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Concept explainers
Interpretation:
Zwitterion form of Lysine and
Concept introduction:
Many amino acids are linked together through amide bonds to form a biologically large molecule known to be proteins.
Amino
Zwitterion has both positive as well as negative charge, thus it is also called neutral dipolar ion.
Zwitterion accepts proton in acidic condition and in basic condition zwitterion lose electrons.
Isoelectric point
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Chapter 18 Solutions
Fundamentals of General, Organic, and Biological Chemistry, Books a la Carte Plus Mastering Chemistry with Pearson eText -- Access Card Package (8th Edition)
- Does gentiobiose (Problem 20.66) have an acetal grouping? A hemiacetal grouping? Do you expect gentiobiose to be a reducing or nonreducing sugar? How would you classify the linkage (x or β and carbon numbers) between the two monosaccharides?arrow_forwardFollowing are structural formulas for cytosine and thymine. Draw two additional tautomeric forms for cytosine and three additional tautomeric forms for thymine.arrow_forwardDoes trehalose (Problem 20.68) have an acetal grouping? A hemiacetal grouping? Do you expect trehalose to be a reducing or nonreducing sugar? Classify the linkage between the two monosaccharides.arrow_forward
- D- and L- designations are used to distinguish between the two possible enantiomers of the monosaccharide, galactose. From the Fischer projection, determine the designation of this monosaccharide.arrow_forwardWhat is the structural formula of Seryl glycyl tyrosyl alanyl leucine?arrow_forwardGentiobiose has the molecular formula C12H22O11 and has been isolated from gentian root and by hydrolysis of amygdalin. Gentiobiose exists in two different forms, one melting at 86°C and the other at 190°C. The lower melting form is dextrorotatory ([α] 16°), the higher melting one is levorotatory ([α] -6°). The rotation of an aqueous solution of either form, however, gradually changes until a final value of [α] 9.6° is observed. Hydrolysis of gentiobiose is efficiently catalyzed by emulsin and produces two moles of D-glucose per mole of gentiobiose. Gentiobiose forms an octamethylether, which on hydrolysis in dilute acid yields 2,3,4,6-tetra-O-methyl-D-glucose and 2,3,4-tri-O-methyl-D-glucose. What is the structure of gentiobiose? EXPLAIN IN DETAIL.arrow_forward
- Histidine is an amino acid with three titratable groups: an -NH3+ group (pKa = 9.2), a -COOH group (pKa = 1.8), and an imidazole (amine-like) group (pKa = 6.0). The titration curve for histidine is shown below with four points highlighted. (a) Identify which point on the titration curve corresponds to the pKa for each of the titratable groups, and which point corresponds to the pI. Explain your choices. (b) Calculate the value of pI for histidinearrow_forwardSketch the titration curve for the amino acid alanine with pka1 = 2.34 and pka2 = 9.69.arrow_forwardWhat is the complete name of the following sugar? но он носн он Write out the words alpha and beta. This question is case-sensitive. Capitalize only the configuration designation, D or L, example: beta-D-glucopyranose.arrow_forward
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