Which of the following describes a mechanism that eukaryotic organisms can employ to alter protein production as an alternative to regulating transcription initiation?
A. Catabolite repression plays a role in the synthesis of proteins that break down alternatives to glucose-if the substrate is not present, the proteins will not be made.
B. During times of cell starvation, the second messenger ppGpp destabilizes the DNA open complexes that code for rRNA and tRNA, saving energy by halting protein synthesis.
C. RNA molecules within the spliceosome can direct alternative splicing of the primary transcript so that different proteins can be made from the same coding region.
D. A phosphorelay signal transduction mechanism directs the repression or induction of certain eukaryotic genes to regulate the protein end-products.
Answer: C
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