4
There are four carbons in a molecule of malate at the end of the Krebs cycle.
Energy is released.
The Krebs Cycle, also known as the citric acid cycle, consists of a series of chemical reactions that occur in the mitochondria. Its components include citrate, isocitrate, alpha-ketoglutarate, succinyl-CoA, succinate, fumarate, malate, and oxaloacetate. These reactions ultimately lead to the production of energy in the form of ATP.
oxaloacetic acid
carbon dioxide and the Krebs cycle
A byproduct of the krebs cycle/citric acid cycle is carbon dioxide.
Carbon dioxide (CO2) is a byproduct of the Krebs cycle. It is produced during the decarboxylation reactions that occur within the cycle, where carbon atoms are removed from molecules like citric acid.
Water molecules are not directly produced in the Krebs cycle. However, water is a byproduct of the overall process of cellular respiration, which includes the Krebs cycle along with glycolysis and the electron transport chain.
The net gain of carbon atoms in the Krebs cycle is zero. Although acetyl-CoA enters the cycle as a 2-carbon molecule, it ultimately combines with oxaloacetate (a 4-carbon molecule) to form citrate (a 6-carbon molecule), which is then oxidized back to oxaloacetate. This means that the total number of carbon atoms remains constant throughout the cycle.
Citric acid cycle
It's called the Krebs's cycle and it consists of the steps to convert a 2 carbon sugar into CO2 and H2O. (And you don't own the genetic code to do this ... only the mitochondria do.)
Carbon Dioxide is produced during the Kreb cycle (also called the citric acid cycle).