Multiple Choice QuestionThe structure of a sperm that forms over the nucleus is the ______.Multiple choice question.midpiecetailacrosome cap

The structure of a sperm that forms over the nucleus is the acrosome cap.

Explanation:

The acrosome is a specialized organelle that covers the anterior half of a sperm's nucleus. It is crucial for fertilization because it contains enzymes that help the sperm penetrate the outer layers of the egg. These enzymes, including hyaluronidase and acrosin, play a vital role in breaking down the protective barriers surrounding the ovum. The acrosome develops from the Golgi apparatus during the maturation of the sperm, and its importance is emphasized in the process of capacitation, where the sperm becomes capable of successful fertilization. In contrast, the midpiece of the sperm primarily contains the mitochondria that provide energy for the motility of the sperm, while the tail (flagellum) is essential for locomotion.

In summary, the correct answer is acrosome cap.