Final answer:
Antibodies are proteins that play a key role in the immune response by targeting and destroying foreign substances. They help protect the body against infections.
Step-by-step explanation:
Proteins have many different functions in the body. While structural proteins make up the cytoskeleton and scaffold of cells, antibodies have a different role. The main function of antibodies is to mount an immune response against foreign substances, such as bacteria or viruses. Antibodies bind to these substances and target them for destruction, helping to protect the body against infections. For example, when we get a vaccine, our bodies produce antibodies that recognize the specific pathogen introduced in the vaccine and help us develop immunity to that pathogen.