The correct response is:
No, different sections of the cells' DNA are "tuned on" causing heart cells to have different characteristics from brain cells.
Heart cells (cardiomyocytes) and brain cells (neurons and glial cells) have different functions and characteristics because they express different subsets of genes that dictate their structure and function. Although all cells in the body contain the same DNA, the specific genes that are activated or "turned on" determine the type of cell and its role in the body.