Question

What are antibodies?

A. leukocytes that ingest foreign microorganisms
B. a type of white blood cell in the immune system
C. cells that release toxins to destroy pathogens
D. proteins that tag antigens for destruction by immune cells​

Answer 1

D

a blood protein produced in response to and counteracting a specific antigen. Antibodies combine chemically with substances which the body recognizes as alien, such as bacteria, viruses, and foreign substances in the blood.