I would not assume up front that not asking any questions in a response indicates no interest. Others have specified several good reasons why somebody might neglect to ask any. If somebody makes a habit of not asking any questions over two or three emails, then I would be more concerned about lack of interest. (In fact, because I am unfailingly polite about answering emails and also non-confrontational about expressing disinterest, this is precisely what I will do when I am not interested in somebody -- answer questions, but not promote further conversation.)

It bears mentioning, however, that after receiving one email with no questions prompting further response, I'll make sure that my next email contains an explicit invitation like, "Is there anything else you'd particularly like to know about me?"

It may not be true but I get the same feeling when that happens.
Then I back off and then if I don't hear from them - I know it's true

I think your right I think the same

Ive encountered this as well.......it was all about mememememeeeeeeeeeeee!!!! Im like wtf?? dont you want to know about me or is it just about you????

your right, some people don't know how to start a conversation out or just shy. we can't tell by just one or two emails. over all, some are just better at it then others

drop ten and punt?