Quiz microbiology 28 oct 2025

Which of the following best represents the main function of the immune system?

• Hormonal regulation

• Elimination of non-self and abnormal cells

• Enzyme activation

• Oxygen transport

• Neural transmission

Which feature differentiates innate from adaptive immunity?

• Memory formation

• Antigen specificity

• Immediate non-specific response

• Dependence on antibodies

• Requires prior exposure

Which cells are the first responders in acute bacterial infection?

• Lymphocytes

• Eosinophils

• Neutrophils

• Basophils

• NK cells

Which leukocyte secretes interleukin-1 to induce fever?

• NK cell

• Monocyte/macrophage

• Basophil

• Eosinophil

• B cell

Which immune cell type is resident in the epidermis and functions as an antigen-presenting cell?

• Kupffer cell

• Langerhans cell

• Microglia

• Osteoclast

• Alveolar macrophage

Which innate mechanism directly lyses microbes?

• Cytokines

• Complement system

• Antibodies

• Histamine

• Interleukin-2

A defect in perforin formation would impair which cell’s function?

• Cytotoxic T cells

• Neutrophils

• NK cells

• Macrophages

• Mast cells

Which substance found in tears and saliva destroys bacterial cell walls?

• Lysozyme

• Histamine

• Complement C5

• Interferon

• Cytokine

Which mechanical factor protects the respiratory tract?

• Ciliary movement

• Gastric acid

• Low pH of sweat

• Complement

• Urea excretion

Which immune cell links innate and adaptive immunity by antigen presentation?

• Dendritic cell

• Neutrophil

• Eosinophil

• NK cell

• Basophil