Proteins are composed of chains of amino acids

Proteins • are composed of chains of amino acids held together by peptide bonds • are polymers made from a set of 20 monomers or amino acids • The Function of Proteins are: • Body and Cellular Support • collagen in your skin, hair, bones, and arteries provide strength • CAM (cell adhesion molecule) proteins anchor cells together • Organ and Body Movement • actin and myosin filaments in muscle regulate muscle contraction • Cellular Communication • receptors, hormones, and MHC proteins allow cellular communicate • Transportation of Nutrients • hemoglobin carries oxygen via red blood cells throughout the body • Regulation of Physiological Functions • enzymes, hormones, and neurotransmitters regulate many activities

Protein Structure Chain of Amino Acids Held Together by Peptide Bonds Has 4 Levels of Structure Primary Secondary Tiertiary Quarternary

Essential Amino Acids

Peptide Bonds

Teeth

Muscle Tissue • Skeletal Muscle Tissue • Smooth Muscle Tissue • Cardiac Muscle Tissue

Connective Tissue • Cartilage • Bone • Adipose Tissue

Membrane Proteins Cell Proteins serve many different purposes

Enzymes Catalyze chemical reactions

Protein Sources Fig. 6 -17, p. 204

Legumes Seed pods (peas), where nitrogen is stored Root nodules, which capture nitrogen

Fig. 6 -18, p. 205

Meatless Protein? Fig. 6 -13, p. 195

Complementary Proteins Fig. 6 -14, p. 196

Meat, Poultry, Fish, Dried Peas and Beans, and Nuts Make lean or low-fat choices