Concept explainers
Answers to all problems are at the end of this book. Detailed solutions are available in the Student Solutions Manual, Study Guide, and Problems Book.
13. Determining Tyrosine Content of an Unknown Protein A previously unknown protein has been isolated in your laboratory. Others in your lab have determined that the protein sequence contains 172
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Chapter 4 Solutions
Biochemistry
- Answers to all problems are at the end of this book. Detailed solutions are available in the Student Solutions Manual, Study Guide, and Problems Book. (Historical Context) The Third Person of the -Helix Publication Who was Herman Branson? What was his role in the elucidation of the structure of the or-helix'.' Did he receive sufficient credit and recognition for his contributions? And how did the rest of his career unfold? Do a Google search on Herman Branson to learn about his life, and read the article by David Eisenberg under Further Reading. You may also wish to examine the original paper by Pauling, Corey, and Branson, as well as the following Web site: http://www.pirns. org/sitelmisclclassicsl..shtml Pauling, L., Corey, R. B., and Branson, H. R., 1951. The structure of proteins: two hydrogen-bonded helical configurations of the polypeptide chain. Proceedings of the National Academy of Sciences, USA 37:235-240.arrow_forwardAnswers to all problems are at the end of this book. Detailed solutions are available in the Student Solutions Manual, Study Guide, and Problems Book. Evaluation of -Helices in Proteins The hem agglutinin protein in influenza virus contains a remarkably long -helix, with 53 residues. How long is this -helix (in nm)? How many turns does this helix have? The typical residue in an -helix is involved in two H bonds. How many H bonds are present in this helix?arrow_forwardAnswers to all problems are at the end of this book. Detailed solutions are available in the Student Solutions Manual, Study Guide, and Problems Book. To fully appreciate the elements of secondary structure in proteins, it is useful to have a practical sense of their structures. On a piece of paper, draw a simple but large zigzag pattern to represent a -strand. Then fill in the structure, drawing the locations of the moms of the chain on this zigzag pattern. Then draw a simple, large coil on a piece of paper to represent an -helix. Then fill in the structure, drawing the backbone atoms in the correction locations along the coil and indicating the locations of the R groups in your drawing.arrow_forward
- Answers to all problems are at the end of this book. Detailed solutions are available in the Student Solutions Manual, Study Guide, and Problems Book. Exploring the Dimensions of the α-Helix and Coiled Coils Imagine that the dimensions of the alpha helix were such that there were exactly 3.5 amino acids per turn instead of 3.6. What would be the consequences for coiled-coil structures?arrow_forwardAnswers to all problems are at the end of this book. Detailed solutions are available in the Student Solutions Manual, Study Guide, and Problems Book. The Role of Proline Residues in -Turns Pro is the amino acid least commonly found in «-helices but most commonly found in -turns. Discuss the reasons for this behavior.arrow_forwardAnswers to all problems are at the end of this book. Detailed solutions are available in the Student Solutions Manual, Study Guide, and Problems Book. Assessing the Range of and Angles in Proteins Choose any three regions in the Ramachandran plot and discuss the likelihood of observing that combination of and in a peptide or protein. Defend your answer using suitable molecular models of a peptide.arrow_forward
- Answers to all problems are at the end of this book. Detailed solutions are available in the Student Solutions Manual, Study Guide, and Problems Book. Oligonucleotide Structure Draw the chemical structure of pACG.arrow_forwardAnswers to all problems are at the end of this book. Detailed solutions are available in the Student Solutions Manual, Study Guide, and Problems Book. Protein-DNA Interactions Gerie expression is controlled through the interaction of proteins with specific nucleotide sequences in double stranded DNA. List the kinds of noncovalent interactions that might take place between a protein and DNA. How do you suppose a particular protein might specifically interact with a particular nucleotide sequence in DNA'.’ That is. how might proteins recognize specific base sequences within the double helix?arrow_forwardAnswers to all problems are at the end of this book. Detailed solutions are available in the Student Solutions Manual, Study Guide, and Problems Book. Use examples from the ActiveModel for Human GaleLtin-1 to describe the hydrophobic effect.arrow_forward
- Answers to all problems are at the end of this book. Detailed solutions are available in the Student Solutions Manual, Study Guide, and Problems Book. Solving the Sequence of an Oligopeptide From Sequence Analysis Data Amino acid analysis of a decapeptide revealed the presence of the following products: The following facts were observed: Neither car boxy peptidase A nor B treatment of the- decapeptide had any effect. Trypsin treatment yielded two tetrapcptides and free Lys. Clostripain treatment yielded a tetrapcptide and a hexapeptidc. Cyanogen bromide treatment yielded an octapeptide and a dipeptide of sequence NP (using the one-letter codes). Chymotrypsin treatment yielded two tripeptides and a telrapeptide. The N-terminal chymotryptic peptide had a net charge of — 1 at neutral pi I and a net charge of —3 al pH 12. One cycle of Ed man degradation gave the PTH derivative What is the ammo acid sequence of this decapeptide?arrow_forwardAnswers to all problems are at the end of this book. Detailed solutions are available in the Student Solutions Manual, Study Guide, and Problems Book. Interpreting Kinetics Experiments from Graphical Patterns The following graphical patterns obtained from kinetic experiments have several possible interpretations depending on the nature of the experiment and the variables being plotted. Give at least two possibilities for each.arrow_forwardAnswers to all problems are at the end of this book. Detailed solutions are available in the Student Solutions Manual, Study Guide, and Problems Book. Why zymogens Are Advantageous Why do you suppose proteolytic enzymes are- often synthesized as inactive zymogens?arrow_forward
- BiochemistryBiochemistryISBN:9781305577206Author:Reginald H. Garrett, Charles M. GrishamPublisher:Cengage Learning