PPT-Peptides and Proteins 20 amino acids are commonly found in protein. These 20 amino acids

Peptide bond formation αcarboxyl group of one amino acid with side chain R1 forms a covalent peptide bond with αamino group of another amino acid with the side chain R2 by removal of a molecule of water The result is Dipeptide ie Two amino acids linked by one peptide bond By the same way the dipeptide can then forms a second peptide bond with a third amino acid with side chain R3 to give . CHAPTER 3, Part 1 . Amino Acids and Peptides . To know the structure and naming of all 20 protein amino acids. To know the structure and properties of peptides and the particularly the structure of the peptide bond.. B.2. Properties of 2-amino acids . (B.2.2). Zwitterion. (dipolar) . amino acids contain both acidic and basic groups in the same molecule . therefore, are . amphoteric. in nature (capable of behaving as acids or bases). Unit objectives:. Identify amino acid classifications based on nutritional use and chemical properties of side chains. Describe the primary, secondary, tertiary and quaternary structures of proteins. Polypeptides . are chains of amino acids linked together by condensation reactions. the main, or only, component in proteins. Some proteins are composed of only one polypeptide chain, while others are made of 2 or more. 6. 6.1 Differentiate . between essential amino acids and nonessential amino acids.. 6.2 List . the functions of protein in the body.. 6.3 List . the steps for protein digestion and absorption in the body. . Each amino acid (aa) shares a common structure; i.e. an amine (NH. 2. ) group, an acid group (COOH), and a central carbon atom bonded to hydrogen and to a side chain (R).. The side chains qualify aas as acidic, basic, neutral, aromatic, and sulphur-containing amino acids.. for . life.. . The importance of proteins was recognized by chemists in the early 19th century, including Swedish chemist . Jöns. Jacob Berzelius. , who in 1838 coined the term . protein. , a word derived from the Greek . Protein. Builds and repairs body tissue. Provides some energy. There are 4 calories per gram of protein. Protein. Composed of chains of amino acids. Common Amino Acids. Alanine. Glycine. Isoleucine. Leucine. Amino Acids are the building units of proteins.. The main role of amino acids is in the synthesis of structural and functional . proteins.. The . non-essential amino acids are either derived from the. Proteins. are large biomolecules, or macromolecules, consisting of one or more long chains of amino acid residue.. What Are Proteins?. Large molecules. Made up of chains of amino acids. Are found in every cell in the body. A. . Peptides. are compounds, formed of less . than . 50 . amino acids . linked together by peptide bonds.. 1.. . Dipeptide. (2 amino acids and one peptide bond).. 2.. . Tripeptide. (3 amino acids and two peptide bonds).. BSc 3. rd. year . AMINO ACIDS. C. lassification of amino acids . Classification according to nature of side chain. PREPARATION OF AMINO ACIDS. 1. Gabriel Phthalimide synthesis. 2. Strecker’s synthesis. 2017. Introducing proteins. Proteins. are a diverse group of large and complex polymer molecules, made up of long chains of . amino acids. .. They have a wide range of biological roles, including:. structural:. Proteins are naturally-occurring biopolymers comprised of amino acids. . The biological function of proteins is inherent in their three dimensional structure.. All the information required for correct folding of the protein into its functional .