A protein exists in two forms that differ only in their folded shapes. Form A is found in normal brain tissue and performs normal cellular processes. Form B is found in animals with certain brain diseases and is thought to play a causative role in these diseases. Form B is infectious, meaning that when it is introduced to normal brain tissue, it can cause Form A to be converted to Form B, thereby increasing the amount of the disease form. Based on this information and your knowledge about biology, select true or false for each of the following statements. a. Form A to Form B conversion likely requires a change in Form A's amino acid sequence.
b. Form A and Form B folding are determined entirely by their amino acid sequences.
c. Form A likely functions differently than Form B because they have different shapes.
d. Form A and Form B must be expressed from two different genes.