BIOL 230 Lab Exam #4
Streptococcus and Staphylococcus Quiz
Test your knowledge on Streptococcus and Staphylococcus species with this comprehensive quiz! Dive into various aspects of microbiology, from classification to characteristics.
- 31 questions covering key concepts
- Multiple-choice format for easy answering
- Learn and reinforce your understanding of gram-positive cocci
Fill the blanks: Streptococcus species are usually classified clinically based on their ___________ properties on blood agar and according to their ____________ groups.
Hemostatic
Serologic
Plasma
Hematocrit
Hemolytic
Streptococcus and Enterococcus occur in pairs or chains of varying lengths when grown in liquid medium, are gram-positive cocci and are catalase-negative.
True
False
Select the correct association(s).
Beta Hemolysis; no hemolysis or discoloration of the agar
Gamma Hemolysis; clear, red-blood-cell-free zone
Alpha Hemolysis; greenish discoloration of the agar
Beta Hemolysis; Hemolysin
Many streptococci can also be classified through the Lancefield system. Serologic groups on the basis of carbohydrate _________ in their cell wall
Agglutinogens
Agglutinins
Antibodiess
Antigens
Lancefield Classification of Streptococcus: Group A Streptococci (GAS)
Streptococcus agalactiae
Streptococcus anginosus
Streptococcus equi
Streptococcus pyogenes
Lancefield Classification of Streptococcus: Group B Streptococci (GBS)
Streptococcus agalactiae
Streptococcus equi
Streptococcus pyogenes
Streptococcus anginosus
Lancefield Classification of Streptococcus: Group C Streptococci
Streptococcus equisimilis
Streptococcus anginosus
Streptococcus pyogenes
Streptococcus agalactiae
Lancefield Classification of Streptococcus: Group F Streptococci
Streptococcus equisimilis
Streptococcus anginosus
Streptococcus agalactiae
Streptococcus pyogenes
Streptococcus pneumoniae is often referred to as _____________________________.
Pneumococci
Enterococcus
Streptococcus
Staphylococcus
Which organism is sensitive to Taxo A disc or bacitracin.
Streptococcus pyogenes
Streptococcus pneumoniae
Which organism is sensitive to Taxo P disc or optochin.
Streptococcus pyogenes
Streptococcus pneumoniae
Enterococcus
Lancefield group D streptococci are ____________________
Pneumococci
Streptococcus
Staphylococcus
Enterococcus
Enterococci are gram-positive streptococci that are normal flora of the __________________________.
Stomach
Nasopharynx
Laryngopharnx
Colon
SF broth contains sodium azide, which inhibits most bacteria other than enterococci. The medium also contains dextrose and a pH indicator (ferment the dextrose, turning the pH indicator from violet to a yellow-brown color).
True
False
Bile Esculin Agar contains bile salts, which prevents the growth of most bacteria and the medium also contains esculin. As the enterococci grow on the medium, they hydrolyze esculin into esculetin turning the color fromm ____________________________________________.
Red to Yellow
Yellow to Red
Purple to Yellow-Brown
Yellow-Brown to Black
Staphylococcus are __________________________ cocci and all are catalase_______________________. Staphylococcus species are often found in the ______________________. Staphylococcus species also have _____________________ to help _____________________.
Gram (-)
Gram (+)
Negative
Positive
Skin and Nasal Cavity
Larynx and Respiratory Airways
Capsules
Penetrate
Adhere
Staphylococcus aureus is always positive in Mannitol Salt agar and Staphylococcus saprophyticus is usually positive.
True
False
Staphylococcus aureus is the only one DNase-positive (cultures show a distinct clear zone around the streak where DNA in the agar was hydrolyzed by the bacterial DNase).
True
False
Antibodies (agglutinins) are protective proteins produced by the immune system (specifically plasma B cells) in response to the presence of an antigen.
True
False
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