Immune System Quiz

Which of the following is a primary lymphoid organ?

• Spleen

• Lymph node

• Bone marrow

• MALT

What is the major function of B cells?

• Phagocytosis

• Antibody production

• Killing virus-infected cells

• Producing histamine

Which type of immune cell is the first to respond to infection and is most abundant in the blood?

• Basophils

• Eosinophils

• Neutrophils

• Macrophages

Which of the following cells is considered a professional antigen-presenting cell?

• Neutrophil

• Natural Killer cell

• Dendritic cell

• Eosinophil

Which immune cell uses the NADPH oxidase complex to generate reactive oxygen species?

• Eosinophils

• NK cells

• Neutrophils

• Macrophages

Which statement best describes T-helper (CD4+) cell function?

• They kill tumor cells directly

• They suppress autoimmune responses

• They help activate B cells, macrophages, and CD8+ T cells

• They produce antibodies

Which statement about NK cells is incorrect?

• They are part of adaptive immunity

• They kill virus-infected cells

• They are innate immune cells

• They can kill tumor cells

Which feature is most characteristic of neutrophils?

• Bilobed nucleus and eosinophilic granules

• Circular nucleus and smooth surface

• Multilobed nucleus with ROS production capability

• Large round nucleus and antigen presentation

Which of the following best describes a function of the immune system?

• Producing hormones for metabolism

• Regulating blood pressure

• Distinguishing self from non-self to prevent autoimmunity

• Synthesizing red blood cells

What is the central component of all complement activation pathways?

• C1

• C3

• C5

• C9