Innate immunity Knowledge-Based Practice

Questions

1. 1.

   Which of the following signaling molecules is released by virus-infected host cells to induce an antiviral state in neighboring uninfected cells as part of the innate immune response?

   • A) Histamine
   • B) Perforin
   • C) Type I interferon
   • D) Immunoglobulin G
2. 2.

   Which of the following chemical defenses acts as a component of the innate immune system by enzymatically cleaving peptidoglycan bonds in bacterial cell walls?

   • A) Gastric hydrochloric acid
   • B) Lysozyme
   • C) Interferon-alpha
   • D) Perforin
3. 3.

   Which of the following processes is a direct functional outcome of complement cascade activation during the innate immune response?

   • A) Secretion of antigen-specific antibodies by stimulated plasma cells
   • B) Assembly of membrane attack complexes that induce osmotic lysis of target pathogens
   • C) Somatic recombination of gene segments to generate diverse receptor repertoires
   • D) Differentiation of naive lymphocytes into long-lived memory cells
4. 4.

   Which of the following mechanisms enables cells of the human innate immune system to recognize invading pathogens without prior exposure?

   • A) Initiating somatic hypermutation to synthesize high-affinity antibodies against novel surface proteins
   • B) Undergoing clonal expansion to generate long-lived memory lymphocytes following antigen contact
   • C) Utilizing germline-encoded pattern recognition receptors to detect conserved pathogen-associated molecular patterns
   • D) Rearranging variable, diversity, and joining gene segments to create tailored antigen receptors
5. 5.

   Which of the following components of the human immune system functions as a cellular element of innate immunity rather than adaptive immunity?

   • A) Cytotoxic T lymphocytes
   • B) Natural killer cells
   • C) Memory B cells
   • D) Plasma cells

Answers and step-by-step solutions appear after you finish the test.