through it and said something along the lines of "need to know how to make pitch decks, models, work with others and generally make your bosses lives easier."

Just got the superday and I have an inkling they are gonna ask me this again, does anyone have any advice on what they are looking for here? Thanks.