While studying a protein synthesized by human liver cells, you notice a correlation between stress and decreased levels of this protein. Initially, you hypothesized that stress caused phosphorylation of eIF-2, and a commensurate reduction in protein synthesis, but further investigation revealed that the rate of synthesis of this protein had not changed—there simply was not as much within the cells as expected, nor was the protein being secreted by the cells. What possible explanation remains?
a. Stress alters the protein structure making it undetectable.
b. Stress weakens the polypeptide bonds in this protein.
c. Stress causes ubiquitin to bond to the protein.
d. Stress causes eIF-2 to hydrolyze the protein.
c. Stress causes ubiquitin to bond to the protein.
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