Is it possible to tell the resolution of images in a PDF?

I'm curious if there's a way to figure out what resolution the photographs in a PDF are saved at. I receive lots of ads from different designers. Occasionally some designer has used a low-res image in an ad, but I don't find this out until I get the prepress report. Is there another way to tell? My little desktop printer isn't too reliable for figuring out this kind of stuff, and I can't always tell from the filesize in a PDF (like I could with a JPEG).
Thanks, Phyllis

Pretty complicated stuff. Where do I look for the image resolution? I thought the Display Alerts would show that, but it doesn't seem to be the case. I have a long list of Preflight Profiles I can mess with, but it doesn't seem to say much about resolution. Any tips? Know any tutorials or anything on this?
Thanks, Phyllis

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