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

Question

Quizplus · Accepted Answer

If protein synthesis is blocked, the "greening" process, which involves the development of chlorophyll and the initiation of photosynthesis, cannot rely on the synthesis of new proteins. Therefore, the modification of existing proteins through post-translational modifications would be necessary to initiate any changes required for greening. Reception of light by phytochrome, activation of protein kinases by cAMP or Ca2+, and changes in Ca2+ levels typically involve signaling pathways that lead to the synthesis of new proteins, which would not be possible in this scenario.

If Protein Synthesis Was Blocked in Etiolated Cells, What Would