Glycolysis and gluconeogenesis are opposed 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?
1) because not every intermediate or enzyme participates in both pathways, conditions will dictate which pathway is stimulated while the other is inhibited.
2) levels of atp will dictate which pathway is operational.
3) both pathways make use of substrate cycles.
only 1 and 2 are correct.
only 1 and 3 are correct.
only 2 and 3 are correct.
all three statements are correct.