Base Your Answers to the Questions Below on the Following

Multiple Choice

Base your answers to the questions below on the following information:
You have isolated a factor from the blood of a space alien and named it XFF (for X- files factor) . Based on preliminary data, you think that XFF could be one of three compounds normally found in human blood: epidermal growth factor (EGF) , epinephrine, or estrogen.
-After determining which preparation contained the XFF receptor, you wish to determine the properties of the ligand receptor. Using a radioactive XFF, you wish to determine if the properties are similar to that of epinephrine and the epinephrine receptor. If so, you expect to find the radioactive XFF

A) associated with mitochondria.
B) in the nucleus.
C) associated with the ER.
D) on the cell surface.
E) within the cell.