Question

multiple choice 10 points
proteins are three dimensional molecules made from strands of amino acids (imagine a string of beads). there are 20 different amino acids that can be used in proteins found in living organisms. some of these amino acids are polar and others are nonpolar. in the watery cytosol of a cell, the protein folds into the three dimensional structure. where would a series of nonpolar amino acids most likely be located in a protein that is found in the cytosol of an animal cell?
○ on the surface of the protein
○ in the interior of the protein
○ at the very top of the protein
○ at the very bottom of the protein

Explanation:

The cytosol is aqueous (watery), and nonpolar substances tend to avoid water (hydrophobic effect). Polar amino acids interact with water, so nonpolar ones will be in the protein's interior to avoid the watery cytosol. The "surface" would have polar amino acids (interacting with water), and "top/bottom" are not relevant as per hydrophobic interactions guiding protein folding.

Answer:

B. In the interior of the protein