exam 1 set

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zzto
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284488
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exam 1 set
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2014-12-02 19:38:32
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exam set 1
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  1. do work
  2. The titration curve for Asparate would show
    3 titration curves
  3. what is the pH of a solution that has a [H+]= 2.35X10^-3
    2.6 (remember, H+ slightly up means pH slightly down)
  4. Leucine zippers are very highly enriched in which of the following protein quarternary structures?
    Coiled-coils
  5. The amino acid cysteine plays an important role physiologically in protein structure because
    it forms intra- or interchain disulfide bonds
  6. which of the following is not a hydrophobic amino acid
    Thr
  7. The pKa of lactic acid is 3.8 and acetic acid is 4.8. Which is weaker?
    acetic acid is a weaker acid. Bigger pKA= weaker acid
  8. A buffer solution at pH 5.0 has a ratio of [HA]/[A-] of 2. What is the pKA of the acid.
    5.3 use henderson hasselbalch
  9. How does a buffer solution work?
    Its used to neutralize the incoming H+ or OH- to maintain the pH of a solution.
  10. Which group consists only of amino acids with polar side chains
    cysteine, threonine, and histidine.
  11. Which of the following molecules will not form hydrogen bonds?
    anything with N O or F, probably something like CH4
  12. What is the predominant form of the amino acid abbreviated D at pH 7?
    negative
  13. The net charge on the amino acid R in a solution is closest to???
    +1
  14. A reaction that produces a lot of H+ at pH 6.1 would need a buffer made from a 6.0 acid or a 7.3 acid?
    6.0
  15. What charged groups are present in serine at a pH of 11? The two pKa for serine is 2.21 and 9.15
    COO-
  16. The peptide bond...
  17. Which of the following refers to the spatial arrangement of subunits and the nature of their interactions?
    Quaternary structure
  18. What is the common buffer system of the human body?
    H2PO4-/HPO42-
  19. The free ketone of D-fructose can form a reversible intramolecular bond with the hydroxyl group attached at carbon 6 to form what is known as a...
    a hemiketal furanose
  20. 22?
  21. be able to recognize sphingomyelin
  22. alpha vs beta glucose? D vs L?
  23. What does DPPC do?
    Acts as a surfactant to decrease the surface tension of water in alveoli
  24. highest vs lowest melting point of fatty acids?
    • higher= longer and less double bonds
    • lower= shorter and more double bonds.
  25. The difference between starch and glycogen is/are
    The degree of branched side chain is different between starch and glycogen
  26. What are the main lipids of the membrane?
    phospholipids, glycolipids, and cholesterol
  27. Ramachandran angle chart
    top left=beta sheet, top right= left handed alpha helix, bottom left= right handed alpha helix
  28. whats the weight of a protein containing 200 amino acids?
    22,000 daltons (200*110)
  29. glycogen is an a-1,4 linked glucose with branch points liked by
    a 1-6
  30. positron tomography
    • -cocain addicts have LOW glucose usage
    • -radioactive taber usually has a short decay half life
    • -glucose can pass through the blood brain barrier
    • -a radioactive tracer is incorporated into biologically active molecules such a glucose and injected
  31. In archaebacterial membrane, the fatty acids are linked to the glycerold backbone by what type of linkage
    Ether
  32. Which of the followings is the correct order for membrane permeability of different species
    H2O> Indole> tryprophan> glucose> Na+
  33. How chiral carbons are there for glucose
    4
  34. recognize and a (1-4) bond
  35. water is very cohesive as each water molecule can form as many as
    4 hydrogen bonds, 2 as a doner and 2 as an acceptor
  36. in general which of the following bonds in the strongest
    covalent bond is stronger than ionic
  37. calculate the Tm of a primer
    4(G+C) + 2(A+T)= melting temp in degrees C

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