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- Experimental observations show that thiocyanate (SCN- ), the conjugate base of thiocyanic acid (pKa = 1.1 at 25 °C), is quite soluble in neutral water at pH > 2. In the space provided below, explain this experimental observation. That is, why does SCN– readily dissolve in water when the pH > 2?In the structures of T—A and C—G base pairs, there are three amino groups specifically labeled as “sp2 hybridized and planar”. What is the primary difference between these structures and that of aniline that lead to their planarity? 1. In contrast to aniline, the amino groups on the DNA bases are necessary to make the heterocyclic rings aromatic. 2. In contrast to aniline, the contributing structures that delocalize the nitrogen lone pairs onto the rings creates partial negative charges on electronegative atoms. 3. In contrast to aniline, the hydrogen bond accepting ability of the lone pairs on the -NH2 groups of the DNA bases is better when these amino groups are sp2 hybridized. 4. Both 2 and 3.Thymine is one of the heterocyclic bases found in DNA. Do you expect thymine to bearomatic? Explain
- The side chain of acetyl-L-lysine-OMe has a pKa=10.5 and its acid-dissociation reaction is shown below. A.. for this reaction, which form of lysine represents A- and which is HA?How much 0.5 M KOH must be added to 200 mL of 50 mM glycine at ph 8.6 to bring its ph to exactly 10.6? pka of glycine= 9.6 please explainAccording to the paper, F486 is a phenylalanine residue (i.e., an amino acid that is part of a chain that forms a protein) on SARS-CoV-2. It has an important interaction with ACE2 (best seen in Fig. 1(C) and Fig. 2(A)). Looking at this phenylalanine and the green residues surrounding it, which statement best describes the interaction that could be occurring? a) It forms a hydrogen bond with Y83. b) It forms a dipole-dipole interaction with M82. c) It forms London dispersion forces with surrounding residues. d) It encounters repulsions from surrounding residues.
- Please consider the structural formula of the amino acid shown below when answering the following questions. Assume that the pKa values are as shown below. (A) draw the form of this amino acid that predominates at pH 8 (B) classify the amino acid as hydrophilic or hydrophobic (C) what is the net charge of this amino acid at pH 1?Is TMA a volatile compound or a biogenic amine? (explain further) Is the measurement of TMA a reliable index of spoilage? Why and why not? (explain further)Which separation technique is the most specific and offers the highest protein purification possible?
- In 0.1M solution glycine (pKa 9.6) at pH of 9.0, what fraction of glycine has its amino group in the -NH3+ form?Glutamic acid is a naturally occurring α-amino acid that contains acarboxy group in its R group side chain. (Glutamic acid isdrawn in its neutral form with no charged atoms, a form that does not actually exist at any pH.) a.) What form of glutamic acid exists at pH = 1?b.) If the pH is gradually increased, what form of glutamic acid exists afterone equivalent of base is added? After two equivalents? After threeequivalents?c.) Propose a structure of monosodium glutamate, the common flavorenhancer known as MSG.The side chain of acetyl-L-lysine-OMe has a pKa=10.5 and its acid-dissociation reaction is shown below. B. At what pH does [A-]=[HA]?