Final answer:
Fructose 2,6-bisphosphate is the allosteric activator that increases the activity of fructose 1,6-bisphosphatase, a key enzyme in gluconeogenesis.
Step-by-step explanation:
The conversion of fructose 1,6-bisphosphate is a crucial step in gluconeogenesis, which is catalyzed by the enzyme fructose 1,6-bisphosphatase. An allosteric activator of this enzyme plays a significant role in regulating this metabolic pathway. The allosteric activator in question is d) Fructose 2,6-bisphosphate. This molecule is a potent regulator of gluconeogenesis and glycolysis, as it can positively affect the rate of these processes. Specifically, fructose 2,6-bisphosphate increases the activity of fructose 1,6-bisphosphatase, facilitating gluconeogenesis by promoting the conversion of fructose 1,6-bisphosphate to fructose 6-phosphate and inorganic phosphate.