If Protein Synthesis Was Blocked in Etiolated Cells, What Would

Multiple Choice

If protein synthesis was blocked in etiolated cells, what would be necessary for the "greening" of these cells?

A) reception of light by phytochrome
B) activation of protein kinase 1 by cAMP
C) activation of protein kinase 2 by Ca²⁺
D) post-translational modification of existing proteins
E) 100-fold decrease in cytosolic Ca²⁺ levels