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# Midterm Policies - PowerPoint PPT Presentation

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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• 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

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?

• 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)

Sequencing:What are these compounds and what do they do?

LiBH4

• 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?

• 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?

• What is cooperativity?

• What is allosteric regulation?

• What are the regulators of Hb? And what type of regulators are they?

• 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?