30 Questions
What differentiates micrococci from staphylococci in terms of their appearance?
Micrococci appear in tetrads, while staphylococci appear in clusters.
Which of the following is a characteristic of streptococci?
Facultative anaerobes
What is the main product of glucose fermentation by homofermentative streptococci?
Lactic acid
Which streptococci are exceptions by being pigmented?
S. agalactiae
Where are viridans group streptococci typically located in the body?
Upper respiratory tract
Based on Bergey’s Classification, which group of streptococci fails to grow at 10°C but can be recovered at temperatures up to 45°C?
Viridans group
What type of test is used to identify Group B Streptococci?
CAMP Test
How is Group B Streptococci transmitted during birth?
Through the colonized birth canal
Which enzyme dissolves hyaluronic acid in the host's connective tissue?
Streptodornase
What is a characteristic of Group B Streptococci as mentioned in the text?
It may be encapsulated
What is the role of Streptokinase in the pathogen's activities?
Converts plasminogen into plasma
Which test is used for scarlet fever susceptibility?
Dick's Test
What is the typical appearance of metachromatic granules in the cytoplasm of the rod under a stained smear?
Beaded
Which of the following is NOT a characteristic of diphtheria caused by toxigenic strains of C.diphtheriae?
Incubation period of 7 days
In which anatomical sites is respiratory diphtheria most commonly found?
Pharynx and tonsils
What is the habitat of the bacteria that causes diphtheria?
Human nasopharynx
Which characteristic is NOT associated with the clinical manifestation of diphtheria?
Characterized by skin lesions
What gives the rod a 'Chinese letters' or 'palisades' appearance under microscopic observation?
Arrangement of cells at angles to one another
What is the most common E.rhusiopathiae infection in humans?
Erysipeloid
How do humans usually acquire E.rhusiopathiae infection?
Direct inoculation from animals or animal products
Which occupation group is at the greatest risk of E.rhusiopathiae infection?
Fishermen and fish handlers
What is the characteristic appearance of E.rhusiopathiae colonies in a gelatin stab culture?
"Molar tooth"
How can swine erysipelas be prevented?
Vaccinating pigs
What is the majority characteristic of Lactobacillus species related to antibiotic resistance?
Vancomycin resistant
What crystal formation is used to differentiate B. thuringiensis from B. cereus?
Cuboid or diamond-shaped crystals adjacent to the spore
Which characteristic helps distinguish Clostridium perfringens from other Clostridium species?
"Box Car appearance" of the colony
Which agar medium shows a double zone of hemolysis due to hemolysin and tetanolysin production?
Nutrient agar with MnSO4
Which of the following characteristics is NOT true for Bacillus cereus?
"Snow-shoe" shaped spores
What is a distinguishing characteristic of Bacillus subtilis?
"Barnyard odor" during culture incubation
Which of these organisms shows a reverse CAMP test (bowtie) result?
Clostridium perfringens
Test your knowledge on the characteristics of Micrococci and Streptococci, including their size, gram stain reactions, and arrangement. Learn about the differences between these two types of bacteria.
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