What is the difference between citric acid and Krebs cycle?

Answer 1

The major difference in both is that,glyoxylate cycle occurs in glyoxysome of germinating plants while TCA occurs in the mitochondria of animals. Glyoxylate cycle involves 5 steps,while TCA involves 8 steps. The enzyme isocitrate lyase,converts isocitrate to alpha-ketoglutarate in TCA cylce,but in glyoxylate cycle,it converts isocitrate to succinate and glyoxylate,where the name camr from.

Answer 2

Glycolysis:

Glycolysis involves the breaking down of glucose molecules from carbohydrates into molecules of pyruvate, which will continue on to the Krebs Cycle. This process occurs in the cytosol of the cell and can proceed regardless of the presence of oxygen. In the first stage of glycolysis, energy is actually used to phosphorylate the 6-carbon glucose molecule. This means that a phosphate is taken from ATP (which becomes ADP) and added to the glucose molecule. This addition of phosphate makes the molecule much more chemically reactive. The position of the glucose molecule is changed, so that it becomes its isomer, fructose. An enzyme then cuts the molecule apart, producing two 3-carbon molecules of pyruvate. Through several more steps, catalyzed by several different enzymes, the phosphate groups are removed and these pyruvate molecules are ready to enter the Krebs Cycle. The reactions of glycolysis produces a net gain of 2 ATP molecules, as well as a release of 2 water molecules and 2 NADH molecules (these are another type of energy-rich molecule)

The Krebs Cycle:

As pyruvate is being shuttled from the cytosol to the interior of the mitochondrion, a microenzyme removes one carbon and two oxygens from each molecule, producing Aceytl CoA. This two-carbon sugar that actually enters the Krebs Cycle. The Krebs Cycle is a series of steps, catalyzed by enzymes, which completely oxidize the Aceytl CoA molecule. The Krebs Cycle is an aerobic process, meaning it needs oxygen to function. Two complete turns of the Krebs Cycle must occur to produce: 4 carbon dioxide molecules, 6 NADH molecules, 2 ATP molecules and 2 FADH2 molecules (yet another energy-yielding molecule).

The Electron Transport Chain:

Very little energy has been produced during glycolysis and the Krebs Cycle. Most of the energy locked in the original glucose molecule will be released by the electron transport chain and oxidative phosphorylation. The electron transport chain is a network of electron-carrying proteins located in the inner membrane of the mitochondrion. These proteins transfer electrons from one to another, down the chain, much in the way a bucket brigade passes buckets of water. These electrons will eventually be added, along with protons, to oxygen, which is the final electron acceptor. This produces water, but does not produce any ATP. The ATP is actually produced by a proton motive force. This force is a store of potential energy created by the gradient formed when hydrogens (protons) are moved across a biological membrane. Therefore, the electron transport chain merely produces a gradient through which ATP can be made (this is known as chemiosmosis). The electron transport chain produces the remaining 32-34 ATP.

Answer 3

Pyruvate, the three carbon sugar molecule from the break-down of glucose, releases one carbon atom. The released carbon atom reacts with an oxygen molecule, forming a carbon dioxide. The energy, which is release as the carbon atom left the pyruvate, is used for the reduction of NAD to NADH (coenzymes, needed later at the electron transport chain).

The remaining two carbon atoms react with coenzyme A (CoA) --- forming acetyl-CoA, which then enters the Citric Acid (or Krebs) Cycle.

Answer 4

Glycolysis makes oxygen and Krebs cycle doesnt

Answer 5

Glycolysis uses oxygen

The Krebs cycle does not use oxygen

Answer 6

No DIfference....