Chapter Six Notes - Chapter Six Overview of Protein Body is...

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Chapter Six Overview of Protein Body is made up of thousands of proteins Contains nitrogen, carbon, hydrogen, and oxygen Functions Regulates and maintains body functions Provides essential form of nitrogen (in the form of amino acids) Amino Acids 20 different amino acids make up all proteins analogous to letters of the alphabet 9 essential amino acids 11 nonessential amino acids Protein Synthesis DNA contains coded instructions Copies of codes Transferred to the cytoplasm (via mRNA) Amino acids added one at a time With aid of transfer RNA (tRNA) Requires energy Protein Organization Order of amino acids in a protein determines its ultimate shape Protein’s final shape determines its function in the body Dietary Protein High-quality Complete Low-quality Incomplete All-or-none principle in protein synthesis Limiting amino acids Complementary proteins Animal Protein Contribution to our diet
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