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Midterm Policies. Location: No Calculators Bring IDs Restroom Policy: Bring exam up to TA 1person gone at a time Come up to TA to ask a question. Office Hour Changes: in 4077A Young Hall. This week ONLY Canceled: Fri 10-11am Additional: Thurs 4-6pm. Weak Acids.

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midterm policies
Midterm Policies
  • Location:
  • No Calculators
  • Bring IDs
  • Restroom Policy:
    • Bring exam up to TA
    • 1person gone at a time
  • Come up to TA to ask a question
office hour changes in 4077a young hall
Office Hour Changes:in 4077A Young Hall
  • This week ONLY
  • Canceled: Fri 10-11am
  • Additional: Thurs 4-6pm
weak acids
Weak Acids

The weak acid H3PO4has 3 ionizablehydrogens, with the pKas: 2.15, 6.82, 12.38

draw the titration curve for: H+ vs pH

pOHvs H+

you make a solution by adding 0.5moles of HPO42- and 0.1 moles of PO43- to 1 Liter of water

What is the pH of the solution? Is it a good buffer?

You add 0.3 moles of NaOH.

What is the new pH of the solution?

Is it still a good buffer?

amino acids peptides
Amino acids/Peptides
  • pKas: COOH=2, Lys = 10.5, Glu = 4.07, NH3=9.5
  • Draw the following peptide at physiological pH: Lakes
    • What is the net charge of the peptide?
    • What is the pI of the peptide?
  • Draw the titration curve for Glutamate (pH vs OH)
  • Chymotrypsin:
    • 1: Ile-Ser
    • 2: Leu-Lys-Val-Phe
    • 3: Ala-Arg-Gly-Try
  • Trypsin:
    • 1: Gly-Trp-Leu-Lys
    • 2: Val-Phe-Ile-Ser
    • 3: Ala-Arg
  • What are the 5 characteristics that we can use to separate proteins from each other?
  • What process can be used for each characteristic?
protein structure
Protein structure
  • What are the levels of protein structure?
    • For each:
      • What interactions stabilize them?
      • How can we determine the structure?
    • Diagram Alpha helices and beta sheets
      • How do you get amphipathic structures in each?
protein regulation
Protein regulation
  • What is cooperativity?
  • What is allosteric regulation?
    • What are the regulators of Hb? And what type of regulators are they?
myoglobin hemoglobin
  • How do Mb and Hb differ in how they bind oxygen?
  • How does this relate to their different biological functions?
  • How does destabilizing the T-state affect oxygen binding to Hb?
  • How does destabilizing the R-state affect oxygen binding to Hb?
  • What is the structure of glycogen?
    • What is its biological function and how does its structure relate to this?
  • How is the structure of Cellulose different from Glycogen?
    • How is this better for its biological function?
  • How are triacylglycerols better suited for long term energy storage than glycogen?
  • A fish has traveled to colder water. How would it change the composition of its membranes?