AAB MT Microbiology Questions And Answers Solved 100% Correct

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 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 subtilisMedia 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 Which of the following should be used to remove antimicrobials before culturing? - AnswerAntimicrobial 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 pyogenesNasopharangeal 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. 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