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Third Lecture - LSU School of Medicine
Third Lecture - LSU School of Medicine

... foreign invaders in the infected tissues. ...
Review Questions
Review Questions

... d. energy released from movement of protons through ATP synthase e. No external source of energy is required because the reaction is exergonic. ____ 17. Approximately what percentage of the energy of glucose ( ) is transferred to storage in ATP as a result of the complete oxidation of glucose to and ...
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Steps of Translation
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... 2. A tRNA carrying an amino acid approaches 3. The Anticodon on the tRNA pairs with codon 4. The tRNA drops off it’s amino acid 5. An enzyme forms a peptide bond between amino acids 6. This process continues to form a protein until a STOP codon is reached and then the new protein is released. ...
essential amino acid
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Organization: The 6 Essential Elements
Organization: The 6 Essential Elements

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View PDF - CiteSeerX

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The Body`s Fundamental Building Blocks
The Body`s Fundamental Building Blocks

... Phone: (757) 473-3770x 203 ...
Name_________________________________________
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... a) What are the four major types of biological molecules discussed in lecture? Give one important function of each type of biological molecule in the cell? ...
Bio102 Problems
Bio102 Problems

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The Body`s Fundamental Building Blocks
The Body`s Fundamental Building Blocks

... The Body’s Fundamental Building Blocks What are amino acids and why are they important? Known as the “building blocks” of proteins, amino acids have many important functions in the body including the regulation of muscle and hormone activity and the formation and maintenance of every tissue in the b ...
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Metabolism



Metabolism (from Greek: μεταβολή metabolē, ""change"") is the set of life-sustaining chemical transformations within the cells of living organisms. These enzyme-catalyzed reactions allow organisms to grow and reproduce, maintain their structures, and respond to their environments. The word metabolism can also refer to all chemical reactions that occur in living organisms, including digestion and the transport of substances into and between different cells, in which case the set of reactions within the cells is called intermediary metabolism or intermediate metabolism.Metabolism is usually divided into two categories: catabolism, the breaking down of organic matter by way of cellular respiration, and anabolism, the building up of components of cells such as proteins and nucleic acids. Usually, breaking down releases energy and building up consumes energy.The chemical reactions of metabolism are organized into metabolic pathways, in which one chemical is transformed through a series of steps into another chemical, by a sequence of enzymes. Enzymes are crucial to metabolism because they allow organisms to drive desirable reactions that require energy that will not occur by themselves, by coupling them to spontaneous reactions that release energy. Enzymes act as catalysts that allow the reactions to proceed more rapidly. Enzymes also allow the regulation of metabolic pathways in response to changes in the cell's environment or to signals from other cells.The metabolic system of a particular organism determines which substances it will find nutritious and which poisonous. For example, some prokaryotes use hydrogen sulfide as a nutrient, yet this gas is poisonous to animals. The speed of metabolism, the metabolic rate, influences how much food an organism will require, and also affects how it is able to obtain that food.A striking feature of metabolism is the similarity of the basic metabolic pathways and components between even vastly different species. For example, the set of carboxylic acids that are best known as the intermediates in the citric acid cycle are present in all known organisms, being found in species as diverse as the unicellular bacterium Escherichia coli and huge multicellular organisms like elephants. These striking similarities in metabolic pathways are likely due to their early appearance in evolutionary history, and their retention because of their efficacy.
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