MetabolismRev121_OLS - Cell Metabolism Metabolism = all...

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Cell Metabolism Metabolism = all chemical reactions that occur in a cell Chemical bonds store energy, therefore, building large molecules from small molecules requires energy input, and breaking down large molecules into smaller molecules results in energy release (output) Catabolic (Digestion) Reactions = Reactions where complex (large) molecules are broken down into simple (small) molecules and energy (ATP) is generated Anabolic (Biosynthetic) Reactions = Reactions where simple (small) molecules are joined together to form complex (large) molecules; ATP provides the input of energy to form the chemical bonds Metabolic Pathway = A series of reactions that allows for manageable use or production of energy and often produces “intermediate” molecules for use in other pathways Enzymes 1. Are proteins that speed up chemical reactions up to 10 billion times (most of these reactions could never occur without enzymes) 2. Are required for a cell’s metabolic reactions 3. Are NOT used up by the reactions they catalyze (can catalyze a reaction over and over again) 4. Are specific (this means each enzyme catalyzes one reaction) Cellular Energy 1. ATP (adenosine tri phosphate) is the energy carrier molecule for all cells 2. Energy is stored in the bonds between the 3 phosphate groups 3. As cells break down complex molecules, they capture the energy that is produced by adding a phosphate to ADP (adenosine di phosphate) to create ATP ADP + P ATP 4. This stored energy is then made available to the cell to fuel other reactions when the phosphate bonds are broken: ATP ADP + P 1
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Cellular Respiration 1. Step by step process in which carbohydrates (usually glucose) are broken down and their energy is released to produce ATP 2. Respiration takes place in all cells
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MetabolismRev121_OLS - Cell Metabolism Metabolism = all...

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