Organisms derive the majority of their energy from the Kreb's Cycle, also known as the TCA cycle. The Kreb's Cycle is an aerobic process consisting of eight definite steps. In order to enter the Kreb's Cycle pyruvate must first be converted into Acetyl-CoA by pyruvate dehydrogenase complex found in the mitochondria.

Kreb Cycle (Citric Acid Cycle, or TCA cycle (tricarboxylic acid cycle)), is a central metabolic pathway where the sequence of biochemical reactions releases energy stored in the form of ATP. The Krebs Cycle takes place in the mitochondria. The Krebs Cycle was discovered by Hans Krebs. The cycle starts with

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The Krebs cycle is a series of redox reactions each catalysed by an enzyme. Firstly, acetyl coA enters the cycle by combining with a 4-carbon compound (called oxaloacetate) to produce a 6-carbon compound (called citrate).