Section 2
Glycolysis
Book
Version 32
By Boundless
By Boundless
Boundless Biology
Biology
by Boundless
4 concepts
![Thumbnail](../../../../../../figures.boundless-cdn.com/20511/square/cellular-20respiration.jpeg)
Importance of Glycolysis
Glycolysis is the first step in the breakdown of glucose to extract energy for cellular metabolism.
![Thumbnail](../../../../../../figures.boundless-cdn.com/18834/square/figure-07-02-01.jpeg)
The Energy-Requiring Steps of Glycolysis
In the first half of glycolysis, energy in the form of two ATP molecules is required to transform glucose into two three-carbon molecules.
![Thumbnail](../../../../../../figures.boundless-cdn.com/18835/square/figure-07-02-02.jpeg)
The Energy-Releasing Steps of Glycolysis
In the second half of glycolysis, energy is released in the form of 4 ATP molecules and 2 NADH molecules.
![Thumbnail](../../../../../../figures.boundless-cdn.com/6034/square/c6-28d8-4f29-b350-9afd26fc6d34.jpg)
Outcomes of Glycolysis
One glucose molecule produces four ATP, two NADH, and two pyruvate molecules during glycolysis.