Question 13 About the protein structure: |A The primary structure of a protein corre- sponds to its sequence and is always writ- ten from its C-terminus to its N-terminus. B The secondary structures of a protein are formed by hydrophobic bonds between the different atoms of the main chain. |C The quaternary structure of a protein in- volves only covalent bonds established be- tween the different peptide chains. D] The tertiary structure of a protein in- volves, among other things, hydrogen and ionic bonds between the side chains of the different amino acid residues. E None of the above statements is right.

Question 13 About the protein structure: |A The primary structure of a protein corre- sponds to its sequence and is always writ- ten from its C-terminus to its N-terminus. B The secondary structures of a protein are formed by hydrophobic bonds between the different atoms of the main chain. |C The quaternary structure of a protein in- volves only covalent bonds established be- tween the different peptide chains. D] The tertiary structure of a protein in- volves, among other things, hydrogen and ionic bonds between the side chains of the different amino acid residues. E None of the above statements is right.

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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Question 19 Based on the hydropathic index plot below, where in the 3D structure of the protein would you expect to find amino acid number 185? 40 Hydrophobic 20 -20 -40 Hydrophilic 40 60 80 100 120 140 160 180 200 220 240 Residue number Alpha helix Beta sheet O Double helix O Quaternary contact O Interior of the protein O Surface of the protein Hydropathic index 20
QUESTION 25 Phosphorylation, acetylation, methylation, and ubiquitylation are all ways to: Regulate carbohydrates using small molecules O Turn on and off the activity of proteins O Remove amino acids from proteins O Join proteins together
QUESTION 21 Which of the following would be most atable based on the information you have learned about protein structure? OA op region with a amino acids O B.apsheet region made up of amino acids Val, le, Phe All have equal ntability OD. an a helix made up of Cys, Pro, and Phe E. aß hairpin with 12 amino acide
Question 12 In the tertiary structure of a protein, the R-group of valine can interact with the R-group of via a _ O leucine; hydrophobic interaction O lysine, electrostatic interaction O threonine, hydrogen bond alanine; hydrogen bond
Question 5 An a-helix has the sequence: NH3-Ser-Glu-Gly-Asp-Trp-Gln-Leu-His-Val-Phe-Ala-Lys-Val-Glu- COO-. The carbonyl oxygen (in the peptide bond) of the W5 residue is hydrogen bonded to the amide nitrogen of H8 E2 O V9 O S1
QUESTION 10 In the deoxy state of HB, which of the following does not occur? O An intra-chain salt bridge between Val 98 and Tyr 145. O An intra-chain salt bridge between Histidine 146 and Aspartate 94 side chains O A peptide bond between Tyr 145 and His 146. O An inter-chain salt bridge between Histidine 146 and Lys 40
Question 5 The core protein of a proteoglycan is noncovalently attached to: O oligosaccharides. glycosaminoglycans O keratin sulfate. O hyaluronic acid backbone
Question 51 The direct sequence of amino acids as dictated by DNA is the O quaternary primary secondary O tertiary structure of a protein.
Question 14 If two proteins have the same sequence of amino acids, which type of protein structure must they have in common? O Primary structure O secondary structure O Quaternary structure O tertiary structure
Question 16 Which of the following statements is NOT true regarding the comparison of the alpha-helix structure to the beta-sheet structure in proteins? O The peptide bond in each is planar and trans O Each is stabilized by inter-chain hydrogen bonds O All possible hydrogen bonds between the peptide carbonyl oxygen (C=O) and the amide hydrogen (N-H) are formed in each O Each may occur in typical globular proteins O Each is an example of secondary structure
Question 30 Hydrogen bonds that form a helices and B-pleated sheets are the primary interaction in which level of protein structure? secondary O quaternary primary tertiary
Question 12 What is the net charge of peptide Ala-Gly-Lys-Tyr at a pH of 1.0? O a. 0 O b. +2 O C. -1 O d. +1 A Moving to another question will save this response.