Answer:
Answers to the (B) Part
1. A
2. D
3. B
Explanation:
Explanation of the (A) Part
a.
G-3-P, also known as Glyceraldehyde-3-Phozphate.
In the dehydrogenase process of G-3-P, phosphate is a compulsory requirement.
During this process, the G-3-P is hereby changed or converted into 1,3-bisphosphoglycerate in presence of NAD+ and Pi. Note that the exhaustion of Pi signal the end of the glycolysis process.
Because there's is glucose in abundance (excess), the glucose is thus, phosphorylated to ATP but no Pi gets released.
b.
During fermentation, CO₂ and Ethanol are produced. But if there's no fermentation of ethanol in the absence of oxygen (anaerobic condition) , the NADP+ will piled up.. So, no new NAD+ would be available for further glycolysis.
Pyruvate is converted to ethanol and CO2 to replenish NAD+ for glycolysis to proceed.
c.
The hexose phosphate is piled up or accumulated to fructose 1, 6 bisphosphate.
The point between the energy input reaction preceding it and the energy forming reaction after it serves as the intermediary of the reaction.
Because of unavailability of P, G-3-P is not broken down. Hence, the reaction will backflow to fructose 1, 6 bisphosphate, which is more stable.