Microbiology Chapter 15 Exam Questions with 100% Correct Answers | Verified | Updated

Microbiology Chapter 15 Exam Questions with 100% Correct Answers | Verified | Updated Which of the following statements about M protein is FALSE? A) It is a protein. B) It is heat- and acid-resistant. C) It is readily digested by phagocytes. D) It is found on Streptococcus pyogenes. E) It is found on fimbriae. - answerC) It is readily digested by phagocytes. The most frequently used portal of entry for pathogens is the A) skin. B) parenteral route. C) mucous membranes of the respiratory tract. D) mucous membranes of the gastrointestinal tract. E) All of these portals are used equally. - answerC) mucous membranes of the respiratory tract. Bacteria that cause periodontal disease have adhesins for receptors on streptococci that colonize on teeth. This indicates that A) streptococcal colonization is necessary for periodontal disease. B) streptococci get bacterial infections. C) streptococci cause periodontal disease. D) bacteria that cause periodontal disease adhere to gums and teeth. E) bacteria that cause periodontal disease adhere to teeth. - answerA) streptococcal colonization is necessary for periodontal disease. Which of the following statements about staphylococcal enterotoxin is FALSE? A) It is a superantigen. B) It is produced by Staphylococcus aureus growing in the host's intestines. C) It is an exotoxin. D) It causes diarrhea. E) It causes vomiting. - answerB) It is produced by Staphylococcus aureus growing in the host's intestines. All of the following contribute to a pathogen's invasiveness EXCEPT A) coagulases. B) hyaluronidase. C) capsules. D) cell wall components. E) toxins. - answerE) toxins. Gram-negative septic shock results from the following events. What is the second step? A) LPS is released from gram-negative bacteria. B) Phagocytes ingest gram-negative bacteria. C) IL-1 is released. D) Body temperature is reset in the hypothalamus. E) Fever occurs. - answerA) LPS is released from gram-negative bacteria. The ability of some microbes, such as Trypanosoma or Giardia to alter their surface molecules and evade destruction by the host's antibodies is called A) cytocidal effect. B) antigenic variation. C) lysogenic conversion. D) cytopathic effect. E) virulence. - answerB) antigenic variation Injectable drugs are tested fo