Which of the following features correctly describe aspects of protein structure? a) A protein possessing disulfide bonds will be more stable than a protein with the identical primary sequence lacking disulfide bonds. O b) B-sheets can only be formed from the anti-parallel arrangement of B-strands. O c) Folding of a protein (tertiary structure) will typically result in a majority of the non-polar amino acids being distributed on the protein surface. d) both a and c

Which of the following, if any, is correct about protein folding? a)2° structure formation is primarily entropic, 3° structure formation is primarily entropic b)2° structure formation is primarily entropic, 3° structure formation is primarily enthalpic c)2° structure formation is primarily enthalpic, 3° structure formation is primarily entropic d)2° structure formation is primarily enthalpic, 3° structure formation is primarily enthalpic e)None of the above

Describe the 4 levels of protein structure: primary, secondary, tertiary and quaternary. And, note which will be disrupted by application of heat.

Protein structures have several different levels of organization. In the space below indicate the type of molecular bonds that can contribute to each level of organization: primary-  secondary- tertiary- quarternary-

The tertiary structure of a protein is the 3-dimensional folding of the polypeptide chain. What types of bonds support the folding of proteins into this level of protein structure? Also, how do these bonds/interactions impact how a protein folds and its surface properties? Can the tertiary structure of a protein depend on the type of cell system used for synthesis? Explain.

Which of the following is an example of secondary protein structure?A) DipeptideB) TriglycerideC)α -helixD) Amino acidE) Fatty acid

A) Briefly describe the basic structure of phospholipids and explain how they can provide an effective barrier against the unregulated movement of molecules into or out of cells. B) Not all phospholipids are identical to one another. Describe two components (parts) of that can be altered to create variation between different phospholipids.

3. Which best describes the contribution of tertiary (3’) structure of to the native conformation of polypeptides and proteins: a) Structure that results from intrachain interactions of amino acid side chains b) Structure that results from interchain interactions of amino acid side chains c) Structure that results from base pairing d) Structure that results from the linear sequence of amino acids from beginning to end of molecule

The following diagram shows a short piece of a protein. Use the diagram to answer the following questions. A. What three amino acids are present in the segment? B. How many peptide bonds are present? C. Which amino acid is at the N terminus?

A mutation leads to a change in amino acid from valine, an amino acid with a nonpolar side chain, to aspartic acid, an amino acid with a polar, negatively-charged side chain. Do you think that the following levels of protein structure change? If so, how and why? If not, why not? Please frame your answer in terms of chemical bonds and interactions. (primary structure, secondary structure, tertiary structure, quartenary structure)