AAB MT Microbiology 215 questions
with 100% correct answers
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
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
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.
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
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