A Level Biology Practice Exam 2025 – All-in-One Study Guide to Excel in Your A Levels!

T lysosomes play a crucial role in the immune system primarily by destroying pathogens. These organelles contain digestive enzymes that can break down foreign substances, including bacteria and viruses, that invade the body. This process is essential for the immune response, as it helps to eliminate potential threats and prevent infections. Lysosomes fuse with phagosomes, which are vesicles containing engulfed pathogens, and their enzymes digest the materials, ultimately leading to the degradation of the pathogens.

The function of lysosomes in this context is vital for maintaining the body’s health and safety, as they help to clear out harmful agents without causing damage to surrounding tissues. This mechanism is a key part of the innate immune response, contributing to the overall defense strategy of the body against infections.

Other options like producing antibodies, storing energy, or facilitating communication among cells do not accurately describe the primary function of lysosomes in the immune system. While other cells, like B cells, are responsible for antibody production, and while cells communicate in various ways, lysosomes are specifically not involved in those processes.