Cellular Respiration: Krebs Cycle
What is another name for the Krebs Cycle?
The Citric Acid Cycle.
What happens to the Electron Carriers in Energy Extraction?
At 5 places Electron Carriers accept a pair of high-energy electrons, changing NAD+ to NADH, and FAD to FADH2. FAD and FADH2 molecules similar to NAD+ and NADH.
What happens during Energy Extraction?
Citric Acid is broken down into a 4 carbon molecule, more carbon dioxide is released, and electrons are transferred to energy carriers. So 1 carbon atom is removed from the 6 carbon atoms in Citric Acid, and then another is released, releasing 2 molecules of carbon dioxide and leaving a 4 carbon molecule.
What are the Krebs Cycle products?
Electron Carriers (NADH and FADH2), ATP, and Carbon Dioxide.
How does ATP work in Energy Extraction?
For each turn of the cycle, a molecule of ADP is converted to a molecule of ATP and since Glycolysis produces 2 molecules of Pyruvic Acid, each starting molecule of Glucose results in 2 ATP molecules.
Where does the Krebs Cycle occur?
In the Matrix.
Why is the Krebs Cycle a cycle?
It is a cycle because the 4 carbon molecule produced in the last step is the same molecule that accepts the Acetyl-CoA in the first step.
What is Acetyl-CoA made of?
It is made of 2 carbon atoms, 1 oxygen atom, and 3 hydrogen atoms.
What is the Matrix?
It is the innermost compartment of the Mitochondrion.
What are the Electron Carriers in Energy Extraction?
NAD+ and FAD.
What happens during the Krebs Cycle?
Pyruvic Acid is broken down into Carbon Dioxide, in a series of energy extracting reactions.
What happens during Citric Acid Production?
So 1 carbon atom from Pyruvic Acid becomes part of a molecule of carbon dioxide, which gets released to the air. Then the other 2 carbon atoms from Pyruvic Acid, are going to rearrange and form Acetic Acid. The Acetic Acid is joined to a compound called Coenzyme A. The resulting molecule is called Acetyl-CoA then enters the Krebs Cycle. 2 high-energy electrons are passed to NAD+ to produce NADH. Then, the 2 carbons from Acetyl-CoA are added to a 4 carbon molecule that is already present in the cycle, producing a 6 carbon molecule called Citric Acid.
What happens to the Krebs Cycle products?
So Carbon Dioxide is not useful and is expelled through exhaling. ATP molecules are very useful, and become available to power cellular activities. As for Carrier Molecules like NADH, in the presence of Oxygen, the Electrons they hold are used to generate huge amounts of ATP.
What is the Krebs Cycle?
The second stage of Cellular Respiration.
