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.
-You argue with one of your fellow students that other features of the protein suggest that the protein is much like EGF. To discredit this, you would show the data obtained with

A) amino acid phosphorylation.
B) tyrosine kinase inhibition studies.
C) radioactive XFF.
D) binding assay.
E) use of nonhydrolyzable GTP analogs.