Part A Protein structure is directly related to the function of the protein. Which of the following is an accurate description of the level of structure in a protein? ? View Available Hint(s) Quaternary protein structure is the localized, repetitive twisting or folding of the polypeptide chain. Tertiary protein structure is the overall three-dimensional shape involving interactions between the side groups of various amino acids. Secondary structure is the unique sequence of amino acids linked together. Primary protein structure refers to the folds of the polypeptide chain that give a protein a unique three dimensional shape. Submit Provide Feedback
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The structure of a protein refers to the linear sequence of amino acids in that protein. Make up an example of the primary structure of a protein in the space below. The structure of a protein refers to the regular, recurring arrangement of the amino acid chain. One such arrangement, called the alpha helix, occurs when the amino acid chain forms a spiral coil. Draw an example of this structure in the space below. Another type of structure, called the beta sheet, consists of parallel strands of polypeptides. What types of bonds hold these sheets together? The structure of a protein refers to the specific folding and bending of the primary structure and secondary structure into coils or fibers. It is this structure that gives proteins their biological activity. In the space below, draw a representation of this level of structure. Some proteins have a structure that occurs when two or more peptides come together to form a more complex unit. In the space below, draw a representation of a protein that has a quaternary structure.
Adi S.
Given your understanding of protein 3D structure discussed in class... Select one: a. Protein primary structure is considered a linear polymer that comprises the covalent linkages between individual amino acids. At the ends of the primary structure are the N or C termini (plural for terminus). b. Secondary structure is solely formed through H-bonds that stabilize alpha helices and beta-sheets. These bonds are between R groups on each amino acid. c. Tertiary structure results in the 3D folding of your secondary structures, sometimes resulting in a functional protein. Tertiary structure is stabilized by peptide bonds, ionic bonds, H-bonds, hydrophobic interactions, or disulfide bridges. d. Quaternary structure is where distinct sections of a single polypeptide's tertiary structures fold back and interact with each other. This interaction within a polypeptide is stabilized by the same bonds as the tertiary structures. e. None of the above are true
Sri K.
Quaternary Structure Quaternary structure represents the three-dimensional (3D) structure of one functional protein. 25. The 3D quaternary structure is facilitated by interactions between which portions of the polypeptide chain? (Select one) a. Backbone atoms b. Side chains/R groups 26. List the different types of interactions that can occur at the level of quaternary protein structure. a. Covalent bonds b. Interactions between individual amino acid R groups that are near to each other in the linear sequence c. Interactions of individual amino acid R groups between different chains d. Individual amino acid R units that are separated from each other by a large distance along the linear sequence of amino acids. 27. How many polypeptide chains are present in the Quaternary structure of a protein? 28. When proteins have multiple polypeptide chains, what are the individual polypeptide chains called? 29. Find an example of a functional protein that is composed of multiple polypeptide chains (other than the example given in class). Provide the name of the protein below. 30. Draw a representation of the protein named above (in question 29). Be sure to decipher the different subunits.
Madhur L.
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