Refer to the figure showing positive and negative regulation. 
Which system would be more likely to control the transcription of biosynthetic genes, and why?
Definitions:
Electrical Signals
Impulses of electric current that are used for communication within and between nerve cells and muscles in the body.
Responsiveness
The ability of an organism or system to adjust and react to changes or stimuli in its environment.
Respiration
The physiological process of exchanging gases between an organism's cells and its environment, involving oxygen intake and carbon dioxide expulsion.
Digestion
The biological process by which food is broken down into smaller components, eventually to be absorbed into the bloodstream.
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