Which of the following is NOT a function of antibodies?

Antibodies are specialized proteins produced by the immune system that play several crucial roles in identifying and neutralizing pathogens like bacteria and viruses. One key function of antibodies is their ability to neutralize toxins, which can be harmful to cells and tissues. By binding to these toxins, antibodies prevent them from interacting with and damaging target cells.

Additionally, antibodies enhance phagocytosis, a process by which immune cells engulf and destroy pathogens. This is achieved through a mechanism called opsonization, where antibodies coat the surface of pathogens, making them more recognizable and easier for phagocytes to digest.

Another important function of antibodies is their ability to bind specifically to pathogen antigens. This binding initiates various immune responses that target the pathogens for destruction.

In contrast, promoting bacterial reproduction is not a function of antibodies. In fact, antibodies typically work to inhibit bacterial growth and replication by neutralizing toxins and marking bacteria for destruction. Thus, identifying promoting bacterial reproduction as not a function of antibodies is correct, as it goes against the fundamental role of the immune system in combating infections.