MLT 207 Exam 3

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MLT 207 Exam 3


Froggy Jumps MLT 207 Exam 3Versión en línea for MLT 207 exam 3 as a study guide por MLT Program - MCTC 1 Proteus species have a unique odor that is a putrid b musty c fruity 2 The colony elevation for Streptococcus pneumoniae can be described as umbilicate due to autolysis. a true b false c 3 Colonies of Streptococcus pyogenes can be described as being translucent, while most other gram-positive and gram-negative organisms are opaque. a true b false c 4 A green coloration on a blood agar plate around and below colonies due to partial lysis of the red blood cells is referred to as __________ hemolysis. a gamma b beta c alpha 5 Which of the following organisms produces a “Medusa head” colony appearance? a Proteus mirabilis b Bacillus anthracis c Staphylococcus epidermidis 6 TSI agar is most useful in identifying which of the following? a gram negative bacilli b gram negative cocci c gram positive cocci 7 H2S production can be observed in all of the following media, EXCEPT a TSI b XLD c MacConkey 8 In the TSI slant, no fermentation is indicated by a red slant/ red butt (K/K) b red slant/ yellow butt (K/A) c yellow slant/ yellow butt (A/A) 9 Serratia marcescens produces a pigment that is what color? a green b red c yellow 10 An alpha hemolytic, gram positive organism was catalase negative and susceptible to the optochin disk. This would be presumptive identification for a S. pneumoniae b Group A Streptococcus (S. pyogenes) c Group B Streptococcus (S. agalactiae) 11 If the bacitracin disk shows susceptibility on a gram positive, beta hemolytic, catalase negative organism, the presumptive identification is a S. pneumoniae b Group A Streptococcus (S. pyogenes) c Group B Streptococcus (S. agalactiae) 12 This reaction determines the presence of delayed or slow lactose-fermenting strains? a Indole b Oxidase c ONPG 13 A positive bile esculin result would be demonstrated when the media turns a black b red c yellow 14 All of the following would have a positive H2S, EXCEPT a Salmonella b Proteus c E. coli 15 Explain how you could tell that an organism is a gas producer using the TSI slant. a Media lifts from the bottom of the tube b Media turns black c Media turns yellow 16 Which of the following test demonstrates the ability of an organism to utilize a single substrate as its sole carbon source? a Indole b Citrate c Hippurate 17 Which species of microorganism exhibits a swarming growth pattern? a Proteus b Escherichia c Staphylococcus 18 Motility agar showing the “umbrella” pattern after the organism was incubated at room temperature is indicative of a Listeria monocytogenes b Shigella flexneri c Salmonella enteritidis 19 Indole production is detected by the addition of what reagent a zinc b Kovac's/Ehrlich's c Ferrous Sulfate 20 Under the influence of a bile salt (sodium deoxycholate) some organisms rapidly autolyse. This is the principle for which of the following tests? a Bile solubility b Catalase c Hippurate 21 This test checks for the enzyme that converts soluble fibrinogen into soluble fibrin. It is called a Catalase b Coagulase c PYR 22 In the absence of oxygen, an organic substrate serves as the terminal electron acceptor in which of the following? a hydrolysis b oxidation c fermentation 23 Appearance of an intense green color indicates a positive deamination for phenylalanine after the addition of which of the following reagents? a ferric chloride b zinc c bromocresol green 24 PAD test is positive for all of the following organisms, EXCEPT a Morganella b Providencia c Klebsiella 25 In this test procedure certain bacteria produce an enzyme which hydrolyzes urea into ammonia, water and carbon dioxide producing an alkaline end product that causes the indicator to change from yellow to pink. This test is called a Urease b Amylase c Citrate 26 The test that differentiates Proteus & Klebsiella sp. from one another and presumptively identifies E. Coli is a Indole b Bile solubility c Hippurate 27 In this test procedure the organism is inoculated into a nutrient broth containing a nitrogen source and incubated with N,Ndimethyl-a-naphthylamine and sulfanilic acid. Zinc is added to confirm negative reactions. This test is called a Nitrite Reduction b Oxidase c ONPG 28 In this test procedure organisms that produce cytochrome oxidase will oxidize the substrate tetramethyl-pphenylenediamine-dihydrochloride to form indophenols. This test is called a Hippurate b Oxidase c Nitrate 29 A complete zone of clearing in a blood agar plate around or under colonies due to complete lysis of the red blood cells is __________ hemolysis. a beta b gamma c delta 30 The test that utilizes hydrogen peroxide as its substrate is the test. a catalase b PYR c coagulase 31 The test performed to see if certain gram-negative bacilli have the ability to liberate sulfur is a H2S production b Coagulase test c Novobiocin 32 The test based on the ability of a gram negative organism to oxidize tryptophan to pyruvic acid, indole and ammonia with a color change is a indole b bacatracin c oxidase 33 Most blood culture analyzers detect bacterial growth using the principle of a CO2 gas levels/ pH change b Radioactivity c Turbidity 34 Bile esculin is positive in the presumptive identification of a Group D Strep b Group A Strep c Strep. pneumoniae 35 Which of the following is NOT a way in which amino acids can be degraded by organisms? a protein synthesis b deamination c decarboxylation 36 If an organism is Voges-Proskauer positive, which pathway does it take? a acetyl methyl carbinol b oxidative c mixed acid fermentation 37 If an organism is methyl red positive, which pathway does it take? a mixed acid fermentation b fermentation c acetyl methyl carbinol 38 Which of the following can help differentiate Staphylococcus aureus from Staphylococcus epidermidis? a coagulase b catalase c urease 39 Which of the following tests is presumptive identification of Neisseria species? a oxidase b catalase c indole 40 Which of the following tests differentiates streptococcus from staphylococcus? a catalase b coagulase c urease

MLT 207 Exam 3

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MLT 207 Exam 3Versión en línea

por MLT Program - MCTC

Proteus species have a unique odor that is

The colony elevation for Streptococcus pneumoniae can be described as umbilicate due to autolysis.

Colonies of Streptococcus pyogenes can be described as being translucent, while most other gram-positive and gram-negative organisms are opaque.

A green coloration on a blood agar plate around and below colonies due to partial lysis of the red blood cells is referred to as __________ hemolysis.

Which of the following organisms produces a “Medusa head” colony appearance?

TSI agar is most useful in identifying which of the following?

H2S production can be observed in all of the following media, EXCEPT

In the TSI slant, no fermentation is indicated by

Serratia marcescens produces a pigment that is what color?

An alpha hemolytic, gram positive organism was catalase negative and susceptible to the optochin disk. This would be presumptive identification for

If the bacitracin disk shows susceptibility on a gram positive, beta hemolytic, catalase negative organism, the presumptive identification is

This reaction determines the presence of delayed or slow lactose-fermenting strains?

A positive bile esculin result would be demonstrated when the media turns

All of the following would have a positive H2S, EXCEPT

Explain how you could tell that an organism is a gas producer using the TSI slant.

Which of the following test demonstrates the ability of an organism to utilize a single substrate as its sole carbon source?

Which species of microorganism exhibits a swarming growth pattern?

Motility agar showing the “umbrella” pattern after the organism was incubated at room temperature is indicative of

Indole production is detected by the addition of what reagent

Under the influence of a bile salt (sodium deoxycholate) some organisms rapidly autolyse. This is the principle for which of the following tests?

This test checks for the enzyme that converts soluble fibrinogen into soluble fibrin. It is called

In the absence of oxygen, an organic substrate serves as the terminal electron acceptor in which of the following?

Appearance of an intense green color indicates a positive deamination for phenylalanine after the addition of which of the following reagents?

PAD test is positive for all of the following organisms, EXCEPT

In this test procedure certain bacteria produce an enzyme which hydrolyzes urea into ammonia, water and carbon dioxide producing an alkaline end product that causes the indicator to change from yellow to pink. This test is called

The test that differentiates Proteus & Klebsiella sp. from one another and presumptively identifies E. Coli is

In this test procedure the organism is inoculated into a nutrient broth containing a nitrogen source and incubated with N,Ndimethyl-a-naphthylamine and sulfanilic acid. Zinc is added to confirm negative reactions. This test is called

In this test procedure organisms that produce cytochrome oxidase will oxidize the substrate tetramethyl-pphenylenediamine-dihydrochloride to form indophenols. This test is called

A complete zone of clearing in a blood agar plate around or under colonies due to complete lysis of the red blood cells is __________ hemolysis.

The test that utilizes hydrogen peroxide as its substrate is the test.

The test performed to see if certain gram-negative bacilli have the ability to liberate sulfur is

The test based on the ability of a gram negative organism to oxidize tryptophan to pyruvic acid, indole and ammonia with a color change is

Most blood culture analyzers detect bacterial growth using the principle of

Bile esculin is positive in the presumptive identification of

Which of the following is NOT a way in which amino acids can be degraded by organisms?

If an organism is Voges-Proskauer positive, which pathway does it take?

If an organism is methyl red positive, which pathway does it take?

Which of the following can help differentiate Staphylococcus aureus from Staphylococcus epidermidis?

Which of the following tests is presumptive identification of Neisseria species?

Which of the following tests differentiates streptococcus from staphylococcus?