CHAPTER THREE

CHAPTER THREE - CHAPTER THREE Macromolecules- 4 types-...

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CHAPTER THREE Macromolecules Will be present & be formed in the same amounts, and same ways in all living things A giant polymer-many small bonding monomers together. Most bonds are covalent Have many functions depend on chemical properties and shape. Use them for energy storage, structural support, transport(in & out of cells), protection, and defense (skin or immune system), metabolic activities, movement, growth, and development, heredity (DNA). To form a polymer you have a condensation reaction. Proteins An amino acid is the monomer for building the protein. There are 20 different amino acids. Amino Acids - the abc’s of proteins Can be up to thousands of amino acids long The R group is always different in all amino acids-they can be hydrophilic, hydrophobic, positively or negatively charged, have ability to have a disulfide bonding. Put 2 amino acids together=peptide bond, 2=dipeptide, 3=tripeptide, more than 3 up to 20=polypeptide. Different levels of complexity or structure 1. Primary -sequence of amino acids (peptide backbone) N-C-C-N-C-C-N(- are peptide bonds) 2. Secondary -repeated patterns in different regions of the polypeptide chain. The most common *Alpha Helix (α) *Beta Pleated Sheet (β) Depend on Hydrogen Bond
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* Alpha Helix : right handed coil-formed by hydrogen bonds, find this with structural & fibrosis proteins. Ex). Keratin * Beta Pleated Sheet : form between peptide regions that lye parallel, hydrogen bonds
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CHAPTER THREE - CHAPTER THREE Macromolecules- 4 types-...

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