biochem exam prep 1

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zzto
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biochem exam prep 1
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2014-12-01 18:52:53
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biochem exam prep 1
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  1. 1
  2. The ketone group of D-fructose can form a reversible intramolecular bond with either the hydroxyl group attached at carbon 5 or 6 to form what is known as a
    hemiketal
  3. If the intramolecular bond formed for frutose in question 1 connects to the ketone and the hydroxyl group at carbon 5, we form a circular molecule which can be referred to as a
    furanose
  4. in protein, what level of structure refers to the three-demensional arrangement of all the atoms in a multiple polypeptide chains.
    quarternary
  5. What makes a reducing sugar?
    alcohol/ acid?? ask someone
  6. recognize an omega-3 fatty acid, sphingomyelin, steriod, triacylglcerol, and a glycophospholipid
    ..
  7. What lipids contain fatty acids as part of their structure
    all of the above, phospholipids, cerebrosides, DPPC
  8. The titration for M would show
    2 platues
  9. should i memorize amino acids again?
  10. Cellulose is connected by which of the following glycosidic bonds?
    B- 1,4
  11. The amino acid H plays an important role physiologically in protein structure because
    it serves as proton shuttle??
  12. If the pH of a solution is 12, then the concentration of hydrogen ions in that solution
    10-12
  13. Whats a membrane lipid composed of sphingosine, fatty acid, and a simple sugar
    cerobroside
  14. Premature infants lack palmitoyl phospatidyl cholines (DPPC) are at risk of develop the repiratory distress syndrone, because
    DPPC serve as a surfactant to decrease the surface tension of water in alveoli
  15. Which of the following about Positron emission tomography is correct
    a radioactive tracer is incorporated into biologically active molecule such as glucose
  16. Whats the number of carbons in fatty acids that are not commonly found in nature?
    NOT SURE IF THESE ARE RIGHT CHECK
  17. In addition to phospholipids and cholesterol, this is a major type of membrane lipid.
    glycolipid
  18. water is remarkably cohesive as each water molecule can form as many as
    4 hydrogen bonds, 2 as a donor and 2 as a acceptor
  19. archaebacteria have modified their lipids to accommodate their environment through
    saturated branches
  20. which of the following is/are aqueous compartments enclosed by a lipid bilayer
    cytoplasm
  21. Some proteins are anchored to the membrane by being covalently attached to a ------- group by a thioester linkage to a specific cysteine residue
    phosphatidate
  22. Which of the followings is the correct order for membrane permeability of different species
    H2O>Indole>Tryptophan>glucose> Na+
  23. Which of the following is not a polar amino acid?
    P
  24. The pKa of lactic acid is 3.8 and acetic acid is 4.8
    acetic acid is a weaker acid
  25. A buffer solution of pH 5.0 has a ration of HA/A- =10. What is the pKa of the acid.
    6
  26. A buffer solution
    not always has a pH of 7
  27. Which group consists only of amino acids with aromatic side chains
    W,F, and Y
  28. Which amino acid contains no chiral atoms
    Glycine
  29. Hydrophobic interactions may occur between the R groups of which of the following amino acids.
    valine and leucine
  30. This amino acid displays a free amino group in the peptide PHE-LYS-ARG-SER-HIS
    PHE
  31. Refer to the following information, what is the predominant form of the amino acid abbreviated D at pH 1?
    Positive
  32. The net charge on the amino acid H in a solution at pH 4 is closest to
    +1
  33. Which amino acid has an R-group which contains only C and H?
    Isoleucine
  34. The net charge on the amino acid K in a solution at pH 6 is closest to
    +1
  35. Consider a reaction that produces a significant amount of H+ and is to be carried out at pH 6.1. Would you use a 6.0 pka acid and 7.3 pka amino acid
    Acid A (6.0)
  36. What groups are present in A at a pH of 11?
    COO- and NH2
  37. The peptide bond
    • -is usually found in the trans conformation
    • -does not has free rotation angle of phi and psi
    • -is shorter than a typical single bond but longer than a double bond
    • -the six atoms of the peptide bond group at planar.
  38. a-helices are different from B-sheets because
    the hydrogen bonds are parallel to axis in a-helices and the hydrogen bonds are perpendicular to axis in B-sheets
  39. Urea denatures the native state of a protein by
    interfering with H-bonds
  40. What type of amino acid has the highest melting point, a liquid like or solid one and how do you tell?
    a solid one (long with few double bonds)
  41. Tm depends on the GC and AT content of a DNA molecule true or false?
    true
  42. Name of molecules that are reducing sugars
    Glucose, fructose, galactose
  43. How many chiral carbons are there for glucose in a ring structure.
    5
  44. cellulose is indigestible to most animals because
    animals do not have the enzymes needed to hydrolyze the beta-glycosidic linkages between the monomer units.
  45. porins are
    "inside out" proteins
  46. When the first oxygen binds to Fe in heme of Hb, the Fe is drawn INTO the plane of the porphyrin ring
    false
  47. Which of the followings about Fe in heme is correct
    the oxidation of ferric ion promotes the superoxide ion production
  48. the second law of thermodynamics states
    the total entropy of a system and its surroundings always increases for a spontaneous process
  49. The oligonucleotide pAGGUCCAUUGAA is best described as
    an RNA oligonucleotide with 5' phosphate
  50. The fetal hemoglobin has higher affinity to O2 than maternal because
    fetus hemoglobin has lower affinity to BPG
  51. The Bohr effect refers to
    -more oxygen was released at a lower pH
  52. In a nucleotide, when the nitrogenous base is rotated such that it does not sit over the ribose ring, the base is said to be in what position.
    anti
  53. What is the approximate mass of a protein containing 300 amino acids?
    33kDa
  54. In general which of the following bonding is the strongest
    covalent bond
  55. What are the pyrimidines?
    T and C
  56. 3 carbon sugar? omega 3 fatty acid? look em up

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