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CHEM314 – BIOCHEMISTRY 2016 – Homework # 2 HARD COPY DUE: Wednesday, February 10 th at the beginning of class (Please hand in THIS worksheet with additional pages for work if necessary). Name: _________________________________________ Complete the following questions. Be sure to SHOW ALL WORK to receive full credit. While you may work in groups for this assignment, you each must submit your OWN WORK in your own words . Also, if you do work in groups please provide the names of those you worked with (even if from another section). 1. a. For each of the following compounds, identify the acid form and its conjugate base. Consider only functional groups with pK a ’s in the range 1-12. (Note: Only one form is shown. You will have to draw the other form as well as identify it.) O HO
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b. For each of the compounds in your answer to question #1 part a, indicate (by circling the appropriate structure) which species will predominate (i.e. be present in the highest concentration) at pH 8. You will need a table of approximate pK a values for various functional groups to answer this question. This information can be found in most organic chemistry textbooks or online ( ). 2. The structure of a small peptide is shown below. You want to make an aqueous solution of this peptide at the highest concentration possible. Would you choose a dilute acid (say 50 mM HCl or a dilute base (again, say 50 mM NaOH) or a buffer near neutral pH? Why? (Hint: Think about what factors govern water solubility and how pH will affect one of them.) 3. The figure shown below illustrates the binding of substrates (homoserine, on the left and ATP on the right) to an enzyme. Each of the dotted lines indicates a non-covalent interaction between the substrate and the enzyme. For each of these interactions identify its type (charge-charge, hydrogen bond or van der Walls); for hydrogen bonds also indicate which participant is the donor and the acceptor. H N N H HO O OH H 2 N O NH 2 HO O O O
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molecular level view for a fluoride anion in water.gif
CHEM314 - BIOCHEMISTRY 2016 - Homework # 2 HARD COPY DUE: Name: _________________________________________ Complete the following questions. Be sure...
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