Pathogens and defense Knowledge-Based Practice

Questions

1. 1.

   Which group of plasma proteins circulating in an inactive state is activated in a biochemical cascade to lyse invading pathogens by forming membrane attack complexes?

   • A) Immunoglobulins
   • B) Interleukins
   • C) Complement proteins
   • D) Perforins
2. 2.

   Which group of signaling proteins is released by virus-infected host cells to inhibit viral replication in neighboring healthy cells?

   • A) Perforins
   • B) Immunoglobulins
   • C) Interferons
   • D) Histamines
3. 3.

   Which type of immune cell is directly responsible for producing and secreting circulating antibodies to neutralize extracellular pathogens?

   • A) Helper T cells
   • B) Plasma cells
   • C) Dendritic cells
   • D) Basophils
4. 4.

   Which type of immune cell directly recognizes and destroys host cells that have been infected by intracellular pathogens such as viruses?

   • A) Helper T cells
   • B) Cytotoxic T cells
   • C) Plasma cells
   • D) Memory B cells
5. 5.

   Which of the following serves as a non-specific chemical barrier that defends the human body by breaking down bacterial cell walls?

   • A) Production of antigen-specific antibodies by activated B lymphocytes
   • B) Release of perforin and granzymes by cytotoxic T cells to trigger apoptosis
   • C) Secretion of lysozyme in tears and saliva to hydrolyze bacterial peptidoglycan
   • D) Generation of immunological memory through the differentiation of memory cells

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