How does the proteome differ from the genome?

A: The proteome changes in response to intracellular and extracellular signals.

B: The genome changes in response to intracellular and extracellular signals.

C: The proteome is stable in somatic cells and unstable in germ cells, whereas the genome is stable in both somatic cells and germ cells.

D: The genome is stable in somatic cells and unstable in germ cells, whereas the proteome is stable in both somatic cells and germ cells.