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In aerobic respiration of glucose in eukaryotes, two molecules of pyruvic acid is produced in the cytoplasm by glycolysis of one molecule of glucose. The pyruvic acid then enters the mitochondria to go through the Krebs cycle, which will break down the pyruvic acid into carbon dioxide, which is then excreted. Putting a molecule of pyruvic acid through the Krebs cycle yields 1 molecule of ATP (2 ATP per glucose), but importing the pyruvic acid into the mitochondria costs 1 ATP molecule, so the net gain of ATP from the Krebs cycle is +0.
Hydrogen ions and high-energy electrons from glycolysis also need to be imported into the mitochondria to the electron transport chain, which is where the mother-lode of ATP comes from (34 ATP per glucose molecule).
Other molecules such as fatty acids and amino acids typically don't undergo glycolysis, but instead are imported directly into the mitochondria where they enter the Krebs cycle somewhere depending on their molecular structure.
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∙ 13y ago
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∙ 14y agoPyruvate
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Where is anaerobic respiration take place?
The reactions of anaerobic respiration take place in the cytoplasm.
What happens to glucose after it enters the cell?
There are three main uses of the glucose made by photosynthesis:1) It can be used as a source of energy (in respiration)2) It can be converted into starch and stored3) It can be converted into other substances eg cellulose, fats, proteins etc.
What process do mitochondria use to release energy from glucose using oxygen?
The mitochondria is not responsible for the breakdown of glucose, but this actually occurs starting in the cytoplasm via glycolosis. Glycolosis breaks down glucose to pyruvate, which enters the mitochondria and is broken down to Carbon dioxide via the Citric Acid Cycle (a.k.a. the Kreb cycle). The reduced agents produced from here donate their electrons to the electron transport chain, with the final electron acceptor being Oxygen. The electron transport chain pump hydrogen atoms from the inner matrix to the outer region in the mitochondria as these electrons move down the chain. This hydrogen gradient is used to create ATP much like a dam creates electricity from water. Sources differ on how many ATP are created per molecule, but on average it is 2.5 moles of ATP per mole of NADH, and 1.5 moles of ATP per mole of FADH2.
What stages of cellular respiration occur in mitochondria?
Glycolysis is the first stage of cellular respiration, but it is in the cytosol that a series of reactions happen and glucose is broken down into 2 pyruvates. When these enter the mitochondrion through active transport (transport proteins), the pyruvate binds with Coenzyme A to become acetyl CoA which then enters the citric acid cycle. So the citric acid cycle, specifically the acetyl CoA attaching to the 4-carbon molecule oxaloacetate is the first stage of cellular respiration that occurs in the mitochondria. Check.
Most carbon enters the web of life through what?
Carbon enters into livings systems differently, depending on the organism. With plants, carbon primarily enters as carbon dioxide during photosynthesis . In animals carbon is taken up through food.
Where does cellular respiration occur and in what organelle?
Cellular respiration starts in the cytoplasm of the cell, and then enters the mitochondria.
When oxygen is present what porduct enters the second stage of cellular respiration?
Mitochondria
Where is anaerobic respiration take place?
The reactions of anaerobic respiration take place in the cytoplasm.
Where does the produced pyruvate go in the second stage of cellular respiration?
Pyruvate enters mitochondria for further stages of cellular respiration such as Kreb's cycle and ETC.
Why is the mitochondria the site of aerobic cellular respiration?
All the enzymes required for the aerobic respiration(respiration requiring oxygen) are present in mitochondria,thus it always takes place in mitochondria.However,anaerobic respiration takes place in the cytoplasm of cell because all the required enzymes are present in cytoplasm
Where does respiration start?
Respiration starts at the nose and mouth. This is because it is where the oxygen first enters the body in order to be processed.
What process respiration happens first?
During respiration, oxygen that enters the stomata caused the chemical breakdown of glucose into carbon dioxide and water. This releases energy that plants need for their life activities.. respiration is the energy-releasing process.
What process in respiration happens first?
During respiration, oxygen that enters the stomata caused the chemical breakdown of glucose into carbon dioxide and water. This releases energy that plants need for their life activities.. respiration is the energy-releasing process.
What is the energy input for the mitochondria?
The energy of a mitochondria is called a ATP.
How does carbon enters the biotic part of the biosphere?
respiration
What structures are common to both pant cells and animal cells?
Both: mitochondria, golgi bodies, rough/smooth endoplasmic reticulum, cytoplasm,cell membrane, lysosomes, nucleus, ribosomes, nucleolus, Plants: cell wall, chloroplasts, large central vacuole Animal: Centrioles
What happens when pyrvuate enters the mitochondria?
They are turned into acetyl co-A.Finally into two CO2 molecules.
