Genna is describing an experimental result in which a metabotropic receptor activated multiple proteins. Genna is describing a(n):

Amplification cascade

Explanation:

Amplification cascade also known as Signaling pathway occurs when a stimulus or first messenger prompts a biological reaction within a cell which in turn acts on a receptor that undergoes signal transduction and amplification caused by secondary messengers. These secondary messengers send the signal to the effector sites who now produce a response to the initial stimuli.

So, the basic principle of an amplification cascade is the fact that a particular action triggers the response of several other factors. This is similar to what Genna describes in her experiment where a metabotropic receptor activated multiple proteins.

both anaerobic and aerobic respiration use glucose (or other carbohydrates), proteins and lipids to produce atp and nadh. cell uses those energy molecules, obtained from food and   breaks them down during the chemical reactions of respiration. in anaerobic respiration, nadh is regenerated to nad+ by enzymes lactate dehydrogenase (lactate is produced, e.g. in muscle cells) or by alcohol dehydrogenase where ethanol is produced (alcohol fermentation), while in aerobic respiration, electrons from nadh are deposited in the mitochondria to regenerate nad+ (electron transport chain. anaerobic respiration produces 2 atp per molecule of glucose compared to aerobic respiration where about 38 atp molecules are produced.