Regents Biology Proteins: The Multipurpose Molecules
Regents Biology Protein Functions enzymes structure transport cell to cell signals defense (antibodies) movement storage
Regents Biology collagen Protein Examples: Keratin hair and nail collagen protein in skin pepsin digestive enzyme in stomach insulin hormone that controls blood sugar levels pepsin insulin
Regents Biology Protein Monomers = amino acids Structure central carbon amino group carboxyl group (acid) R group (side chain) variable group 20 different amino acids —N——N— H H C—OH || O R | —C— | H Oh, I get it! amino = NH2 acid = COOH
Regents Biology Monomer to Polymer = amino acid chains Proteins are amino acids chained into a polymer (called a polypeptide) Each amino acid is different Example some “like” water & dissolve in it Example some “fear” water & separate from it amino acid
Regents Biology
pepsin For proteins: SHAPE matters! collagen Proteins fold & twist into 3-D shape Different shapes = different jobs hemoglobin growth hormone
Regents Biology It’s SHAPE that matters! Proteins do their jobs, because of their shape Unfolding a protein destroys its shape wrong shape = can’t do its job unfolding proteins called “denaturization” temperature pH (acidity) salt folded unfolded “denatured”
Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings
Regents Biology Any questions? Yea…what’s up with that coat? Looks like my cousin