Chapter 4 Answers - Bio2600 Study Guide Chapter 4 Answers...

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51 Bio2600 Study Guide – Chapter 4 Answers 4-1 Choice (c) is the answer. Choice (a) is untrue, as some proteins also contain covalent disulfide bonds (–S–S– bonds) linking two amino acids. Choice (b) is untrue, as the peptide bond is rigid. Choice (d) is untrue, as the sequence of atoms in the polypeptide backbone itself is always the same from protein to protein; it is the order of the amino acid side chains that differs. Choice (e) is untrue, as a protein chain has a carboxyl group at its C-terminus. 4-2 (b) Since a protein’s three-dimensional structure is determined by its amino acid sequence, proteins with similar amino acid sequences will often have very similar shapes. 4-3 (d) 4-4 (d) 4-5 The quantity 20 10 = approximately 10 13 . 4-6 A. (A) is parallel and (B) is antiparallel B. See Figure A4-11. Figure A4-11 4-7 (b) 4-8 (d)
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52 4-9 A—F; B—G; C—F; D—F; E—G; F—G 4-10 (d) False. Most proteins need to release their ligand at some point. For example, hemoglobin would be useless as a carrier of oxygen if it never released the oxygen to the tissues that need it. In addition, enzymes could not be catalysts if they did not release the product after its formation from substrate.
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