Glycolysis and gluconeogenesis are opposing pathways in that they begin or end with the same metabolites and share common intermediates and/or enzymes. yet, for energetic reasons, the two processes cannot be the exact reverse of each other. how is this possible? a. because not every intermediate or enzyme participates in both pathways, conditions will dictate which pathway is stimulated while the other is inhibited. b. levels of atp will dictate which pathway is operational. c. both pathways make use of substrate cycles.

Atp is is our little "pocket" of energy. of course, if you have too little, then it means you have too little energy, and you'll pass out. the way to not have enough, is to have no energy sources (glucose, fats, proteins). you can't have too many atp molecules. cycles like the krebs cycle produce it, but if you have too much of any substrate (or too little for that matter), the cycle stops and atp is no longer made (it stops until substrate levels are such that the process can go on). in any case, this is unlikely since atp is constantly hydrolyzed and remade, even while you're asleep. you won't have too much. if you have zero, you are dead or dying.

Exposure to solar flares would be the correct answer