Krebs cycle

The Krebs cycle (named after Hans Krebs) is a part of cellular respiration. Its other names are the citric acid cycle, and the tricarboxylic acid cycle (TCA cycle).

The "Krebs cycle" is a series of chemical reactions used by all aerobic organisms in their energy conversion processes. It is important to many biochemical pathways. This suggests that it was one of the earliest parts of cellular metabolism to evolve.^[1]

The Krebs cycle comes after the link reaction and provides the hydrogen and electrons needed for the electron transport chain. It takes place inside mitochondria.

1. ↑ Lane, Nick (2009). Life ascending: the ten great inventions of evolution. New York: Norton. ISBN 978-0-393-06596-1.