<prompt> If a radioimmunoassay is properly conducted and the amount of radioactive hormone bound to antibody is low, what would this result indicate?Plasma levels of endogenous hormone are highPlasma levels of endogenous hormone are lowMore antibody is neededLess radioactive hormone is needed  <response>: In a radioimmunoassay, there is too little antibody to completely bind the radioactively tagged hormone and the hormone in the fluid plasma to be assayed. Thus, there is competition between the labeled and endogenous hormone for binding sites on the antibody. Consequently, if the amount of radioactive hormone bound to antibody is low, this finding would indicate that plasma levels of endogenous hormone are high 