Which one of the following statements is CORRECT? O The B-sheet is stabilized by ionic interactions between the side chains of amino acids. O The a-helix can be composed of more than one polypeptide chain. O The a-helix is stábilized by hydrogen bonds between C=O and -NH- of the peptide backbone. O B-sheets exist only in fibrous proteins.
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- Below is the structure of glycine. Draw a tripeptide composed exclusively of glycine. Label the N-terminus and C-terminus. Draw a box around the peptide bonds.Which of the following statements concerning the peptide NH3*-Val-Ala-Gly-Lys-Leu-Gly-Val-Phe- Tyr-lle-COOH is correct? O The peptide can form an alpha-helical secondary structure O The peptide can form a beta-pleated sheet O The last amino acid residue is Val. O Three peptide linkages are present.It is often the case that a helices are positioned in a protein such that one side faces the interior of the protein and the other, the surface of the protein. These are said to be amphiphilic helices because they face different environments. Using a helical wheel projection (shown below), which of the peptide(s) below might form an amphiphilic helix? 8 15 1 12 4 11 16 18 9 7 14 13 10 17 O SLIKSVIEMVDEWFRTFL O FLIRVLRKVFRVLTRILS O RLFRSRVLKIAVIRFLLI
- Which of the following best describes how the secondary structure of a protein is formed? A B с D O=U a-helix H O=C N-H R-C-H C=0 H-N H-C-R O=C N-H R-C-H C=O H-N O-C N-H R-C-H C=O H-N N-H 0= H-C-R H-N C=O R-C-4 N-H O=C H-C-R 4-1 Ç=O R-C-H N-H 0=C H-C-R (=O R-C-H B-pleated sheet ionic bonds between the R groups of the polypeptide amino acids -Uh hydrogen bonds between the carboxyl and amino groups of non-adjacent amino acids covalent bonds between the carboxyl and amino groups of adjacent amino acids hydrogen bonds between the R groups of the polypeptide amino acidsA peptide has the sequence Gly-Ser-Lys-Ala-Gly-Gly-Arg-Ser-Arg. How many fragments would result from cleaving the sequence with trypsin? number of fragments: 3 Draw the smallest fragment at pH 7. + H₂N H O OH ZH N O _.. NH ₂Which statement best describes the protein structure shown below? This is an alpha helix. This is a tertiary structure that consists almost entirely of beta strands. This is a tertiary structure consisting of a roughly equal mixture of alpha helices and beta sheets. This is a beta sheet. This is a tertiary structure that consists almost entirely of alpha helices.
- The pi-helix is a rare secondary structural element in proteins that resembles an alpha helix but has slightly different properties. Notably, hydrogen bonds within a pi-helix display a repeating pattern in which the backbone C=O of residue i hydrogen bonds to the backbone HN of residue i+5. Based on this information, which of the following are true? Select all that apply. O The hydrogen bonding distance between C=O and NH groups remains unchanged between pi-helices and alpha-helices The torsion angles of amino acids found in pi-helices are the same as those found in alpha-helices Pi-helices have a smaller rise per residue compared to alpha- helices Pi-helices have fewer residues per turn compared to alpha-helices Pi-helices have more residues per tůrn compared to alpha-helices Pi-helices are left handedWhich of the following statements about alpha-helix and beta-sheet structure are true? More than one answer is correct. -they are aspects of protein secondary structure. -they are maintained by hydrogen-bonding interactions within the polypeptide backbone. -most proteins fall into one of two categories: those composed entirely of alpha-helix, and those composed entirely of beta-sheet. -in both alpha-helix and beta-sheet, each amino acid (at position n) interacts with another amino acid at position n+4. -alpha-helix contains only hydrophobic amino acids, while beta-sheet contains only hydrophilic amino acids. More than one answer is correct I am confusedThe different types of interactions that stabilize the protein tertiary structure are illustrated in the diagram below. Which type of interaction moves some part of the polypeptide chain toward the inside of the folded protein? OH Hydrophilic OH CH₂ interaction with water Hydrogen bond -NH₂3-0- C Salt bridge -CH₂-OH C=0 H-N H 0-CH,- I H Hydrogen bond Salt bridge O Disulfide bond 222 -SIS Hydrophobic interaction 200 O Hydrogen bond O Hydrophilic interaction Disulfide bonds B-Pleated sheet O Hydrophobic interaction CH₂ CH₂ a Helix CH3 CH3 Hydrogen bonds
- Which of the following statements are true? The local folding of the polypeptide in some regions gives rise to the secondary structure of the protein. The most common secondary structures are the α-helix and β-pleated sheet structures. Certain amino acids have a propensity to form an α-helix, while others have a propensity to form a β-pleated sheet. Select the correct answer below: 1 and 2 1 and 3 2 and 3 all of the aboveWhich of the following peptides will likely adopt an alpha helix? H-I-R-E-F A-D-L-E-E A-D-E-L-E C-V-D-E-FIn the following polypeptide, which amino acid would be participating in hydrogen bonding with alanine, given this sequence forms an alpha helix? Please write out the full amino acid name, not the abbreviation. Met-Ala-Leu-Glu-Lys-Thr-Leu-Val
