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Example Questions
Example Question #11 : Identifying Bacteria
Proteus mirabilis is classified as which of the following?
Gram-negative, anaerobic, coccus
Gram-negative, anaerobic, rod-shaped
Gram-positive, anaerobic, rod-shaped
Gram-positive, aerobic, coccus
Gram-negative, anaerobic, rod-shaped
Proteus mirabilis is a Gram-negative, facultatively anaerobic, rod-shaped (bacillus) bacteria. It produces large amounts of the enzyme urease, which is able to hydrolyze urea to ammonia, causing the distinctively high pH seen in the urine of individuals with a P. mirabilis infection.
Example Question #12 : Identifying Bacteria
Which of the following bacteria is Gram positive cocci that is found in clusters?
E. Coli
Staphlococcyous aureus
Pseudomonas
Streptococcyous pyogenes
Staphlococcyous aureus
Bacteria are classified as either Gram positive or Gram negative. Gram positive bacteria stain purple because of their thick peptidoglycan cell wall. Staph and Strep groups are both Gram positive. Bacteria can then be organized based on their shape. Cocci are circular while bacilli are rectangular in shape. Staph grows in clusters.
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