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File - Principles of Biology 103
File - Principles of Biology 103

... B. Sugar molecules are joined with ATP molecules C. The oxygen backbones of sugars are broken down to make ATP D. The carbon backbones of sugars are broken down to make ATP E. Carbon released from sugars directly drives life-sustaining reactions 2. Four of the five answers listed below are compounds ...
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... Protons are pumped out of the mitochondria by the complexes of the electron transport chain. The proton gradient established during electron transport is a form of potential energy. The electron transport chain can be found in the mitochondria of aerobic bacteria and other cells. The movement of pro ...
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Cellular Respirationx
Cellular Respirationx

...  The pyruvic acid made during glycolysis diffuses through the double membrane and into the mitochondrial matrix. The mitochondrial matrix contains the enzymes needed for the Krebs cycle.  When pyruvic acid enters the mitochondrial matrix, it reacts with a molecule called coenzyme A to form acetyl ...
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Nitrogen Metabolism, Ammonia Degradation and Urea Formation
Nitrogen Metabolism, Ammonia Degradation and Urea Formation

... Urea is the major disposal form of amino groups derived from amino acids. 90% of the nitrogen containing components of urine are urea. The carbon and oxygen of urea are derived from CO2. Urea is produced by the liver, transported in the blood to the kidneys for excretion. ...
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Mitochondrion



The mitochondrion (plural mitochondria) is a double membrane-bound organelle found in most eukaryotic cells. The word mitochondrion comes from the Greek μίτος, mitos, i.e. ""thread"", and χονδρίον, chondrion, i.e. ""granule"" or ""grain-like"".Mitochondria range from 0.5 to 1.0 μm in diameter. A considerable variation can be seen in the structure and size of this organelle. Unless specifically stained, they are not visible. These structures are described as ""the powerhouse of the cell"" because they generate most of the cell's supply of adenosine triphosphate (ATP), used as a source of chemical energy. In addition to supplying cellular energy, mitochondria are involved in other tasks, such as signaling, cellular differentiation, and cell death, as well as maintaining control of the cell cycle and cell growth. Mitochondria have been implicated in several human diseases, including mitochondrial disorders, cardiac dysfunction, and heart failure. A recent University of California study including ten children diagnosed with severe autism suggests that autism may be correlated with mitochondrial defects as well.Several characteristics make mitochondria unique. The number of mitochondria in a cell can vary widely by organism, tissue, and cell type. For instance, red blood cells have no mitochondria, whereas liver cells can have more than 2000. The organelle is composed of compartments that carry out specialized functions. These compartments or regions include the outer membrane, the intermembrane space, the inner membrane, and the cristae and matrix. Mitochondrial proteins vary depending on the tissue and the species. In humans, 615 distinct types of protein have been identified from cardiac mitochondria, whereas in rats, 940 proteins have been reported. The mitochondrial proteome is thought to be dynamically regulated. Although most of a cell's DNA is contained in the cell nucleus, the mitochondrion has its own independent genome. Further, its DNA shows substantial similarity to bacterial genomes.
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