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18 Nov 2019
On a separate sheet of paper answer the following questions from Chapter 6 in the textbook 8, 9, 12, 15, 23, 24 8) Explain why gelatin, which is mostly collagen, is nutritionally inferion to other types of proteins. 9) Globular proteins are typically constructed from several layers of secondary structure, with a hydrophobic core and a hydrophylic surface. Is this true for a fibrous protein such as -keratin? 2) Briefly explain your answers for the following questions. a)Is Trp or Gln more likely to be on a protein's surface? b) Is Ser or Val less likely to be in a protein's interior? c) Is Leu or Ile less likely to be found in a middle of an -helix? d) Is Cys or Ser more likely to be in a 0-sheet? 15) You are performing site-directed mutagenesis to test predictions about which residues are essential for a protein's function. Which of each pair of amino acid substitutions listed below would you expect to disrupt protein structure the most? Explain. a) valine replaced by either alanine or phenylalanine b) lysine replaced by either aspartate or arginine c) glutamine replaced by either glutamate or asparagine d) proline replaced by either histidine or glycine 23) Which of the polypeptide chains below is most likely to form an D- helix? Explain a) CRAGNRKIVLETY b) SEDNFGAPKSILW c) QKASVEMAVRNSG 24) Which polypeptide chain in problem 23 would most likely to form a 0-strand? Explain
On a separate sheet of paper answer the following questions from Chapter 6 in the textbook 8, 9, 12, 15, 23, 24 8) Explain why gelatin, which is mostly collagen, is nutritionally inferion to other types of proteins. 9) Globular proteins are typically constructed from several layers of secondary structure, with a hydrophobic core and a hydrophylic surface. Is this true for a fibrous protein such as -keratin? 2) Briefly explain your answers for the following questions. a)Is Trp or Gln more likely to be on a protein's surface? b) Is Ser or Val less likely to be in a protein's interior? c) Is Leu or Ile less likely to be found in a middle of an -helix? d) Is Cys or Ser more likely to be in a 0-sheet? 15) You are performing site-directed mutagenesis to test predictions about which residues are essential for a protein's function. Which of each pair of amino acid substitutions listed below would you expect to disrupt protein structure the most? Explain. a) valine replaced by either alanine or phenylalanine b) lysine replaced by either aspartate or arginine c) glutamine replaced by either glutamate or asparagine d) proline replaced by either histidine or glycine 23) Which of the polypeptide chains below is most likely to form an D- helix? Explain a) CRAGNRKIVLETY b) SEDNFGAPKSILW c) QKASVEMAVRNSG 24) Which polypeptide chain in problem 23 would most likely to form a 0-strand? Explain
Collen VonLv2
28 Sep 2019