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Anatomy

QuestionAnswer
1st structural levels of proteins 1. primary structure- amino acids creating a polypeptide chain (beads)
2nd structural levels of proteins 2. secondary structure- when proteins twist or bend upon themselves -alpha helix = coils of a telephone cord -pleated sheets = held together by hydrogen bonds, different parts of the polypeptide chain fold back on themselves
3rd structural level of proteins tertiary- when the alpha helix or pleated sheets fold upon one another to form a compact globular molecule .maintained by hydrogen and covalent bonds
4th structural level of proteins quaternary- when two or more polypeptide chains combine to form a complex protein
Fibrous proteins extended and strandlike .tertiary or quaternary structure .insoluable in water .mechanical support and tensile strength .also known as structural proteins .keratin and collagen
Globular Proteins .compact spherical proteins .at least tertiary structure .water soluable, chemically active, play roles in biological processes .functional proteins .enzymes + antibodies
Protein Denaturation .when proteins lose three dimmensional shape .globular proteins .broken hydrogen bonds through increased changes in ph or temperature
active sites regions that fit and interact chemically with other molecules of similar shape and charge
Molecular Chaperones .help proteins maintain three dimmensional structure .quick and accurate folding .heat shock proteins
Enzymes and Enzyme Activity .enzymes= globular proteins that are biological catalyst
Created by: dsbauer.2011
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