Question

1. Amino acids are considered to be either hydrophobic or hydrophilic as described by the relative polarity of their side chain. Consider a folded protein in an aqueous environment; where would the hydrophobic amino acids likely be found?

-Tucked away in the middle of the folded protein

-Randomly distributed throughout the protein

-Exposed on the exterior surface of the folded protein

2. All proteins exhibit a primary, secondary, and tertiary structure, but not all proteins exhibit a quaternary structure. Describe what a quaternary structure is, and why not all proteins exhibit this form of higher-order structure.

-A quaternary structure is the folding of the peptide backbone into a three-dimensional conformation. Not all proteins exhibit this type of structure because their backbone is rigid and thus cannot fold.

-A quaternary structure is the incorporation of two or more polypeptide subunits into one functional complex. Not all proteins exhibit a quaternary structure because not all proteins are comprised of two or more distinct subunits

- A quaternary structure is sequence of amino acids in the polypeptide chain. All proteins exhibit quaternary structure.

-A quaternary structure is the interaction of amino acid side chains. The statement is false- all proteins exhibit a quaternary structure.

Answer 1

1. The Hydrophobic Amino Acids would be Tucked Away in the middle of the folded protein.

2. A quarternary structure is the incorporation of two or more polypeptide subunits into one functional Complex. Not all proteins exhibit a quarternary structure because not all Proteins are comprised of two or more distinct subunits.