AAB MT Microbiology Questions and answers

What term describes the morphology of organisms that vary in shape and size? correct answer: Pleomorphic Capsules are the basis of which test? correct answer: Serotyping A mucoid colony on blood agar medium indicates that which of the following characteristics may be present? correct answer: Organism has a capsule. What are dark staining granules called? correct answer: Metachromatic Which of the following organisms are non-motile? correct answer: Shigella and Klebsiella In the bacterial growth cycle, growth ceases because nutrients are exhausted or toxic metabolic products have accumulated in which phase? correct answer: Stationary phase Which of the following genera of bacteria form spores? correct 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? correct answer: Anaerobes What is the temperature at which bacteria grow best known as? correct 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? correct answer: Alpha-prime hemolysis What is the most effective method of sterilization? correct answer: Autoclaving Which of the following is used for quality control for the dry heat oven? correct answer: Bacillus subtilis Media that cannot be heated can be sterilized by what alternate method? correct answer: Filtration