Biochemistry: Concepts and Connections (2nd Edition)
2nd Edition
ISBN: 9780134641621
Author: Dean R. Appling, Spencer J. Anthony-Cahill, Christopher K. Mathews
Publisher: PEARSON
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Chapter 9, Problem 5P
The disaccharide
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The disaccharide α,β-trehalose differs from the α, α structure as shown by having an (α1→ β1) linkage. Draw its structure as a Haworth projection.
Dextrans are polysaccharides produced by certain species of bacteria. They are glucans, with primarily α(1→6) linkages and with frequent α(1→3) branching. Draw a Haworth projection of a portion of a dextran, including one (1→3) branch point.
Gentiobiose (D-Glc(β1→6)D-Glc) is a disaccharide found in some plantglycosides. Draw the structure of gentiobiose based on its abbreviated name. Is it a reducing sugar? Does it undergo mutarotation?
Chapter 9 Solutions
Biochemistry: Concepts and Connections (2nd Edition)
Ch. 9 - Prob. 1PCh. 9 - -D-Galactopyranose rotates the plane of polarized...Ch. 9 - Provide an explanation for the fact that a-...Ch. 9 - Why is a type O individual considered a universal...Ch. 9 - The disaccharide , -trehalose differs from the ,...Ch. 9 - A reducing sugar will undergo the Fehling...Ch. 9 - Prob. 7PCh. 9 - Prob. 8PCh. 9 - Indicate whether the structures shown are R and S...Ch. 9 - Prob. 10P
Ch. 9 - Draw (using Haworth projections) the fragments of...Ch. 9 - One or more of the compounds shown below will...Ch. 9 - Why do you suppose that the influenza virus...Ch. 9 - Prob. 14PCh. 9 - Are mannose and galactose epimers? Allose and...Ch. 9 - Prob. 16PCh. 9 - Explain in about one sentence why it is important...Ch. 9 - Prob. 18PCh. 9 - Prob. 19PCh. 9 - Prob. 20PCh. 9 - Prob. 21PCh. 9 - Prob. 22PCh. 9 - Prob. 23P
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- Trehalose, also known as mycose, is a disaccharide found in certain mushrooms. It is composed of two a-D-glucose linked in a aa(1à1) glycosidic bond. Using Haworth projection, draw the structure of trehalose. Indicate whether it is reducing or non-reducing.arrow_forwardRhaminose is a trisaccharide comprised of fructose (B(2→1), fructose (B(2→1) and glucose. Draw the trisaccharide with the hexose in its chair conformations. Indicate the anomeric carbons, the non-reducing end and any other structural details of interest.arrow_forwarddraw disaccharide as Haworth projection: (shown in image) -is this drawing a reducing sugar? Briefly explainarrow_forward
- Construct the primary structure of the following oligopeptides, preferably in their zigzag formulas.arrow_forwardDraw the Haworth projection of β-D-Altopyranose given the structure of D-Altrose.arrow_forwardImagine a trisaccharide that has D-Altrose, D-Gulose, and D-Ribose. D-Altrose is bonded to D-Gulose in an α(1→4) glycosidic bond and D-Ribose is bonded to D-Altrose in an α(1→6) glycosidic bond. Draw the imaginary trisaccharide using Haworth projection with the appropriate representation of each monosaccharide.arrow_forward
- Draw the two possible Haworth structures (both alpha and beta anomers) for the following monosaccharides and give their corresponding systematic names. [Show the stepwise process] (a) D- Fructosearrow_forwardDraw both possible disaccharides of D-psicose and D-mannose that are joined by an α(1→4) glycosidic linkage. Are either of them now a reducing sugar?arrow_forwardDraw a Fischer projection of L-fucose and L-hexose. What are the similarities in their structure?arrow_forward
- Considering the formation of glycosidic linkages between monosaccharides, how many possible trisaccharides can be produced by combining glucose, mannose and galactose? How does this differ from the number of possibilities for a tripeptide composed of three different amino acids?arrow_forwardHistidine 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_forwardDraw the four stereoisomers of threonine as Fischer projections.arrow_forward
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