Question Video: Recalling the Products of Glycolysis | Nagwa Question Video: Recalling the Products of Glycolysis | Nagwa

Question Video: Recalling the Products of Glycolysis Biology • Second Year of Secondary School

What 3-carbon compound is the final product of glycolysis?

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Video Transcript

What three-carbon compound is the final product of glycolysis? (A) Glyceraldehyde 3-phosphate, (B) 3-PGA, (C) NAD+, (D) glucose, or (E) pyruvate.

Aerobic cellular respiration is the primary method by which plant and animal cells extract energy from sugars. The first step in this process is called glycolysis. The main reactant of this reaction is glucose, a simple six-carbon sugar. The products of glycolysis include two three-carbon molecules. Let’s take a look at the answers and determine which correctly names this molecule.

First, we can eliminate all of the answers that are not three-carbon molecules. We know glucose is a six-carbon molecule and is the reactant of glycolysis, so we can eliminate answer (D). NAD contains many more carbons than three, so answer (C) can be eliminated. Now let’s discuss answer (A). Glyceraldehyde 3-phosphate is a three-carbon molecule that occurs as an intermediate in glycolysis. It contains an additional phosphate group that the final product of glycolysis does not have. So this answer is also incorrect because it is an intermediate and we are looking for the final product of glycolysis. 3-PGA is the conjugate of glyceraldehyde 3-phosphate, so answer (B) can be eliminated.

The correct answer is (E). The three-carbon molecule that is the final product of glycolysis is pyruvate.

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