EP FUND.OF GENERAL,ORG...-MOD.MASTERING
8th Edition
ISBN: 9780134326061
Author: McMurry
Publisher: PEARSON CO
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Chapter 20.7, Problem 20.10CIAP
Interpretation Introduction
Interpretation:
The names of two soluble fibers have to be listed and their sources have to be stated.
Concept introduction:
All fibers are polysaccharides.
Amylopectin and glycogen are two soluble polysaccharides.
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A protein biochemist attempted to determine the amino acid sequence of a decapeptide. The results from the trypsin,
chymotrypsin, and cyanogen bromide treatments are shown:
⚫ Trypsin digestion gave two fragments with multiple residues (not in order):
• T1: Ala, Arg, Phe, Gly, Thr, Trp, Tyr
o T2: Lys, Met, Val
Chymotrypsin digestion gave four fragments with multiple residues (not in order):
• CT1: Ala, Phe
• CT2: Thr, Trp
• CT3: Lys, Met, Tyr, Val
。 CT4: Arg, Gly
⚫ Treatment with cyanogen bromide yielded a single amino acid, methionine, and a nonapeptide.
What is a possible sequence of the decapeptide? Use three-letter abbreviations in your answer, and add a dash between
each residue.
A protein biochemist attempted to determine the amino acid sequence of a decapeptide. The results from the trypsin,
chymotrypsin, and cyanogen bromide treatments are shown:
• Trypsin digestion gave two fragments with multiple residues (not in order):
T1: Ala, Arg, Phe, Gly, Thr, Trp, Tyr
• T2: Lys, Met, Val
Chymotrypsin digestion gave four fragments with multiple residues (not in order):
• CTI: Ala, Phe
。 CT2: Thr, Trp
• CT3: Lys, Met, Tyr, Val
。 CT4: Arg, Gly
⚫ Treatment with cyanogen bromide yielded a single amino acid, methionine, and a nonapeptide.
What is a possible sequence of the decapeptide? Use three-letter abbreviations in your answer, and add a dash between
each residue.
Poly-L-leucine in an organic solvent such as dioxane is a helical, whereas poly-L-isoleucine is not.
Why do these amino acids with the same number and kinds of atoms have different helix-forming tendencies?
L-isoleucine's methyl group sterically interferes with α-helix formation, whereas L-leucine's methyl group does
not interfere.
L-isoleucine lacks an NH group that can donate a hydrogen bond to stabilize an a helix, whereas L-leucine has an
NH group.
L-isoleucine contains a hydrogen-bond acceptor in close proximity to the main chain, whereas L-leucine lacks
this group.
L-isoleucine's ring structure prevents it from assuming the op value to fit into an a helix, whereas L-isoleucine does
not have a ring structure.
Chapter 20 Solutions
EP FUND.OF GENERAL,ORG...-MOD.MASTERING
Ch. 20.1 - Classify the following monosaccharides as an...Ch. 20.1 - Prob. 20.2PCh. 20.2 - Prob. 20.3PCh. 20.2 - Prob. 20.4PCh. 20.2 - Prob. 20.6PCh. 20.3 - D-Talose, a constituent of certain antibiotics,...Ch. 20.3 - Prob. 20.8PCh. 20.3 - Draw the structure that completes the mutarotation...Ch. 20.4 - Prob. 20.10KCPCh. 20.4 - Prob. 20.11P
Ch. 20.4 - Prob. 20.12PCh. 20.4 - Prob. 20.13PCh. 20.4 - Prob. 20.1CIAPCh. 20.4 - Prob. 20.2CIAPCh. 20.4 - All cells in your body contain glycoproteins...Ch. 20.5 - Draw the structure of the and anomers that...Ch. 20.6 - Prob. 20.15PCh. 20.6 - Prob. 20.16PCh. 20.6 - Prob. 20.17KCPCh. 20.7 - Prob. 20.4CIAPCh. 20.7 - Prob. 20.5CIAPCh. 20.7 - Prob. 20.6CIAPCh. 20.7 - Prob. 20.7CIAPCh. 20.7 - Prob. 20.18PCh. 20.7 - Prob. 20.19PCh. 20.7 - Prob. 20.8CIAPCh. 20.7 - Prob. 20.9CIAPCh. 20.7 - Prob. 20.10CIAPCh. 20 - During the digestion of starch from potatoes, the...Ch. 20 - Prob. 20.21UKCCh. 20 - Consider the trisaccharide A, B, C shown in...Ch. 20 - Hydrolysis of both glycosidic bonds in the...Ch. 20 - Prob. 20.24UKCCh. 20 - Are one or more of the disaccharides maltose,...Ch. 20 - Prob. 20.26UKCCh. 20 - Prob. 20.27UKCCh. 20 - Prob. 20.28APCh. 20 - What is the family-name ending for a sugar?Ch. 20 - Prob. 20.30APCh. 20 - Classify the four carbohydrates (a)(d) by...Ch. 20 - Prob. 20.32APCh. 20 - How many chiral carbon atoms are there in each of...Ch. 20 - Prob. 20.34APCh. 20 - Prob. 20.35APCh. 20 - Name four important monosaccharides and tell where...Ch. 20 - Prob. 20.37APCh. 20 - Prob. 20.38APCh. 20 - What is the structural relationship between...Ch. 20 - Prob. 20.40APCh. 20 - In Section 15.6, you saw that aldehydes react with...Ch. 20 - Sucrose and D-glucose rotate plane-polarized light...Ch. 20 - Prob. 20.43APCh. 20 - Prob. 20.44APCh. 20 - Prob. 20.45APCh. 20 - What is mutarotation? Do all chiral molecules do...Ch. 20 - What are anomers, and how do the anomers of a...Ch. 20 - What is the structural difference between the ...Ch. 20 - D-Gulose, an aldohexose isomer of glucose, has the...Ch. 20 - Prob. 20.50APCh. 20 - In its open-chain form, D-altrose has the...Ch. 20 - Prob. 20.52APCh. 20 - Prob. 20.53APCh. 20 - Prob. 20.54APCh. 20 - Prob. 20.55APCh. 20 - What is the structural difference between a...Ch. 20 - What are glycosides, and how can they be formed?Ch. 20 - Prob. 20.58APCh. 20 - Prob. 20.59APCh. 20 - Give the names of three important disaccharides....Ch. 20 - Lactose and maltose are reducing disaccharides,...Ch. 20 - Amylose (a form of starch) and cellulose are both...Ch. 20 - Prob. 20.63APCh. 20 - Prob. 20.64APCh. 20 - Prob. 20.65APCh. 20 - Gentiobiose, a rare disaccharide found in saffron,...Ch. 20 - Prob. 20.67APCh. 20 - Prob. 20.68APCh. 20 - Prob. 20.69APCh. 20 - Amylopectin (a form of starch) and glycogen are...Ch. 20 - What is the physiological purpose of starch in a...Ch. 20 - Prob. 20.72APCh. 20 - Prob. 20.73APCh. 20 - Prob. 20.74CPCh. 20 - Prob. 20.75CPCh. 20 - Prob. 20.76CPCh. 20 - Prob. 20.77CPCh. 20 - Prob. 20.78CPCh. 20 - Write the open-chain structure of the only...Ch. 20 - Prob. 20.80CPCh. 20 - Prob. 20.81CPCh. 20 - When a person cannot digest galactose, its reduced...Ch. 20 - Describe the differences between mono-, di-, and...Ch. 20 - Prob. 20.84CPCh. 20 - Prob. 20.85CPCh. 20 - Many people who are lactose intolerant can eat...Ch. 20 - Prob. 20.87GPCh. 20 - Prob. 20.88GPCh. 20 - Prob. 20.89GP
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