AAB MT Microbiology Exam 2025 With
100% Correct Answers
What term describes the morphology of organisms that vary in shape and size? - correct
answers ✔✔Pleomorphic
Capsules are the basis of which test? - correct answers ✔✔Serotyping
A mucoid colony on blood agar medium indicates that which of the following characteristics
may be present? - correct answers ✔✔Organism has a capsule.
What are dark staining granules called? - correct answers ✔✔Metachromatic
Which of the following organisms are non-motile? - correct answers ✔✔Shigella and Klebsiella
In the bacterial growth cycle, growth ceases because nutrients are exhausted or toxic metabolic
products have accumulated in which phase? - correct answers ✔✔Stationary phase
Which of the following genera of bacteria form spores? - correct answers ✔✔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 answers ✔✔Anaerobes
What is the temperature at which bacteria grow best known as? - correct answers ✔✔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 answers ✔✔Alpha-prime
hemolysis
What is the most effective method of sterilization? - correct answers ✔✔Autoclaving
Which of the following is used for quality control for the dry heat oven? - correct answers
✔✔Bacillus subtilis
Media that cannot be heated can be sterilized by what alternate method? - correct answers
✔✔Filtration
Which one of the following disinfectants is the most effective germicide against bacteria, spores,
tubercle bacilli, fungi, and viruses? - correct answers ✔✔Chlorine
What is a term that describes a process or treatment that renders a medical device, instrument,
or environmental surface safe to handle? - correct answers ✔✔Decontamination
What color do gram-positive bacteria stain? - correct answers ✔✔Purple
Acid-fast bacteria appear what color microscopically? - correct answers ✔✔Red
Acid-fast organisms in tissue are best stained by which of the following methods? - correct
answers ✔✔Kinyoun
Which of the following should be used to remove antimicrobials before culturing? - correct
answers ✔✔Antimicrobial removal device
, Which statement concerning sodium polyanethol sulfonate (SPS) is NOT true? - correct answers
✔✔Activates some antimicrobials
What are some functions of sodium polyanethol sulfonate (SPS)? - correct answers ✔✔Prevents
blood from clotting, prevents phagocytosis, and neutralizes the bactericidal effect of human
serum.
What is the most abundant normal flora in throat cultures? - correct answers ✔✔Alpha-
hemolytic streptococci
Why is it recommended to stab the blood agar plate when setting up throat cultures? - correct
answers ✔✔Some streptococci may not produce beta hemolysis under aerobic conditions.
What is the most common pathogen is throat cultures? - correct answers ✔✔Streptococcus
pyogenes
Nasopharangeal swabs are recommended for the detection of which carriers? - correct answers
✔✔H. influenzae, N. meningitidis, and B. pertussis
Why is a first morning urine specimen preferred for urine cultures? - correct answers
✔✔Specimen is more concentrated.
What indicates vaginal or urethral contamination of urine? - correct answers ✔✔Greater than
10 squamous epithelial cells per hpf.
How are smears of cerebrospinal fluid prepared? - correct answers ✔✔Centrifuged CSF
sediment
Smears of CSF are usually stained with which stain? - correct answers ✔✔Gram stain
100% Correct Answers
What term describes the morphology of organisms that vary in shape and size? - correct
answers ✔✔Pleomorphic
Capsules are the basis of which test? - correct answers ✔✔Serotyping
A mucoid colony on blood agar medium indicates that which of the following characteristics
may be present? - correct answers ✔✔Organism has a capsule.
What are dark staining granules called? - correct answers ✔✔Metachromatic
Which of the following organisms are non-motile? - correct answers ✔✔Shigella and Klebsiella
In the bacterial growth cycle, growth ceases because nutrients are exhausted or toxic metabolic
products have accumulated in which phase? - correct answers ✔✔Stationary phase
Which of the following genera of bacteria form spores? - correct answers ✔✔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 answers ✔✔Anaerobes
What is the temperature at which bacteria grow best known as? - correct answers ✔✔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 answers ✔✔Alpha-prime
hemolysis
What is the most effective method of sterilization? - correct answers ✔✔Autoclaving
Which of the following is used for quality control for the dry heat oven? - correct answers
✔✔Bacillus subtilis
Media that cannot be heated can be sterilized by what alternate method? - correct answers
✔✔Filtration
Which one of the following disinfectants is the most effective germicide against bacteria, spores,
tubercle bacilli, fungi, and viruses? - correct answers ✔✔Chlorine
What is a term that describes a process or treatment that renders a medical device, instrument,
or environmental surface safe to handle? - correct answers ✔✔Decontamination
What color do gram-positive bacteria stain? - correct answers ✔✔Purple
Acid-fast bacteria appear what color microscopically? - correct answers ✔✔Red
Acid-fast organisms in tissue are best stained by which of the following methods? - correct
answers ✔✔Kinyoun
Which of the following should be used to remove antimicrobials before culturing? - correct
answers ✔✔Antimicrobial removal device
, Which statement concerning sodium polyanethol sulfonate (SPS) is NOT true? - correct answers
✔✔Activates some antimicrobials
What are some functions of sodium polyanethol sulfonate (SPS)? - correct answers ✔✔Prevents
blood from clotting, prevents phagocytosis, and neutralizes the bactericidal effect of human
serum.
What is the most abundant normal flora in throat cultures? - correct answers ✔✔Alpha-
hemolytic streptococci
Why is it recommended to stab the blood agar plate when setting up throat cultures? - correct
answers ✔✔Some streptococci may not produce beta hemolysis under aerobic conditions.
What is the most common pathogen is throat cultures? - correct answers ✔✔Streptococcus
pyogenes
Nasopharangeal swabs are recommended for the detection of which carriers? - correct answers
✔✔H. influenzae, N. meningitidis, and B. pertussis
Why is a first morning urine specimen preferred for urine cultures? - correct answers
✔✔Specimen is more concentrated.
What indicates vaginal or urethral contamination of urine? - correct answers ✔✔Greater than
10 squamous epithelial cells per hpf.
How are smears of cerebrospinal fluid prepared? - correct answers ✔✔Centrifuged CSF
sediment
Smears of CSF are usually stained with which stain? - correct answers ✔✔Gram stain
