Immunity Quiz

Which of the following is not a physical barrier of the innate immune system?

• Skin

• Mucus

• Lysozyme

• Cilia

The most important step in the complement activation pathway is:

• Activation of C9

• Formation of antigen-antibody complex

• Cleavage of C3

• Activation of CD4+ T cells

Which antibody class is the major component in mucosal secretions?

• IgG

• IgE

• IgA

• IgM

Which immune cell is primarily responsible for killing virus-infected cells during the innate response?

• Helper T cell

• Plasma cell

• Natural Killer (NK) cell

• B cell

Which of the following best describes active immunity?

• Transfer of antibodies from mother to fetus

• Immune response generated after vaccination

• Injection of immune globulin

• Genetic resistance to infection

All of the following are true about adaptive immunity except:

• It has memory

• It is antigen-specific

• It is immediate

• It involves T and B cells

Which organ is a primary lymphoid organ?

• Spleen

• Tonsil

• Lymph node

• Thymus

What is the function of perforins in NK cells?

• Tagging pathogens

• Enhancing inflammation

• Forming pores in target cells

• Promoting antibody production

A child receives antibodies through breast milk. This is an example of:

• Naturally acquired active immunity

• Artificially acquired active immunity

• Naturally acquired passive immunity

• Artificially acquired passive immunity

What is the role of C3b in the complement cascade?

• Induces fever

• Triggers apoptosis

• Enhances phagocytosis (opsonization)

• Destroys red blood cells