Remember that biopsies are taken for any number of reasons. In this case they are probably checking for a bacteria that causes acid reflux and some stomach ulcers H-pilori (sp butchered I am sure). It is always difficult waiting for biopsy results. Try not too worry too much. You always have the right to call the doctor and ask what he is looking for in the biopsies.
Most of the time if there is a colonoscopy or endoscopy done due to other issues besides normal/routine, they will take biopsies to make sure there is no infections or anything else going on that could need treatment.
Since they are already in there, they want to get as much as they can, so they dont have to put you under and do it again.