Would you say these steps accurately/correctly describe what happens in yeast during alcoholic fermentation.
The overall reaction can be described by this equation: C6H12O6 → 2 C2H5OH + 2 CO2. This type of alcoholic fermentation is catalyzed by an enzyme found in the yeast known as Zymase.
1. Sucrose from the dough is broken down by water and the enzyme invertase, into two glucose molecules. (C12H22O11 + H2O → 2 C6H12O6)
2. Then, the process of glycolysis separates each glucose molecule into two pyruvate molecules and other products.
(C6H12O6 + 2 ADP + 2 Pi + 2 NAD+ → 2 CH3COCOO− + 2 ATP + 2 NADH + 2 H2O + 2 H+)
3. Each pyruvate molecule accepts a proton and becomes pyruvic acid, which then is converted into acetaldehyde and carbon dioxide.
(CH3COCOO− + H+ → CH3COCOOH → CH3CHO + CO2)
4. In the process of glycolysis shown above, 2 NAD+ molecules were converted into 2 NADH molecules, they accepted a proton and two electrons. For the process to last, the NADH has to become NAD+ so that it can go through the reaction again and keep separating glucose. "..."
Of these next 2 sentences, which one better describes the final step when acetaldehyde becomes ethanol? It would go right after the last sentence, where the "..." is.
This happens when NADH releases that proton and two electrons, becoming the NAD+ needed to repeat the reaction in step 2, to join acetaldehyde, which in the meantime also accepted a proton (H+) that was produced in step 2, forming ethanol. (CH3CHO + H + e- + H+ → C2H5OH)
This happens when NADH reacts with acetaldehyde, forming NAD+ and a compound that accepts a proton (H+) from step 2 to become ethanol. (CH3CHO + NADH + H+ → NAD+ + C2H5OH)