Question

Which of the following is true about antigens?

A. They are always derived from pathogens
B. They are always proteins
C. They are recognized by T and B cells
D. They must be microbial in origin
E. They usually cause cellular damage

Answer 1

Antigens are foreign molecules recognized by the immune system. They can be derived from pathogens and can be proteins, carbohydrates, or other substances. B and T cells recognize antigens and generate an immune response.

Step-by-step explanation:

Antigens are molecules that the immune system recognizes as foreign to the body. They are usually derived from pathogens and can be proteins, carbohydrates, or other substances. B and T cells recognize and respond to antigens, producing an immune response to fight against them. Antigens can be found on bacteria, viruses, cancer cells, and transplanted organs.