20 If you want to chemically sy UUUU 1 2 3 4 5 ou want to ch

20. If you want to chemically sy UUUU 1 2 3 4 5 ou want to chemically synthesize the short peptide Glu-Ala-Asp-Val using solid- phase synthesis, you would start with the following step: a. Glutamate with protected N-terminus is added to the solid resin. b. Valine with protected N-terminus is added to the solid resin. C. Glutamate with protected side-chain carboxylic acid is added to the solid resin. d. Glutamate with activated C-terminus is added to the solid resin. e. Valine with activated N-terminus is added to the solid resin. of the following peptide segments is most likely to be a part of a stable a-helix at physiological phr a. -Glu-Leu-Ala-Lys-Phe- b, -Tyr-Trp-Phe-Val-le- C. -Gly-Arg-Lys-His-Gly- d. -Glu-Glu-Glu-Glu-Glu- e, -Pro-Leu-Thr-Pro-Trp- 22. William Astbury discovered that the X-ray diffraction pattern of wool shows a repeating structural unit of appro along the length of the wool fiber. Choose the statement that explains the observed 5.2A length of the repeating structure the wool polypeptide a-keratin. d. The wool polypeptide a-keratin is composed of three a helices and three B sheets. The observed 5.2A spacing 15 average length of the repeating units of the a helices and the p sheets. b. The wool polypeptide a-keratin consists primarily of a-helices arranged as coiled coils, where the length of eac mplete turn of the helix is 5.2Å. c. The wool polypeptide a-keratín is composed of small hydrophobic amino acids that form tightly packed B shee gth of each repeating structural unit in the ß sheet is 5.2Å. d. The wool polypeptide a-keratin exists primarily as a B-form double helix, where the length of each complete 55.ZÁ. is the major force controlling tertiary protein structure? on pairs b. inorganic ions c. hydrophobic effect d. disulfide bonds e. hydrogen

Solution

20) anwer is option \"a\"

because the usual starting procedure for solid phase synthesis is protection of N-terminus and adding it to the resin and then deprotecting the group.

22) answer option is \"b\"

option \"b\" is correct