Lab questions and Weekly challenge questions

Question 1

What is the most virulent species of staphylococci?

Answer 1

Staphylococcus aureus

Question 2

Where can S. epidermis be found normally on the human body?

Answer 2

Skin, musous membranes

Question 3

How will S. aureus appear on sheep blood agar?

Answer 3

Med-large, smooth, slightly raised, tan-yellow colonies which are beta hemolytic

Question 4

Name 2 supportive and 2 selective media useful when cultivating Staphylococcus aureus.

Answer 4

Blood and Chocolate Agar

PEA and CNA

Question 5

Which staphylococcus is associated with UTI in young females?

Answer 5

Staphylococcus saprophyticus

Question 6

What is the reagent used to determine the prescence of catalase?

Answer 6

Hydrogen peroxide

Question 7

Microdase will differentiate between

Answer 7

Micrococcus and Staphylococcus

Question 8

Which enzyme is detected by the microdase reagent?

Answer 8

oxidase

Question 9

Which organism is lysed by optochin

Answer 9

Streptococcus pneumoniae

Question 10

Name a beta hemolytic streptococcus that is PYR positive

Answer 10

Streptococcus pyogenes