In every interview you're going to get a chance at the end of the interview to ask a question. You ought not to be using that time to gather information about the company. You're there to sell yourself. After you get the offer, you can always turn it down if the company is not right. Instead, use that time to bring out anything about your background that the interview has not already covered.
Questions are extremely important.
They show interest, they show that you did your homework. I tend to tell our folks to come up with one or two questions that they do on research. Do your homework, read up about the company, especially the most recent articles written about the company. Ask questions that typically can't be answered by their corporate literature. If a corporate literature piece talks about career path, you don't want to be redundant and ask the question that's already answered for you.