volume_mute
Where the Hydrogen Comes From
publish date: 2026/06/20 10:12:17.846288 UTC
Without oxygen, pyruvate accepts hydrogen from (1), which frees more NAD to accept hydrogen in other glycolytic reactions.
Please drag and drop the selected option in the right place or type it instead
acetyl-CoA
ADP
ATP
NADH2
Correct Answer
(1) NADH2
Explanation
NADH2 donates hydrogen to pyruvate during fermentation. This regenerates NAD+, which is then free to pick up more hydrogen atoms in earlier steps of glycolysis, allowing the pathway to keep running even without oxygen.
Reference
Biology: A self-teaching guide