AAB MT Microbiology Exam Questions and Answers 100% Pass

AAB MT Microbiology Exam Questions and Answers 100% Pass What term describes the morphology of organisms that vary in shape and size? - ANSWER-Pleomorphic Capsules are the basis of which test? - ANSWER-Serotyping A mucoid colony on blood agar medium indicates that which of the following characteristics may be present? - ANSWER-Organism has a capsule. What are dark staining granules called? - ANSWER-Metachromatic Which of the following organisms are non-motile? - ANSWER-Shigella and Klebsiella In the bacterial growth cycle, growth ceases because nutrients are exhausted or toxic metabolic products have accumulated in which phase? - ANSWER-Stationary phase Which of the following genera of bacteria form spores? - ANSWER-Bacillus and Clostridium What term is used to describe bacteria that grow in the absence of atmospheric oxygen and obtain oxygen from oxygen-containing compounds? - ANSWER-Anaerobes Copyright ©SOPHIABENNETT 2025 ACADEMIC YEARALL RIGHTS RESERVED. Page 2/25 What is the temperature at which bacteria grow best known as? - ANSWER- Optimum On blood agar plates a small zone of alpha hemolysis surrounded by a zone of beta hemolysis after refrigeration is known as what type of hemolysis? - ANSWER- Alpha-prime hemolysis What is the most effective method of sterilization? - ANSWER-Autoclaving Which of the following is used for quality control for the dry heat oven? - ANSWER- Bacillus subtilis Media that cannot be heated can be sterilized by what alternate method? - ANSWER-Filtration Which one of the following disinfectants is the most effective germicide against bacteria, spores, tubercle bacilli, fungi, and viruses? - ANSWER-Chlorine What is a term that describes a process or treatment that renders a medical device, instrument, or environmental surface safe to handle? - ANSWER-Decontamination What color do gram-positive bacteria stain? - ANSWER-Purple Acid-fast bacteria appear what color microscopically? - ANSWER-Red Acid-fast organisms in tissue are best stained by which of the following methods? - ANSWER-Kinyoun Copyright ©SOPHIABENNETT 2025 ACADEMIC YEARALL RIGHTS RESERVED. Page 3/25 Which of the following should be used to remove antimicrobials before culturing? - ANSWER-Antimicrobial removal device Which statement concerning sodium polyanethol sulfonate (SPS) is NOT true? - ANSWER-Activates some antimicrobials What are some functions of sodium polyanethol sulfonate (SPS)? - ANSWER- Prevents blood from clotting, prevents phagocytosis, and neutralizes the bactericidal effect of human serum. What is the most abundant normal flora in throat cultures? - ANSWER-Alpha- hemolytic streptococci Why is it recommended to stab the blood agar plate when setting up throat cultures? - ANSWER-Some streptococci may not produce beta hemolysis under aerobic conditions. What is the most common pathogen is throat cultures? - ANSWER-Streptococcus pyogenes Nasopharangeal swabs are recommended for the detection of which carriers? - ANSWER-H. influenzae, N. meningitidis, and B. pertussis Why is a first morning urine specimen preferred for urine cultures? - ANSWER- Specimen is more concentrated. Copyright ©SOPHIABENNETT 2025 ACADEMIC YEARALL RIGHTS RESERVED. Page 4/25 What indicates vaginal or urethral contamination of urine? - ANSWER-Greater than 10 squamous epithelial cells per hpf. How are smears of cerebrospinal fluid prepared? - ANSWER-Centrifuged CSF sediment Smears of CSF are usually stained with which stain? - ANSWER-Gram stain Which of the following tests for bacterial antigen on cultures isolated from CSF is more sensitive and faster? - ANSWER-Latex agglutination tests Which of the following is not the cause of a venereal disease? - ANSWER- Haemophilus aegyptius A positive coagulase test is observed for which of the following? - ANSWER- Clotting of plasma What is the preferred method of differentiating S. aureus from S. epidermidis? - ANSWER-Coagulase test A colony of nonhemolytic, catalase-positive, coagulase negative, GPC is most likely to be which organism? - ANSWER-Staphylococcus epidermidis When performing a bacitracin differentiation test for Group A beta-hemolytic streptococci, disks should be used that have how many units?