The Krebs cycle runs twice to break down one molecule of glucose.
For each molecule of glucose consumed, the Krebs cycle (also known as the citric acid cycle) occurs twice. This is because one glucose molecule is broken down into two molecules of pyruvate during glycolysis, and each pyruvate is then converted into acetyl-CoA, which enters the Krebs cycle. Thus, for every glucose molecule, the cycle runs twice, producing energy carriers such as NADH and FADH2.
One glucose molecule undergoes glycolysis, which breaks it down into two molecules of pyruvate. Each pyruvate then enters the Krebs cycle (or citric acid cycle), where it is fully oxidized. Since each glucose results in two pyruvate molecules, two cycles of the Krebs cycle occur per glucose molecule, leading to the production of CO2 as a byproduct in each cycle. Therefore, a total of six CO2 molecules are generated from one glucose molecule after two Krebs cycles.
The Krebs cycle is a series of chemical reactions that occur within the process of cellular respiration. It is the second stage of cellular respiration and takes place in the mitochondria of eukaryotic cells. The Krebs cycle helps break down pyruvate (from glycolysis) into carbon dioxide, generating ATP and high-energy electrons in the process.
In the mitrochondria!
The Krebs cycle occurs in the mitochondrial matrix of the cell.The kreb cycle takes place in the matrix of the mitochondria.
twice
One glucose molecule undergoes glycolysis, which breaks it down into two molecules of pyruvate. Each pyruvate then enters the Krebs cycle (or citric acid cycle), where it is fully oxidized. Since each glucose results in two pyruvate molecules, two cycles of the Krebs cycle occur per glucose molecule, leading to the production of CO2 as a byproduct in each cycle. Therefore, a total of six CO2 molecules are generated from one glucose molecule after two Krebs cycles.
The Krebs cycle is a series of chemical reactions that occur within the process of cellular respiration. It is the second stage of cellular respiration and takes place in the mitochondria of eukaryotic cells. The Krebs cycle helps break down pyruvate (from glycolysis) into carbon dioxide, generating ATP and high-energy electrons in the process.
Kreb's cycle is part of cellular respiration, it needs nothing but oxygen and glucose. Only photosynthesis needs light.
The molecule you are referring to is NAD+ (nicotinamide adenine dinucleotide). It acts as a coenzyme electron carrier in the Krebs cycle by accepting and donating electrons during the oxidation-reduction reactions that occur in the cycle.
In the mitrochondria!
if fermentation occurs.
Mitochondria
The Krebs cycle generates approximately 30 ATP molecules per glucose molecule respired.The actual number varies, because varying amounts of energy are diverted into other processes than ATP synthesis.For a discussion of some of the issues, visit:http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/C/CellularRespiration.html#citric_acid
The Krebs cycle is an aerobic process, meaning it requires oxygen to occur.
The Krebs cycle occurs in the mitochondrial matrix of the cell.The kreb cycle takes place in the matrix of the mitochondria.
The Krebs cycle is also called the citric acid cycle.