Question

question 15 of 25
hemoglobin is a protein involved in oxygen transport. myosin is a protein
found in muscles. which sentence describes these proteins?
a. they have the same amino acid sequence and are just folded
differently.
b. they can change their structures when the body needs more of a
different type of protein.
c. they can swap their functions when the body requires it.
d. their structures are based on the amino acid sequences in their
polypeptides.

Explanation:

Proteins like hemoglobin and myosin have structures determined by amino - acid sequences. Different amino - acid sequences lead to different functions (so A is wrong as they don't have the same sequence). Proteins have specific structures for their functions and don't change structures or swap functions as described in B and C. The structure of a protein (including its folding) is fundamentally based on the amino - acid sequence in its polypeptide chain (which is what D states).

Answer:

D. Their structures are based on the amino acid sequences in their polypeptides.