O CHEM 3

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Author:
allenwhycheng
ID:
59854
Filename:
O CHEM 3
Updated:
2011-01-14 18:12:19
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mcat organic chemistry study flashcards
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studying to be a doctori
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  1. formula for calculating max # of possible stereoisomers of a molecule
    2n where n is # of chiral centers
  2. does cellulose contain beta 1,4 glycosidic bonds or alpha 1,4 glycosidic bonds
    beta 1,4
  3. what is mutarotation
    spontaneous change of configuration about the C1that occurs when monosacharides are exposed to water
  4. (t/f) fructose is an aldopentose
    false, its a ketohexose
  5. (t/f) the alpha carbon is chiral in all amino acids
    false, not in glycine. it has 2 hydrogens
  6. zwitterion
    a species with both (+) and (-) charges
  7. In what direction will an amino acid with a neutral side chain move during electrophoresis at pH4
    1.if the pI is 7
    2.if the pI is 3
    3.if the pI is 4
    • 1.the amino acid will have a net positive charge and move toward the cathode
    • 2.amino acid is (-), move to anode
    • 3.amino acid is at its isoelectric point, not moving
  8. (t/f) the buffering capacity of an amino acid is greatest at its isoelectric point
    false, its the least at isoelectric point. its greatest at its 2 or more pKas
  9. what is the net charge of an an acid amino acid at physiological pH
    (-)
  10. what are the 2 primary classifications (tertiary structure) of proteins
    fibrous and globular
  11. conjugated protein?
    a protein that derive part of its function from a prosthetic group

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