MCB 2289micro module 7 quiz

 Question 1 Which test utilizes hydrogen peroxide and the observation of gas bubble formation when attempting to identify an unknown bacterium? Selected Answer: Catalase test Answers: Bile esculin hydrolysis Coagulase test Oxidase test Catalase test  Question 2 Which of the following is a characteristic of members of the resident microbiota? Selected Answer: Resident microbiota can compete with and limit growth of harmful bacteria. Answers: Resident microbiota can compete with and limit growth of harmful bacteria. Resident microbiota are a major source of nutrients for our body. Resident microbiota typically cause serious infections. Resident microbiota often initiate allergic reactions.  Question 3 Which test uses a medium that is both selective and differential for members of the genus Staphylococcus? Selected Answer: Mannitol Salt agar Answers: MacConkey agar Mannitol Salt agar Coagulase test Bile esculin hydrolysis  Question 4 This study source was downloaded by from CourseH on :20:12 GMT -05:00 This study resource was shared via CourseHHow do you determine the species of an unknown bacterium? Selected Answer: You need to quantify the number of bacteria in the same to determine the species. Answers: You should make a careful investigation of the morphology of the bacterial cells using a microscope to make a firm identification. You need to quantify the number of bacteria in the same to determine the species. Identification can only be made based on the patient's signs and symptoms. You use standard tests and pre-existing knowledge to classify the bacterium.  Question 5 The _________ test involves using rabbit plasma as a reagent and its results are determined by observation of thickening of the medium. Selected Answer: Coagulase Answers: Catalase Oxidase Coagulase Peroxidase  Question 6 Impetigo, a type of inflammatory skin infection, is caused by__________ Selected Answer: Staphylococcus aureus Answers: Enterococcus faecalis Streptococcus pneumoniae Staphylococcus aureus E. coli This study source was downloaded by from CourseH on :20:12 GMT -05:00 This study resource was shared via CourseH Question 7 Identification of a bacterial species cannot be made on microscopic morphology alone because __________. Selected Answer: Many organisms have a similar microscopic morphology Answers: Bacterial shapes are usually variable and are not a reliable characteristic for identification Many organisms have a similar microscopic morphology Staining reactions are variable and not a reliable characteristic Staining and microscopic observation is too time-consuming for routine use  Question 8 A bacterial isolate grown on a mannitol salt agar plate changes the pink agar to yellow and produces bright yellow colonies. This indicates that the isolate is _______ for mannitol fermentation. Selected Answer: Positive Answers: Negative Positive  Question 9 Before attempting to identify an unknown bacterial species, the organism must be isolated in a pure culture. Selected Answer: Tru e Answers: Tru e False  Question 10 A microorganisms that is most often harmless but may occasionally cause infection and disease if defenses are compromised is referred to as an opportunistic pathogen. Selected Answer: Tru e This study source was downloaded by from CourseH on :20:12 GMT -05:00 This study resource was shared via CourseHAnswers: Tru e False  Question 11 The field of study in which medicine and microbiology intersect is known as medical microbiology Selected Answer: Tru e Answers: Tru e False  Question 12 All of the following are methods that can be used to isolate bacteria from a mixed culture EXCEPT? Selected Answer: Gram staining Answers: Streak plating Loop dilution pour plating Gram staining Serial dilution followed by spread plating  Question 13 The Gram stain is an example of a test that can be used to determine the ______ characteristics of a bacterium? Selected Answer: Morphological Answers: Physiological Genetic Morphological Culturing  Question 14 The absence of hemolysis on a blood agar plate is referred to as _______ hemolysis This study source was downloaded by from CourseH on :20:12 GMT -05:00 This study resource was shared via CourseHSelected Answer: Gamma Answers: Alpha Beta Gamma Delta  Question 15 All of the following body sites normally have large numbers of resident microbiota EXCEPT? Selected Answer: Blood Answers: Nose Large intestine Skin Blood  Question 16 Which of the following bacterial species would be most likely to grow in bile esculin medium and hydrolyze the esculin? Selected Answer: Enterococcus faecalis Answers: Enterococcus faecalis Streptococcus pneumoniae Staphylococcus aureus Staphylococcus epidermidis  Question 17 All of the following infections are frequently cause by Staphylococcus and Streptococcus species EXCEPT? This study source was downloaded by from CourseH on :20:12 GMT -05:00 This study resource was shared via CourseHSelected Answer: Diarrhea Answers: Endocarditis Abscess Diarrhea Pneumonia  Question 18 The complete clearing or hemolysis that a bacterial isolate may produce on blood agar is called alpha hemolysis Selected Answer: Fals e Answers: True Fals e  Question 19 Gram-positive cocci in chains would be called staphylococci. Selected Answer: Fals e Answers: True Fals e  Question 20 When a large zone of no growth is found around an antibiotic disc being used for identification purposed, this generally means that the microbe is ______ to the antibiotic Selected Answer: Resistant Answers: Resistant Pathogenic Sensitive Neutral Wednesday, May 15, 2019 4:09:37 PM CDT This study source was downloaded by from CourseH on :20:12 GMT -05:00 This study resource was shared via CourseH Powered by TCPDF ()