During the process of fertilization, which step happens first?

Explanation

The first step of fertilization where the sperm recognizes and binds to specific receptors on the egg cell membrane. This binding triggers various reactions in both the sperm and the egg. After binding, the sperm releases enzymes that help to break down the protective layer surrounding the egg cell, known as the zona pellucida. This breakdown allows the sperm to penetrate the egg cell membrane. Once the protective layer is breached, the sperm can then enter the egg cell. The sperm's nucleus, containing its genetic material, is released into the egg cell cytoplasm. Following the entry of the sperm's nucleus, the egg cell membrane undergoes changes to prevent the entry of additional sperm, ensuring that only one sperm fertilizes the egg.