GPC Exam questions with complete
solutions rated A+
catalase - correct answer ✔✔ An enzyme produced in all cells to decompose hydrogen
peroxide, a by-product of cell respiration
-picking up organism with an iron loop
-pseudo catalase - correct answer ✔✔ 2 causes for false positive catalase test
oxygen released from hydrogen peroxide - correct answer ✔✔ what causes bubbles with
catalase test
-micrococcus
-staphylococcus - correct answer ✔✔ organisms that are catalase positive
bacteriostatic - correct answer ✔✔ Antibiotic that inhibits further bacterial growth
Bacteriocidal - correct answer ✔✔ Antibiotic that kills bacteria
-bacitracin and furazolidone - correct answer ✔✔ antibiotics that differ micrococcus from Coag
negative staphylococcus
resistant to furazolidione
sensitive to bacitracin - correct answer ✔✔ S/R with micrococcus to bacitracin and furazolidone
-sensitive to furazolidione
,-resistant to bacitracin - correct answer ✔✔ S/R with coat negative stamp to bacitracin and
furazolidone
Modified oxidase test - correct answer ✔✔ tests for C-type cytochromes in gram-positive
organisms grown under certain conditions
dark blue - correct answer ✔✔ positive Modified oxidase test color
micrococcus - correct answer ✔✔ Organism positive for modified oxidase
staph and strep - correct answer ✔✔ organisms negative for modified oxidase test
Lysostaphin - correct answer ✔✔ Mixture of enzymes that lyse cell walls of Staph
coagulase - correct answer ✔✔ Enzyme an organism possesses that has the ability to clot
plasma
clumping - correct answer ✔✔ The slide coagulase test detects what
clots - correct answer ✔✔ The tube coagulase test detects what?
bound coagulase - correct answer ✔✔ The slide test measures bound or free coagulase
free coagulase - correct answer ✔✔ The tube method measures bound or free coagulase
S.aurues - correct answer ✔✔ The coagulase test is mainly to detect what organism?
, DNase - correct answer ✔✔ enzyme that breaks down DNA
S. epidermis negative (purple color) - correct answer ✔✔ Trehalose mannitol broth is used to ID
what org
S. saphrophyticus - correct answer ✔✔ Organism that is resistant to novobiocin
Pyrrolindonyl arylamidase (PYR) - correct answer ✔✔ Test that detects the enzyme L-
pyrrolidonyl arylamidase
pink - correct answer ✔✔ What color is a positive PYR test
-Group A strep
-enterococcus - correct answer ✔✔ What organisms are PYR positive
Gr. D strep - correct answer ✔✔ What organism is PYR negative
Ornithine decarboxylase - correct answer ✔✔ Enzyme that catalyzes the decarboxylation of
ornithine to make patricine
S. lungdunensis - correct answer ✔✔ What organism is ornithine positive
purple - correct answer ✔✔ color of positive ornithine test
pink - correct answer ✔✔ positive urease color
-S. epi
solutions rated A+
catalase - correct answer ✔✔ An enzyme produced in all cells to decompose hydrogen
peroxide, a by-product of cell respiration
-picking up organism with an iron loop
-pseudo catalase - correct answer ✔✔ 2 causes for false positive catalase test
oxygen released from hydrogen peroxide - correct answer ✔✔ what causes bubbles with
catalase test
-micrococcus
-staphylococcus - correct answer ✔✔ organisms that are catalase positive
bacteriostatic - correct answer ✔✔ Antibiotic that inhibits further bacterial growth
Bacteriocidal - correct answer ✔✔ Antibiotic that kills bacteria
-bacitracin and furazolidone - correct answer ✔✔ antibiotics that differ micrococcus from Coag
negative staphylococcus
resistant to furazolidione
sensitive to bacitracin - correct answer ✔✔ S/R with micrococcus to bacitracin and furazolidone
-sensitive to furazolidione
,-resistant to bacitracin - correct answer ✔✔ S/R with coat negative stamp to bacitracin and
furazolidone
Modified oxidase test - correct answer ✔✔ tests for C-type cytochromes in gram-positive
organisms grown under certain conditions
dark blue - correct answer ✔✔ positive Modified oxidase test color
micrococcus - correct answer ✔✔ Organism positive for modified oxidase
staph and strep - correct answer ✔✔ organisms negative for modified oxidase test
Lysostaphin - correct answer ✔✔ Mixture of enzymes that lyse cell walls of Staph
coagulase - correct answer ✔✔ Enzyme an organism possesses that has the ability to clot
plasma
clumping - correct answer ✔✔ The slide coagulase test detects what
clots - correct answer ✔✔ The tube coagulase test detects what?
bound coagulase - correct answer ✔✔ The slide test measures bound or free coagulase
free coagulase - correct answer ✔✔ The tube method measures bound or free coagulase
S.aurues - correct answer ✔✔ The coagulase test is mainly to detect what organism?
, DNase - correct answer ✔✔ enzyme that breaks down DNA
S. epidermis negative (purple color) - correct answer ✔✔ Trehalose mannitol broth is used to ID
what org
S. saphrophyticus - correct answer ✔✔ Organism that is resistant to novobiocin
Pyrrolindonyl arylamidase (PYR) - correct answer ✔✔ Test that detects the enzyme L-
pyrrolidonyl arylamidase
pink - correct answer ✔✔ What color is a positive PYR test
-Group A strep
-enterococcus - correct answer ✔✔ What organisms are PYR positive
Gr. D strep - correct answer ✔✔ What organism is PYR negative
Ornithine decarboxylase - correct answer ✔✔ Enzyme that catalyzes the decarboxylation of
ornithine to make patricine
S. lungdunensis - correct answer ✔✔ What organism is ornithine positive
purple - correct answer ✔✔ color of positive ornithine test
pink - correct answer ✔✔ positive urease color
-S. epi
