Question

description
after _______________, the two
pyruvate molecules lose a carbon
atom and are transformed into a waste
product of _________________ (this is a
gas) and two _____________________.

finally, the acetaldehyde receives a
________________ atom from nadh
resulting in the production of two
_________________________.

Explanation:

This describes alcoholic fermentation, a step in anaerobic respiration. First, pyruvate is processed by decarboxylation: it loses a carbon as carbon dioxide, forming acetaldehyde. Then, acetaldehyde accepts hydrogen from NADH to form ethanol, regenerating NAD+.

Answer:

After glycolysis, the two pyruvate molecules lose a carbon atom and are transformed into a waste product of carbon dioxide (CO₂) (this is a gas) and two acetaldehyde molecules.
Finally, the acetaldehyde receives a hydrogen (H) atom from NADH resulting in the production of two ethanol molecules.