AMT MLS Domain 8: Microbiology Welcome to your AMT MLS Domain 8: Microbiology 1. AMT MLS: Microbiology Which of the following bacterial species is known to produce a red pigment at room temperature and is a common contaminant in laboratory environments? Staphylococcus aureus Serratia marcescens Escherichia coli Pseudomonas aeruginosa None 2. AMT MLS: Microbiology In the identification of Mycobacterium tuberculosis using the niacin accumulation test, what is the significance of a positive result? Indicates the presence of cell wall lipids Demonstrates niacin production Confirms mycolic acid synthesis Suggests protein synthesis inhibition None 3. AMT MLS: Microbiology Which of the following organisms is a gram-positive rod that can cause food poisoning and is also known for its ability to grow at refrigeration temperatures? Salmonella typhi Clostridium botulinum Listeria monocytogenes Vibrio parahaemolyticus None 4. AMT MLS: Microbiology Which of the following is the most appropriate media for the primary isolation of Campylobacter jejuni from stool samples? MacConkey Agar Blood Agar Thiosulfate-citrate-bile salts-sucrose (TCBS) agar Campylobacter-selective agar (e.g., Preston or Skirrow) None 5. AMT MLS: Microbiology When differentiating between Staphylococcus aureus and Staphylococcus epidermidis, which test is crucial? Catalase test Coagulase test Oxidase test Urease test None 6. AMT MLS: Microbiology In the context of antimicrobial susceptibility testing, what does the term "Minimum Inhibitory Concentration" refer to? The lowest concentration of an antimicrobial that will inhibit the visible growth of a microorganism after overnight incubation The highest concentration of an antimicrobial that a microorganism can resist The concentration of an antimicrobial required to kill a microorganism The amount of an antimicrobial that results in bactericidal activity None 7. AMT MLS: Microbiology Which organism is responsible for causing diphtheria, and what is the key virulence factor? Corynebacterium diphtheriae; diphtheria toxin Streptococcus pyogenes; M protein Haemophilus influenzae; capsule Bordetella pertussis; pertussis toxin None 8. AMT MLS: Microbiology In laboratory identification, what is the primary purpose of using a bile esculin test? To distinguish between Enterococcus and Streptococcus species To identify members of the genus Salmonella To differentiate lactose-fermenting from non-lactose-fermenting enteric bacteria To detect the presence of capsule in bacteria None 9. AMT MLS: Microbiology Which of the following statements accurately describes the Quellung reaction? It is used to differentiate between types of hemolysis on blood agar. It involves the swelling of the capsule of bacteria when specific antibodies are present. It distinguishes between gram-positive and gram-negative bacteria. It identifies bacterial species based on their motility. None 10. AMT MLS: Microbiology What is the significance of detecting beta-lactamase production in bacteria? It indicates the ability of the bacterium to ferment lactose. It suggests the bacterium can resist beta-lactam antibiotics through enzyme production. It signifies the ability of the bacterium to produce lactic acid. It demonstrates the bacterium's capacity for aerobic respiration. None 11. AMT MLS: Microbiology When considering fungi, which of the following is a dimorphic fungus associated with bird and bat droppings and can cause pulmonary infections? Candida albicans Histoplasma capsulatum Aspergillus fumigatus Cryptococcus neoformans None 12. AMT MLS: Microbiology Which of the following is the gold standard test for diagnosing Clostridioides (formerly Clostridium) difficile infection? Stool culture Enzyme immunoassay for toxins Nucleic acid amplification test (NAAT) Gram staining of stool None 13. AMT MLS: Microbiology What is the primary reason for performing a D-test in clinical microbiology? To detect the presence of an inducible clindamycin resistance in staphylococci and streptococci To determine the minimum inhibitory concentration (MI of an antibiotic C) To identify the bacterial species based on DNA sequencing To assess the bactericidal activity of an antibiotic None 14. AMT MLS: Microbiology Why is the detection of galactomannan considered significant in diagnosing invasive aspergillosis? It indicates the presence of Aspergillus species antigens in body fluids. It confirms the bacterial origin of a pulmonary infection. It detects the enzymatic activity of Aspergillus in the host. It identifies the specific species of Aspergillus causing the infection. None 15. AMT MLS: Microbiology In the laboratory, what is the significance of detecting "safety pin" appearance in Yersinia pestis under a microscope? It indicates the presence of a capsule. It signifies the bacterium's resistance to antibiotics. It reveals the characteristic bipolar staining of the organism. It demonstrates the organism's ability to produce toxins. None 1 out of 15 Time is Up! Time's up
