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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Chapter 11, Problem 35P
Interpretation Introduction
Interpretation:
The reason for difficulty in determining the structure of oligosaccharides when compared to amino acid or
Concept introduction:
The oligosaccharide consists of monosaccharide and forms N-glycosidic linkages. Oligosaccharides are lactose
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2. Structural representation of tetrapeptide Phe-Met-Tyr-Asn
Peptides.
1. Draw the peptide Ala-Glu-Gly-Lys, as it would occur at physiological pH = 7.4.
The R groups of Ala and Gly are not acidic or basic, therefore do not have a pka and the charge
on these R groups is therefore independent of pH. Glu is acidic and Lys is basic, therefore the
charge on these amino acids is pH dependent. The pKas are shown below.
pKa
N-term = 9.0
C-term = 3.5
Glu4.1
Lys = 10.5
2. Draw a circle around the peptide bonds.
3. Label the C-terminus and the N-terminus.
4. What is the overall charge on the peptide at pH 7.4?
Need help.
Which one of the following statements is FALSE?
Group of answer choices
A.Beta-pleated sheets are part of the secondary structure of proteins
B.The nitrogenous bases of DNA are located on the inside because they are hydrophobic in character
C.The peptide bond is formed by dehydration synthesis
D.Alpha helices are stabilized by attraction between the amino acid R groups
E.The peptide bond is rigid and planar and has partial double bond character
Chapter 11 Solutions
Biochemistry
Ch. 11 - Prob. 1PCh. 11 - Prob. 2PCh. 11 - Prob. 3PCh. 11 - Prob. 4PCh. 11 - Prob. 5PCh. 11 - Prob. 6PCh. 11 - Prob. 7PCh. 11 - Prob. 8PCh. 11 - Prob. 9PCh. 11 - Prob. 10P
Ch. 11 - Prob. 11PCh. 11 - Prob. 12PCh. 11 - Prob. 13PCh. 11 - Prob. 14PCh. 11 - Prob. 15PCh. 11 - Prob. 16PCh. 11 - Prob. 17PCh. 11 - Prob. 18PCh. 11 - Prob. 19PCh. 11 - Prob. 20PCh. 11 - Prob. 21PCh. 11 - Prob. 22PCh. 11 - Prob. 23PCh. 11 - Prob. 24PCh. 11 - Prob. 25PCh. 11 - Prob. 26PCh. 11 - Prob. 27PCh. 11 - Prob. 28PCh. 11 - Prob. 29PCh. 11 - Prob. 30PCh. 11 - Prob. 31PCh. 11 - Prob. 32PCh. 11 - Prob. 33PCh. 11 - Prob. 34PCh. 11 - Prob. 35PCh. 11 - Prob. 36PCh. 11 - Prob. 37PCh. 11 - Prob. 38PCh. 11 - Prob. 39P
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- Peptide mass determination. You have isolated a proteinfrom the bacterium E. coli and seek to confirm its identityby trypsin digestion and mass spectrometry. Determinationof the masses of several peptide fragments has enabled youto deduce the identity of the protein. However, there is adiscrepancy with one of the peptide fragments, whichyou believe should have the sequence MLNSFK and an(M 1 H)1 value of 739.38. In your experiments, yourepeat edly obtain an (M 1 H)1 value of 767.38. What isthe cause of this discrepancy and what does it tell youabout the region of the protein from which this peptide isderived?arrow_forwardcotton. 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 bondsarrow_forwardBe 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.arrow_forward
- Be sure to answer all parts. Give the amino acid sequence of an octapeptide that contains the amino acids Val, Met, Asp (2 equiv), Phe, Trp, Ile, Lys, and forms the following fragments when partially hydrolyzed with HCl: Ile-Asp-Phe, Lys-Met-Val-Trp, and Phe-Asp-Lys-Met. Trp Leu Phe Leu Val Lys Gly Tyr Xarrow_forward7 Protein structure.Circle one of the three amino acid sequences that is most likely to form a stable a-helix? RASKTARQ DASKTAEQ KPGKPAGQ In one sentence (that can be accompanied by a small picture) explain why?arrow_forwardIdentify. Examine the following four amino acids (A-D): Co0 "H,N- CH "H,N CH "H;N-CH "H,N CH CH2 CH2 CH, CH CH2 CH3 CH, CH2 OH NH," B D What are their names, three-letter abbreviations, and one-letter symbols?arrow_forward
- Be sure to answer all parts. Give the amino acid sequence of an octapeptide that contains the amino acids Lys, Pro, Tyr, Ile (2 equiv) , Gln, Trp, Phe, and forms the following fragments when partially hydrolyzed with HCl: Lys–Ile-Phe-Pro, Phe-Pro-Gln-Tyr, and Trp-Ile-Lys.arrow_forwardHelp? Please explain salting out in protein purification.arrow_forwardE. PROTEIN PRIMARY STRUCTURE ELUCIDATION. 1. Determine the primary structure of the protein described below. Write the final sequence using the corresponding three-letter code for each amino acid. Example: M-F-Y-R should be written as Met-Phe-Tyr-Arg Treatment with cyanogen bromide and sequencing yields the following peptide fragments: o D-M o R-A-Y-G-N o L-F-M Chymotrypsin digestion and sequencing yields the following peptide fragments: o G-N D-M-L-F o M-R-A-Y o oarrow_forward
- Long explanations are not needed. Answers and brief descriptions would be enough. During the formation of the peptide bond which of the following takes place? a. Hydrogen atom is lost from its carboxyl group of one amino acid and a hydrogen atom is lost from the amino group of another amino acid. b. Hydrogen atom is lost from its carboxyl group of one amino acid and a hydroxyl group is lost from the amino group of another amino acid. c. Hydroxyl group is lost from its carboxyl group of one amino acid and a hydroxyl group is lost from the amino group of another amino acid. d. Hydroxyl group is lost from its carboxyl group of one amino acid and a hydrogen atom is lost from the amino group of another amino acid.arrow_forwardWho's charged? Draw the structure of the dipeptide Gly-His. What is the charge on the peptide at pH 5.5?pH 5.5? pH 7.5?pH 7.5?arrow_forwardShape and dimension. (a) Tropomyosin, a 70-kDa muscle protein, is a two-stranded α-helical coiled coil. Estimate the length of the molecule. (b) Suppose that a 40-residue segment of a protein folds into a two-stranded antiparallel β structure with a 4-residue hairpin turn. What is the longest dimension of this motif?arrow_forward
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