Question

The electrons formed from the aerobic oxidation of glucose are

I. ultimately transferred to O 2 after several other transfer reactions
II. transferred to the coenzymes NAD+ and FAD
III. directly transferred to O 2 during the citric acid cycle
IV. transferred to succinate and arachidonic acid

Answer 1

I. Ultimately transferred to O2 after several other transfer reactions

Step-by-step explanation:

Electrons form glucose oxidation are first taken out from glucose in glycolysis, by NAD+, that is reduced to NADH.

Also NADH is produced when pyruvate (glycolysis product) is decarboxylated and oxidized to acetyl-coenzyme A, previous to enter the Krebs cycle.

In the Krebs cycle, electrons form oxidation of citric acid first, and alpha keto-glutarate later are taken by NAD+, and stored as NADH. Steps later also FAD accepts electrons to produce FADH2. These molecules will deliver these electrons to a respiratory chain, where they will travel until be accepted by O2 to form H2O (some protons are also necessary).