In which condition are stomach acids pushed into the esophagus?

________ solutions contain the same tonicity concentration as red blood cells

A) Hypotonic B) Hypertonic C) Isotonic D) Ultratonic

Using a capillary tube, a layer of organism suspension is placed over a layer of Group A Streptococcus antiserum. If the two are homologous, a precipitin ring will appear

A) in the area of postzone. B) in the area of prozone. C) in the zone of equivalence. D) throughout the tube.