Answer:
The structure that carries the instructions is: Gene.
Step-by-step explanation:
When we think of the protein making process, we can guarantee that this answer is correct. Let's see, the process starts with a polimerase RNA reading a single ribbon of DNA and making with that a mRNA, this mRNA is then transported outside of the cell to make the protein and continue the process, in the end, the protein will fulfill its own function in the body. By that, we can see that the characteristics are going to be on the genes (DNA), that will be read by the pRNA to make the curly hair, for example.
Remember, mRNA will not carry the same nucleotides as the ribbon of DNA, but they still complement themselves. (thymine is replaced by uracil in this case).