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... • glycolysis is an anaerobic process, meaning it does NOT require oxygen • occurs in the cytoplasm • glucose is broken down into pyruvate ...
Carbohydrate
Carbohydrate

... series of enzyme-catalyzed reactions to yield two molecules of the three-carbon compound pyruvate . During the sequential reactions of glycolysis, some of the free energy released from glucose is conserved in the form of ATP and NADH. ...
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Chapter 4 - Cellular Metabolism 4.1 Introduction (p. 74) A. A living

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(Semester VI) Paper 15: PLANT METABOLISM THEORY Unit 1

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Cellular Respiration - Cathedral High School

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Biology 12 - Biologically Important Molecules – Review Worksheet

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October 17 AP Biology - John D. O`Bryant School of Math & Science

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Organic Macromolecules

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Citric acid cycle



The citric acid cycle – also known as the tricarboxylic acid (TCA) cycle or the Krebs cycle – is a series of chemical reactions used by all aerobic organisms to generate energy through the oxidation of acetate derived from carbohydrates, fats and proteins into carbon dioxide and chemical energy in the form of adenosine triphosphate (ATP). In addition, the cycle provides precursors of certain amino acids as well as the reducing agent NADH that is used in numerous other biochemical reactions. Its central importance to many biochemical pathways suggests that it was one of the earliest established components of cellular metabolism and may have originated abiogenically.The name of this metabolic pathway is derived from citric acid (a type of tricarboxylic acid) that is consumed and then regenerated by this sequence of reactions to complete the cycle. In addition, the cycle consumes acetate (in the form of acetyl-CoA) and water, reduces NAD+ to NADH, and produces carbon dioxide as a waste byproduct. The NADH generated by the TCA cycle is fed into the oxidative phosphorylation (electron transport) pathway. The net result of these two closely linked pathways is the oxidation of nutrients to produce usable chemical energy in the form of ATP.In eukaryotic cells, the citric acid cycle occurs in the matrix of the mitochondrion. In prokaryotic cells, such as bacteria which lack mitochondria, the TCA reaction sequence is performed in the cytosol with the proton gradient for ATP production being across the cell's surface (plasma membrane) rather than the inner membrane of the mitochondrion.
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