Biochemistry: The Molecular Basis of Life
6th Edition
ISBN: 9780190209896
Author: Trudy McKee, James R. McKee
Publisher: Oxford University Press
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Chapter 11, Problem 66TQ
Summary Introduction
To review:
The structural characteristic of waxes that makes them more suitable for preventing dehydration and protection from insects.
Introduction:
Plant produces wax, which covers the leaves. This cover layer protects leaf from insects. The leaf contains small pores called stomata, from which water gets out. However, many plants cover its leaf with a waxy layer, which prevents water loss from the leaf.
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The carbon-nitrogen peptide bond is rigid, but rotation can take place
about the bond between the nitrogen and a-carbon atoms and the bond
between the a-carbon and the carbonyl carbon atom. These bond angles
define the conformation of the peptide chain.
Consider the Ramachandran plot shown to answer both questions.
fr (degrees)
180
120
8280
60
°
-60
Which observation most likely describes part of an observed a helix?
p=-59 degrees; y = +150 degrees; many Ser residues
qp=-140 degrees; w +130 degrees; many Val residues
qp=-57 degrees; y = -47 degrees; many Pro residues
qp=-60 degrees; y = -47 degrees; many Ala residues
p = +60 degrees; y = +40 degrees; many Gly residues
Which observations would not likely occur in a ẞ sheet?
qp=-59 degrees; y = -49 degrees; many Ala residues
qp = +60 degrees; w = +60 degrees; many Gly residues
qp=-120 degrees; y = +120 degrees; many Tyr residues
☐ ☐
qp=-139 degrees; y = +135 degrees; many Val residues
op=-51 degrees; w+153 degrees; many Gly and Pro…
Please give an intuitive explanation of the difference, if any, between toxicokinetics and pharmacokinetics.
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.
Chapter 11 Solutions
Biochemistry: The Molecular Basis of Life
Ch. 11 - Prob. 1QCh. 11 - Prob. 2QCh. 11 - Prob. 3QCh. 11 - Prob. 4QCh. 11 - Prob. 5QCh. 11 - Prob. 6QCh. 11 - Prob. 7QCh. 11 - Prob. 8QCh. 11 - Prob. 9QCh. 11 - Prob. 1RQ
Ch. 11 - Prob. 2RQCh. 11 - Prob. 3RQCh. 11 - Prob. 4RQCh. 11 - Prob. 5RQCh. 11 - Prob. 6RQCh. 11 - Prob. 7RQCh. 11 - Prob. 8RQCh. 11 - Prob. 9RQCh. 11 - Prob. 10RQCh. 11 - Prob. 11RQCh. 11 - Prob. 12RQCh. 11 - Prob. 13RQCh. 11 - Prob. 14RQCh. 11 - Prob. 15RQCh. 11 - Prob. 16RQCh. 11 - Prob. 17RQCh. 11 - Prob. 18RQCh. 11 - Prob. 19RQCh. 11 - Prob. 20RQCh. 11 - Prob. 21RQCh. 11 - Prob. 22RQCh. 11 - Prob. 23RQCh. 11 - Prob. 24RQCh. 11 - Prob. 25RQCh. 11 - Prob. 26RQCh. 11 - Prob. 27RQCh. 11 - Prob. 28RQCh. 11 - Prob. 29RQCh. 11 - Prob. 30RQCh. 11 - Prob. 31RQCh. 11 - Prob. 32RQCh. 11 - Prob. 33RQCh. 11 - Prob. 34RQCh. 11 - Prob. 35RQCh. 11 - Prob. 36RQCh. 11 - Prob. 37RQCh. 11 - Prob. 38RQCh. 11 - Prob. 39RQCh. 11 - Prob. 40RQCh. 11 - Prob. 41RQCh. 11 - Prob. 42RQCh. 11 - Prob. 43RQCh. 11 - Prob. 44FBCh. 11 - Prob. 45FBCh. 11 - Prob. 46FBCh. 11 - Prob. 47FBCh. 11 - Prob. 48FBCh. 11 - Prob. 49FBCh. 11 - Prob. 50FBCh. 11 - Prob. 51FBCh. 11 - Prob. 52FBCh. 11 - Prob. 53FBCh. 11 - Prob. 54SACh. 11 - Prob. 55SACh. 11 - Prob. 56SACh. 11 - Prob. 57SACh. 11 - Prob. 58SACh. 11 - Prob. 59TQCh. 11 - Prob. 60TQCh. 11 - Prob. 61TQCh. 11 - Prob. 62TQCh. 11 - Prob. 63TQCh. 11 - Prob. 64TQCh. 11 - Prob. 65TQCh. 11 - Prob. 66TQCh. 11 - Prob. 67TQCh. 11 - Prob. 68TQCh. 11 - Prob. 69TQCh. 11 - Prob. 70TQ
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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 • 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.arrow_forwardPoly-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.arrow_forwardSamples of the octapeptide AVGWRVKS are subjected to proteolytic cleavage by either trypsin or chymotrypsin. Select the most appropriate technique for separating the digestion products of AVGWRVKS if cleaved by trypsin. salting out ion-exchange chromatography gel-filtration chromatography dialysis Select the most appropriate technique for separating the digestion products of AVGWRVKS if cleaved by chymotrypsin. ion-exchange chromatography gel-filtration chromatography dialysis salting outarrow_forward
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