Microbiology Quiz

The normal flora of the large intestine consists mainly of

• Bacteria

• Fungi

• Protozoa

• Viruses

• No microbial agents

Thayer-Martin and Martin-Lewis media are used to isolate and identify

• E. coli

• Mycobacteria

• Neisseria

• Salmonella

• Shigella

Bacteria that synthesize organic compounds from inorganic compounds are

• Heterotrophs

• Obligate anaerobes

• Aerobes

• Facultative anaerobes

• Autotrophs

Bacteria capable of growth in a high salt concentration are best isolated in which of the following media?

• Basal media

• Complex growth media

• Differential growth media

• Selective growth media

The plasma membrane

• Contains matrix porins

• Includes endotoxin

• Contains glycocalyx

• Contains the enzymes involved in bacterial oxidative phosphorylation

A 21-year-old male college student who had complained of headache and feeling feverish the night before is brought this morning to the emergency department (ED) when his roommate was unable to rouse him. He had been well until yesterday. Vital signs include fever (39.8°C/103.1°F), tachycardia, and hypotension (BP 70/55). Remarkable on physical examination is petechial rash (purpuric in areas) and nuchal rigidity with positive Kernig and Brudzinski signs. CSF is cloudy with high protein and low glucose. Intracellular, red diplococci are seen on Gram stain. What is the most likely genus?

• Staphylococcus

• Streptococcus

• Mycobacteria

• Haemophilus

• Neisseria

There is an outbreak of gastrointestinal disease involving six children at a day care center. The children all have symptoms of fever, watery stool, and vomiting. Recent activities at the center involved playing with animals including kittens, turtles, birds, and hamsters. What types of bacteria are most likely to be observed in the stool?

• Gram-positive cocci

• Gram-negative cocci