does anyone know how to draw the zwitterion structure of glycine?
919210
The zwitterion structure of glycine means it has two ionic charges on it. So, if you know the fundamental structure of glycine, all you have to do is make sure there is a positive charge on the amino group and a negative charge on the carboxyl group of glycine.\n\nI can't draw out the structure but I'll just write out the formula and maybe that will help.\n\nH3N+--CH2--COO-
780311
You are on the right track.\nThis a geometrical problem that requires drawings.\nCheck this link http://departments.kings.edu/chemlab/chemlab_v2/packgeo.html\n\nI'll get back to you later \n\nso later it is\n\n3--------R=r(1+2/3^.5)\n7--------R=3r\n19------R=5r\n37------R=7r\n61------R=9r
302188
The amino and carboxyl protons are very difficult to observe. Using 100% D2O will replace the carboxyl and amino protons with 2H, and you won't see anything. Use a different solvent and you can't be sure you are in the zwitterion form (pH is difficult to control in non-aqueous solutions and you will get different hydrogen bonding)\n\nIf you really want to see those protons your best bet would be to use 90% H2O / 10% D2O with either phosphate buffer or the perdeuterated buffer of your choice (you can get these from Cambridge Isotopes). Make sure the buffer concentration is large compared to your amino acid, and make sure you have adjusted the pH to the zwitterion range. When you aquire the spectrum you will need to use a water suppression sequence. Presat is the easiest, although I much prefer gradient selected 3-9-19. This still may not be enough to see the protons-- if they are exchanging the linewidth may become so broad as to disappear into the baseline.\n\nWhile it's difficult to observe the carboxyl and amino protons (they are *very* sensitive to solvent and pH) you should be able to see changes in the chemical shifts of the remaining protons, particularly the alpha protons.\n\nIf you are really interested, make a sample of your favorite amino acid and take spectra over a range of pH. Plot the chemical shifts of the visible protons as a function of pH and the shape of the curve should allow you to determine the pKa of the amino and carboxyl groups. Here you could get away with just using D2O, which makes the spectroscopy much simpler.\n\nGood luck and have some fun with this!
604105
It's called ASCI art. There's a software that can produce them using software called bg_asci
417571
First off - it's differenTiate not differenciate, terTiary not terciary.\n\nSpelling is important in science - make sure you pay attention to it.\n\nPrimary structure = the sequence of amino acids in the\n                    polypeptide chain; each amino acid \n                    joined to the next by a peptide bond.\n\nSecondary structure = the folding of the polypeptide chain \n                      to form a repeating 3D structure,\n                      whose shape is maintained by hydrogen\n                      bonds, typically forming alpha \n                      helices ( look like springs ) or beta\n                      pleated sheets ( like a sheet of paper\n                      with many folds along its length ).\n\nTertiary structure  = the folding of secondary structure \n                      into a new, more complex 3D shape held\n                      together by ionic, covalent and \n                      hydrogen bonds.\n                      \n                      Many proteins stop at this level.\n\nQuaternary structure = association of multiple polypeptide\n                       chains to form a multimeric structure\n                       held together by all the types of \n                       bonds mentioned for tertiary \n                       structure.\n\nAND PLEASE PLEASE PAY ATTENTION TO SPELLING - for example\nPropane and Propene only differ in one letter but they sure as Hell have different behaviours - this could result in an accident if one were used instead of the other in a laboratory or industrial setting!!
317532
Try here:\n\nhttp://megachem.co.jp/Structures/pdf/SM105.pdf#search='strut%20apparatus'
1049433
http://genchem.chem.wisc.edu/sstutorial/FunChem.htm
383259
go to\nwww.chemistry.com
93891
The important thing is to keep the helical structure clearly visible. Don't worry about the side hydrogens or details of the molecules.\n\nKeep in mind that DNA is a double-stranded helix, and the strands don't revolve around each other identically. Which means there are two sizes of 'grooves': the small grooves are a bit over half the width of the large ones.\n\nIf you use styrofoam balls for the nucleotides and join them with drinking straws (a handy way to do this project), take care that the angle subtended by three of the balls be around 35 degrees.\n\nAbout 10 balls should complete a cycle, which means ball number 11 must be above ball number 1 in a straight line.\n\nDo a strand first, so that it looks fairly twisted yet linear. Add the other strand afterwards. A length of about 20 nucleotides per strand (= 40 in total = 40 small styrofoam balls) should be enough.\n\nGo to a crafts store and buy a bag of balls (they come in 50, 100, etc.) and a bag of 100 drinking straws. Color the balls blue for cytosine, red for thymine, green for guanine and orange for adenine. Pair orange with red and blue with green when building the second strand.\n\nHope this helps.
747559
Simply draw a chart that has each of the 6 variables at right angles to each other, draw lines between the linked variables such coke-greenbike (#3), then use process of elimination.\n\nYeah, right... draw a 6-dimensional hypercube....\n\n Jeez, I've spent about 3 hours on this, and so far it looks like Carla, who was on the yellow bike which was 1st in line, was Bigbird and brought rootbeer and jelly beans.  Either Emily, who was dressed as either dracula or the clown, or Daniel dressed as the other, brought the candycorn.  But at the moment I have a contradiction, which means that somewhere I made a logical error.  I'll try to get back to this sometime later - good luck
11744
I think the question is incomplete.\nIf the question is what is the common feature of their structure, the answer is their similarity in -R group. Ornithine and lysine only differ by a single methylene(-CH2) group. Cystine has less -CH2 group where the N is replaced by less electronegative S atom. Argenine also has similar polar positively charged R group in physiological pH like ornithine and lysine.\nNone has benzene ring!!!!
43181
GGATCGA\n\nGuanine pairs with adonine and cytosine pairs with thymine.
956604
Try it out in the lewis-dot diagram\n      ..        ..\nH-O-Ca-O-H\n      ..        ..
910706
so you plot the proton number on the y-axis, and the different melting points of the elements across the x- axis.. actually are sure it has to be a bar graph.. i think a line/scatter graph would be more accurate maybe?
1064482
One of the best programs is Chemwindow.\nYou can find evrything about it at: http://www.bio-rad.com/B2B/BioRad/product/br_category.jsp?BV_SessionID=@@@@1669986194.1150690834@@@@&BV_EngineID=ccchaddidjeemigcfngcfkmdhkkdfll.0&divName=Informatics+%7c+Sadtler&loggedIn=false&serviceLevel=Lit+Request&lang=English&csel=null&catLevel=4&catOID=-24402&isPA=false&categoryPath=Catalogs%2fInformatics+%7c+Sadtler%2fCheminformatics%2fStructure+Drawing+and+Reporting+-+ChemWindow\nIt allows 2-D & 3-D presentations, drawing of laboratory installations, directly import IR, NMR, MS, and Raman spectra, and chromatograms, using common native file formats, recognizes stereochemistry and automatically specifies R/S centers and E/Z double bonds, etc, etc....\nIt's intuitive and easy to use even if it's the first time you see it.\nMain drawback.... it's not free ;)\n\nAnother good editor is Isis Draw. \nYou can download it from: www.mdli.com/downloads\nIt's free but you have to create first an account.\nAlso don't forget to take the IUPAC naming plugin (Autonom).
883321
Proteins are both amphoteric and zwiterrionic and so yes the term would be correct. When a protien dissolves in acid any free amine nitrogens will protonate and in base the amide links will deprotonate therefor amphoteric. In pure deionised water (pH-7) the acidic amide links will protonate the basic free NR3 and so also zwitterionic.
855087
Ca2+=[Ar]\nMg2+=[Ne]\nI-=[Xe]\nF-=[Ne]