Which statement correctly differentiates between an antigen and an antibody?

The statement that accurately differentiates between an antigen and an antibody is that an antigen is a foreign substance, and an antibody is a globular protein. Antigens are typically foreign molecules, such as pathogens (bacteria, viruses, or fungi) or substances that elicit an immune response when detected by the immune system. They are characterized by specific regions called epitopes that can be recognized by immune cells.

On the other hand, antibodies are specialized proteins produced by B cells in response to antigens. They are part of the immune system and function to identify and neutralize foreign objects like pathogens. Antibodies have a specific structure that allows them to bind effectively to their corresponding antigens.

Understanding this distinction is crucial in immunology, as it highlights the roles these two components play in the body's defense mechanisms. Antigens trigger the immune response, while antibodies mature and adapt based on the types of antigens introduced, allowing for a tailored immune response to various invaders.