Biochemistry
9th Edition
ISBN: 9781319114671
Author: Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher: W. H. Freeman
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Question
Chapter 2, Problem 9P
Interpretation Introduction
Interpretation:
The structure of Aspartame at pH 7 should be determined.
Concept introduction:
Aspartame is accepted for usage in food as a nutritious sweetener and is an artificial non-saccharide sweetener.
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Be sure to answer all parts.
Draw the s-trans and s-cis conformations of the peptide bond in the dipeptide Ala-Ala. Be sure to show
appropriate stereochemistry for the natural amino acid and the alkenes.
I
I
I
I
I
draw structure...
s-trans
draw structure ...
s-cis
cotton. Which aspect of the structure of cellulose accounts for its strength?
Cellulose is an abundant structural polysaccharide found in plant cell walls, wood, and
interchain hydrogen bonding between extended molecular chains
repeating unit of N-acetylglucosamine
a(1→4) linkages between glucose units
branches that occur every 12-30 residues
forms a helical conformation in water
Which of the following is not correct about chitin?
fundamental constituent of the exoskeletons of crustaceans, insects, and spiders
b)
chitin chains form extended ribbons that pack side-by side
a)
similar to cellulose but with repeating units of N-acetyl-D-glucosamine
c)
d)
found mainly in the liver in humans, making up as much as 10% of liver mass
stacked sheets of chitin strands are stabilized by intrastrand, interstrand, and
intersheet hydrogen bonds
Be sure to answer all parts.
Give the amino acid sequence of an octapeptide that contains the amino acids Thr, Phe, Ile (2 equiv),
Asp, Cys, Val, Leu, and forms the following fragments when partially hydrolyzed with HCl:
Thr-Ile-Phe, Phe-Ile-Asp-Val, and Asp-Val-Cys-Leu.
Chapter 2 Solutions
Biochemistry
Ch. 2 - Prob. 1PCh. 2 - Prob. 2PCh. 2 - Prob. 3PCh. 2 - Prob. 4PCh. 2 - Prob. 5PCh. 2 - Prob. 6PCh. 2 - Prob. 7PCh. 2 - Prob. 8PCh. 2 - Prob. 9PCh. 2 - Prob. 10P
Ch. 2 - Prob. 11PCh. 2 - Prob. 12PCh. 2 - Prob. 13PCh. 2 - Prob. 14PCh. 2 - Prob. 15PCh. 2 - Prob. 16PCh. 2 - Prob. 17PCh. 2 - Prob. 18PCh. 2 - Prob. 19PCh. 2 - Prob. 20PCh. 2 - Prob. 21PCh. 2 - Prob. 22PCh. 2 - Prob. 23PCh. 2 - Prob. 24PCh. 2 - Prob. 25PCh. 2 - Prob. 26PCh. 2 - Prob. 27PCh. 2 - Prob. 28PCh. 2 - Prob. 29PCh. 2 - Prob. 30PCh. 2 - Prob. 31PCh. 2 - Prob. 32PCh. 2 - Prob. 33PCh. 2 - Prob. 34PCh. 2 - Prob. 35PCh. 2 - Prob. 36PCh. 2 - Prob. 37P
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