Animal Host-Pathogen Interactions MCQS January 8, 2026March 27, 2024 by u930973931_answers 20 min Score: 0 Attempted: 0/20 Subscribe 1. Which term describes a relationship between a host organism and a pathogen where the pathogen causes harm to the host? (A) Mutualism (B) Synergism (C) Commensalism (D) Parasitism 2. What is the term for a substance produced by a pathogen that triggers an immune response in the host? (A) Antigen (B) Toxin (C) Antibody (D) Enzyme 3. Which type of immune response is characterized by the production of antibodies by B cells? (A) Humoral immunity (B) Innate immunity (C) Cell-mediated immunity (D) Adaptive immunity 4. In the context of host-pathogen interactions, what does the term “virulence” refer to? (A) Ability of a pathogen to cause disease (B) Ability of a host to resist infection (C) Ability of a pathogen to replicate rapidly (D) Ability of a host to mount an immune response 5. Which of the following is an example of a vector-borne pathogen? (A) Influenza virus (B) Salmonella bacteria (C) HIV virus (D) Malaria parasite 6. Which component of the immune system provides the first line of defense against pathogens and is non-specific in nature? (A) T cells (B) B cells (C) Antibodies (D) Skin and mucous membranes 7. What is the term for the process by which a pathogen enters a host and establishes an infection? (A) Inflammation (B) Hematopoiesis (C) Immunity (D) Colonization 8. Which type of pathogen causes diseases such as athlete’s foot and ringworm? (A) Bacteria (B) Viruses (C) Fungi (D) Protozoa 9. What is the role of interferons in the immune response to viral infections? (A) They inhibit viral replication within host cells (B) They stimulate the production of antibodies (C) They promote inflammation at the site of infection (D) They activate cytotoxic T cells to kill infected cells 10. Which of the following is an example of an opportunistic pathogen? (A) Streptococcus pneumoniae (B) Candida albicans (C) Mycobacterium tuberculosis (D) Plasmodium falciparum 11. What is the term for the ability of a pathogen to evade the immune system and persist within the host? (A) Immunosuppression (B) Antigenicity (C) Pathogenicity (D) Immune evasion 12. Which type of immunity is acquired through the transfer of antibodies from one individual to another? (A) Active immunity (B) Cell-mediated immunity (C) Passive immunity (D) Humoral immunity 13. What is the primary function of cytotoxic T cells in the immune response to pathogens? (A) Production of antibodies (B) Phagocytosis of pathogens (C) Killing of infected host cells (D) Activation of B cells 14. Which of the following is an example of a zoonotic pathogen? (A) Escherichia coli (B) Influenza virus (C) Human immunodeficiency virus (HIV) (D) Salmonella bacteria 15. Which type of immune response is characterized by the activation of cytotoxic T cells to kill infected cells? (A) Adaptive immunity (B) Humoral immunity (C) Innate immunity (D) Cell-mediated immunity 16. What is the primary function of macrophages in the immune response to pathogens? (A) Production of antibodies (B) Phagocytosis of pathogens (C) Killing of infected host cells (D) Activation of T cells 17. Which of the following is an example of a protozoan pathogen? (A) Salmonella typhimurium (B) Human papillomavirus (HPV) (C) Plasmodium falciparum (D) Clostridium botulinum 18. What is the term for the process by which pathogens are engulfed and destroyed by immune cells? (A) Phagocytosis (B) Inflammation (C) Opsonization (D) Cytolysis 19. Which of the following is an example of a bacterial pathogen? (A) Hepatitis C virus (B) Plasmodium falciparum (C) Candida albicans (D) Mycobacterium tuberculosis 20. What is the role of natural killer (NK) cells in the immune response to pathogens? (A) Killing of infected host cells (B) Phagocytosis of pathogens (C) Production of antibodies (D) Activation of B cells