1. Which of the following best explains why an individual's nerve cell has a different structure and function compared to that individuals white blood cell?

(A) The two cells have different nucleotide sequences in their chromosomes
(B) The genome of the nerve cell is different than the genome of the white blood cell
(C) The nerve cell's DNA experienced different mutations during embryonic development
(D) The two cells express tissue-specific proteins as a result of differential gene expression