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7. Below is the structure of lysine in its hypothetical neutral form. Choose the structure of...
7. Below is the structure of lysine in its hypothetical neutral form. Choose the structure of lysine as it would exist in aq. solution at neutral pH. O HN-CH-C-OH CH CH CH CH NH2 lysine . HUN-CH-C- CH-8- -OH ---- H2N-CH HN- OH CH2 H₂N-CH 1 CH2 CH2 1 CH2 H₂N -CH- CH2 CH2 CH2 CH2 CH2 CH CH CH2 CH CH2 CH2 CHE CH2 CH2 NH CH2 CH2 NHS NHS NH3 E NH2 D с B А
The correct structure for Lysine at pH 2.5 is: O H2N-CH-C 0 *HAN-CH=C- o H2N-CH-C-OH "HN-CH-C-OH CH2 CH2 CH2 CH2 CH CH CH2 CHE ÇH₂ NH2 NH, NH NH" b
Knowing the information found in the table below, what is the predominant form of lysine at pH 9.5? pka of α-NH3+ pKa of side chain Amino Acid pK, of α-COOH Lysine 2.18 8.95 10.53 H3N H2N NH2 NH H2N H3N OH OH NH2 NH2
1. Name the following or Draw the Structure (2 x 3 pts each) a. N-methyl-3-phenylpentan-2-amine OH b. OH NH2O 2. Draw the starting materials for the following hydrolysis reactions. (3 pts each) 1. NaOH, H2O a. 3-or 2. HCI, H2O OH OH Ph 1. NaOH, H2O b. HO Н. CH3 OH HPh 2. HCI, H2O 3. Of the following, which form would actually exist at: (5 points) a) pH = 2 (acidic) b) pH = 7 (neutral) c) pH =...
explain the following answers 8. (3 pts) Consider the structure of histidine, shown below, along with the three pk, values of the three acidic groups. What is the isoelectric point (pl) for histidine? NH2 pka COOH = 1.77 = 6.10 pka, NH3+ = 9.18 pka, ning A) 3.94 C) 5.68 B) 5.48 D) 7.64 histidine OH 9. (3 pts) Which one of the following forms of histidine is the form that would mainly exist near pH = 4? HN NH2...
Question 17 (4 points) What is the correct structure of histidine at pH 1? The pKa values are 1.8 (carboxylic acid). 9.2 (amine (conjugate acid)), and 6.0 (sidechain, the double bonded N in ring)? OH NH H2 СНС NH С NH H2 CHC 뿔 NH OH H2 NH CH-C NH2 ON 0 NH 42 CH-C NH3
8. Choose the most predominant form of tyrosine in a solution of pH = 9.5? or and on London 9. Draw the major product of the following Hofmann elimination. NH CH3-1 1. Ag20, H20 excess 2. heat ? CHIN 10. Complete the following synthesis by selecting from the list of 10 reagents below. Each reagent (or set of reagents) is labeled as a letter. In the answer box, simply place the order of reagents used as uppercase letters. For example,...
1. What amino acids do the following abbreviations stand for? Draw the structure of each. a) lle b) Thr c) Gin 2. Name and draw the structures of the amino acids that fit these descriptions: a) Contains an isopropyl group b) Contains a secondary alcohol group 3. Which of the following objects is chiral? a) A pair of scissors b) A comb c) A drinking glass 4. What does the term achiral mean? Give two examples involving organic structures.. 5....
Bleach is a common household cleaner that removes stains, disinfects, and can be used to whiten clothes. The % ionization curve for hypochlorite is shown to the right. The primary ingredient of household bleach is sodium hypochlorite (NaCl), which is typically in a concentration around 0.67 M of the base OCI. What is the pH of household bleach? 1001.------- 1 1- % OCI ------- -- - - 1 ILI I - - 50 L 1 TT +- - - --...
HO CH сн. CH2 нс HC CH3 HAC-HC CH CH CH CH d) OH OH 13. The labels have fallen off three bottles. Bottle A contains a gas, bottle B contains a liquid, and bottle C contains a solid. The labels indicate that the compounds have the same number of carbon atoms, one being an alkane, one an alcohol, and the other a carboxylic acid. Suggest the identity of the contents of each bottle, and give reasons for your explanation...