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BabcockHall

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  1. Is this a homework problem or an exam problem? Can you explain what you were taught and what you do and don't understand at this point?
  2. Structure A could be fixed by adding a formal charge to oxygen. There is a good reason to insist that formal charges should always be written out explicitly and not assumed or inferred.
  3. Have you searched using PubMed? I am not sure that it would pick up dissertations, but it would surely find research articles.
  4. This part of Science Forums is for helping, not for giving answers.
  5. On your reactant side there are a total of five carbons, and on your product side, there are four carbons. Also when an amine adds into a ketone or aldehyde, one obtains an imine. There would have to be a reduction to obtain an amine. I have no idea what the ideal solution is, but I might be tempted to look for amino acids or common metabolic intermediates that have the same number of carbon atoms. With respect to the route I suggested or with respect to valine, I would also look into various kinds of known racemase, epimerase, or mutase reactions.
  6. One thing to consider is that transporting CO2 in C-4 plants costs two ATPs IIRC.
  7. Ah, that is more of a physiological question, and I don't know much in that area. With respect to the glucose transporter family, they are not engaged in active transport. On the other hand, glucose transport into the cell from the intestinal lumen is accomplished via active transport.
  8. I mean transporters that reside in the plasma membrane itself. For example there is a family of glucose transporters (GLUTn, where n = 1, 2,...) that facilitate the diffusion of glucose across plasma membranes. Chapter 11 in Nelson and Cox's principles of biochemistry textbook has a good discussion at the advanced undergraduate level.
  9. Amino acids are synthesized from their own pathways, entirely separate from the synthesis of RNA. A family of twenty aminoacyl tRNA synthetase enzymes is responsible for joining the amino acid to its cognate tRNA. These are questions and topics that it takes a biochemistry textbook chapters to develop.
  10. Is this homework? Do you know anything about membrane-bound transporters? These are proteins that have certain specificities for things like glucose and other metabolites.
  11. Would you please say a bit more about good packing and column geometry? With respect to gradients and ion-exchange, I have seen a book the recommended short, broad columns over taller columns. But I don't know whether or not this carries over to affinity columns.
  12. Did you use any other information besides titration to find the identities of the two amino acids? I may be misunderstanding the question, but it might help to think about what glycine could take away.
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