MT (AAB) Microbiology Q&A 2023

What term describes the morphology of organisms that vary in size and shape? - 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 the dark staining granules called? - Answer- metachromatic Which organisms are nonmotile? - 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 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 small zone of alpha hemolyisis surrounded by a zone of beta hemolysis after refrigeration is known as what type of hemolysis? - Answer- alpha-prime What is the most effective method of sterilization? - Answer- autoclaving Which of the following is used for QC in a 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 enviromental surface safe to handle - Answer- decontamination What color do Gram-positive bacteria stain? - Answer- purple Acid-fast bacteria appear what color microscopically? - Answer- red