Answer: C. the sequence of amino acids that compose the polypeptide.
Step-by-step explanation:
The D choice easily throws people off, but don't worry. You can easily see D is not the correct choice once you realize that different cells don't determine what the protein looks like. What matters is not the cell type, but the DNA makeup that will ultimately create the unique sequence of amino acids that will determine how the chain folds, bonds and coils to create the specific protein and perform its specific function. So we know B and D are wrong. As I just said, it is the sequence of amino acids that determine the protein shape; lipid concentration doesn't affect the polypeptide, as proteins are made in the ribosomes, which are located at the rough ER. There isn't a high lipid concentration anyway, and the chemical makeup of lipids don't affect the natural bonds that shape a polypeptide. Hope this helps!