Final answer:
The head of the sperm contains the DNA, while the acrosome and midpiece play important roles in fertilization and movement.
Step-by-step explanation:
The head is the part of the sperm that contains the nucleus — and not much else. The nucleus holds the DNA of the cell and is the male parent's contribution to the genetic makeup of a zygote. The acrosome is located at the front of the head and contains enzymes that help the sperm penetrate an egg. The midpiece is packed with mitochondria that produce energy for the flagellum tail, which allows the sperm to swim through the female reproductive tract to reach an egg if one is present.