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- Describe the four levels of protein structure. How do a proteins side groups influence its interactions with other substances? What happens when a protein is denatured?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 is NOT TRUE about secondary structure in proteins? (More than one may apply) A. Stabilized by non-covalent bonds B. Is illustrated by DnaA molecules interacting in the ori C. Unravels at high temperatures when intramolecular non-covalent bonds are destroyed D. Occurs in a subregion of a protein E. Exemplified by beta sheets F. Describes the order of amino acids in a polypeptide
- Which of the following statements are correct about the native state of a protein (select all that apply)? A. Polar sidechains commonly interact with water B. Hydrophobic amino acids tend to be on surface of protein C. The sidechains of polar amino acids are most commonly found in the central core of a protein D. Formation of an alpha-helix is primarily driven by hydrogen bonds between the protein main chain, not sidechains. E. Secondary structure is largely driven by hydrophobic interactionsProteins undergo  a process, called folding to establish their final, functional configuration. Amino acids them selves are covalently, bound to gather, but for other forces are needed to maintain a functional proteins structure. Briefly describe these forces.Which of the following statements are correct about protein structure (select all that apply)? A. Post-translational modifications such as glycosylation or phosphorylation may alter the structure of a protein B. Only amino acids with a net charge may interact with other amino acids C. The 3D structure of a protein is determined primarily by the protein backbone/main chain conformation while the amino acid sidechains play only a minor role. D. Hydrophobic interactions play a key role in protein folding E. Amino acid sidechains contribute to 3D structure through their ability to form hydrogen bonds with other amino acids
- Which levels of protein structure are determined by primary structure mark all that apply 1. secondary structure (alpha helices and/or beta sheets) 2. tertiary structure (the folded, three-dimensional shape of a protein) 3. amino acids 4. peptide bondsWhich of the following statement about quaternary structure of protein is correct? Select one: a. Quaternary structure is a force between different polypeptides. b. Hydrogen bond is an only force found in quaternary structure. c. Quaternary structure contains one polypeptide. d. Quaternary structure is an unfolded form of protein.Proper folding is essential for most proteins to function. Which of the following statement about protein folding are correct. There may be more than 1 right answer. a) changing the primary sequence will change the final conformation b) desaturation results in a protein that has a higher free energy than the native conformation c) protein spontaneously fold into their correct shape d) denatrutation will cause a protein to lose its tertiary structure
- Which of the following statements is/are TRUE for globular proteins? A. sensitive to changes in pH & heat B. regular amino acid sequence C. soluble in water D. structural roleWhat level of protein structure is determined by the following:(a) Peptide bonds between amino acids?(b) Hydrogen bonds between backbone carbonyl oxygen atoms and hydrogen atoms attached to backbone nitrogen atoms?(c) R group interactions that may involve Van der Waalsforces, ionic interactions, or hydrogen bonds?The tertiary structure of a protein is the : A) overall protein structure resulting from the aggregation of two or more polypeptide subunits. B) order in which amino acids are joined in a polypeptide chain. C) bonding together of several polypeptide chains by weak bonds. D)organization of a polypeptide chain into an α helix or β pleated sheet. E)unique three-dimensional shape of the fully folded polypeptide.