Proteins.

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Presentation transcript:

Proteins

Learning Objectives Define the following terms: protein, amino acid, peptide bond Describe the relationship between amino acids and proteins

Proteins Proteins are one of the organic macromolecules made from one or more chains of amino acids (monomer).

Parts of an Amino Acid O O Hydrogen Carboxylic Acid Group Amino Group Side Chain O O

20 Amino Acids All of the many types of proteins are made from 20 different amino acids.

Amino Acids Make Proteins Different combinations of amino acids produce different kinds of proteins.

Peptide Bond Amino acids are joined together by peptide bonds. Any amino acid can join any other amino acid.

Structure of Proteins Primary structure – a specific sequence of amino acids Secondary structure – folded polypeptide chain. Tertiary structure – 3-D folding of a polypeptide. Quaternary structure – a complex of protein molecules.

Function of Proteins Movement - actin and myosin in muscle fibers Structure - collagen found almost everywhere in animals Regulation - enzymes Transport - hemoglobin in blood Nutrition - food group Defense - antibodies

End of Proteins