Antigen is a substance which:
✓ Correct answer: d) stimulates formation of antibody
ExplanationAntigens are recognized by the immune system as foreign substances, which stimulates the production of specific antibodies by B-cells (a type of white blood cell).Antibodies bind to antigens, marking them for destruction by other immune cells or neutralizing their harmful effects.Antigens can be proteins, polysaccharides, or lipids.For example, the spike protein of the SARS-CoV-2 virus acts as an antigen, triggering an immune response and the production of antibodies in infected individuals or after vaccination.The immune response involves two types of lymphocytes:1. B-cells produce antibodies that target antigens.2. T-cells destroy infected cells displaying antigens.475
Practice more Science PYQs
Attempt a free 10-question quiz or browse the full Science & Technology previous-year-question bank with instant answers and explanations.
🔬 Science PYQs →