BIOL 2117 Final Questions and Answers

Which of the following is an example of a noncommunicable infectious disease A. infection with a respiratory virus B. food poisoning due to a preformed bacterial toxin in food C. skin infection acquired from a dog bite infection acquired from the stick of a contaminated needle Ans- B. food poisoning due to a preformed bacterial toxin in food which of the following is a pathogen that could not be identified by the original Koch's postulates A. S. aureus B. P. aeruginosa C. HIV D. S. enetrica serovar typhimurium Ans- C. HIV Pathogen A has an ID50 of 50 particles, pathogen B has an ID50 of 1,000 particles, and pathogen C has an ID50 of 1 × 106 particles. Which pathogen is most virulent? A. pathogen A B. pathogen B C. pathogen C Ans- a. Pathogen A You have recently identified a new toxin. It is produced by a gram-negative bacterium. It is composed mostly of protein, has high toxicity, and is not heat stable. You also discover that it targets liver cells. Based on these characteristics, how would you classify this toxin? A. superantigen B. endotoxin C. exotoxin D. leukocidin Ans- C. exotoxin Which of the following applies to hyaluronidase? A. it acts as a spreading factor b. It promotes blood clotting c. it is an example of an adhesin D. it is produced by immune cells to target pathogens Ans- A Bacteria, fungi, and protozoa often use similar virulence factors and mechanisms of pathogenicity. Ans- true Sickle cell anemia can be classified as which type of disease? idiopathic infectious, communicabl