BIOL 230 Lab Exam #4

A detailed illustration of Streptococcus and Staphylococcus bacteria under a microscope, set in a laboratory environment, with vibrant colors and a focus on microbiological techniques.

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

31 Questions8 MinutesCreated by TestingBacteria47

Fill the blanks: Streptococcus species are usually classified clinically based on their ___________ properties on blood agar and according to their ____________ groups.

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 _____________________.

Staphylococcus saprophyticus is the one of species that is resistant to Novobiocin.

True

False

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

The specific region of an antigen where an antibody binds is called an epitope.

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

The Clearview® Strep A Exact II Dipstick is a serological test for detecting Group A Strep. The test consists of a membrane strip pre-coated with a known antibody specific for Group A Streptococcus. Which of these is a positive strip?

The known antigen test for SLE (Systemic Lupus Erythematosus) is deoxyribonucleoprotein adsorbed to latex particles. It's significance is that when anitbodies bind to this antigen then the sample is positive for the condition of SLE.

True

False

BIOL 230 Lab Exam #4

Streptococcus and Staphylococcus Quiz

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