sp07 first exam notes

sp07 first exam notes - BIOCHEMISTRY 102 FIRST EXAM NOTES...

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BIOCHEMISTRY 102 FIRST EXAM NOTES Paul A. Price. Spring 2007 The first exam will cover the material presented in the first 9 lectures and in problem sets 1 through 3. Please use the required reading to better understand the material covered in lecture and to obtain the necessary background information for the solution of problems. No examination question will deal with information presented in the text but not in lecture, notes to exam, or a problem set. The following list gives you a specific description of the major areas that will be covered in this exam and the types of problems to expect, and a thorough understanding of this material should prepare you for the exam. Copies of the exams from past years can be obtained at the course website. 1. Any problem in problem sets #1-3, or slight variations on these problems, may be on the exam. 2. Be able to identify each of the 20 common amino acids if you are given the correctly drawn structure. Know the three and one letter abbreviations for each amino acid. 3. Protein structure : Know the definitions of the 4 levels of protein structure (eg, primary, secondary, tertiary, and quaternary). Know which amino acids have non-polar side chains, which have uncharged polar side chains, and which have charged polar side chains. Know that the α helix is a right handed coil in which all N-H groups hydrogen bond with C =O groups 4 residues apart in the sequence, and that all R groups project outward from the α helix core and define the character of the helix surface. Know the difference between parallel and antiparallel pleated sheet structures, and know that all N-H groups and C =O groups in an interior β strand form hydrogen bonds with one or the other adjacent β strands. Know that R groups alternately project above and below the β sheet plane and so define the character of the surfaces of the sheet. Know that pure α helices are found in some fibrous structures (hair) while pure β sheets are found in other fibrous structures (eg, silk) and that, in a typical globular protein, helices are 15 residues long and typical β strands are 10 residues long. Know that, in typical globular proteins, all amino acids with hydrophobic side chains are found on the interior of the molecule, where they associate to escape contact with water, and that amino acids with polar and charged side chains are found on the protein surface. Know that the tendency of oil and water to separate into phases is the same driving force that causes the hydrophobic amino acid side chains to associate on the protein interior to escape contact with water, and that this hydrophobic association drives the formation of the 3D structure of a protein. Know that all interior peptide bonds are involved in N-H to O =C hydrogen bonds, and that the structure will be de-stabilized by 15 to 30 kJ/mole for each H bond that isn’t formed. Know that the protein interior is solidly packed, with a density equal to that of an organic crystal, and that there is no water in the
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sp07 first exam notes - BIOCHEMISTRY 102 FIRST EXAM NOTES...

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