At autopsy, the most prominent findings were bronchopneumonia with focal organization and hemorrhage in the right lung. Stains of the lung tissue were negative by Gram, methenamine silver, and acid-fast methods, but Dieterle silver stains revealed short bacilli. Lung cultures yielded Gram-negative bacilli, which grew aerobically on buffered charcoal-yeast extract, but not on blood or chocolate agar. The organisms resembled Legionella, but failed to stain with immunofluorescence conjugates for Legionella pneumophila and multiple other species (L minded, L longbeachae, L gormanii, L dumoffi, L bozemanii). The organism was sent to the Centers for Disease Control and Prevention, where it was eventually identified as a new species of Legionella. What is the most probable source of this man's infection?Family member WaterFoodInsectBioterrorismDark-field microscopy may be used to diagnose spirochetes in which of the following scenarios?To detect spirochetes in the blood of a patient with a positive RPR result but no symptomsTo detect spirochetes in the cerebrospinal fluid in a patient with tertiary syphilisTo detect spirochetes in the urine of a patient with suspected leptospirosisTo detect spirochetes in a suspicious lesion in the oral cavity in a patient with secondary syphilisBacteria that are obligate intracellular pathogens of humans are considered to beAutotrophsHeterotrophsPhotosyntheticHyperthermophilesChemolithotrophsWhich of the following statements best describes the pathogenesis of Clostridium botulinum?It elaborates an exotoxin that is a lecithinase that causes tissue necrosis.It elaborates a toxin that suppresses the release of inhibitory neurotransmitters.It produces a polysaccharide capsule that inhibits phagocytosis and contributes to invasion of the central nervous system.It elaborates a toxin that inhibits the release of acetylcholine at cholinergic synapses.It produces a leukotoxin that leads to abscess formation.The form of genetic exchange in bacteria that is most susceptible to the activity of deoxyribonuclease during the process of DNA uptake isAll of the aboveTransformationTransfectionTransductionConjugation

A deoxyribonuclease is an enzyme that catalyzes the hydrolytic cleavage of phosphodiester linkages…

Answered: The form of genetic exchange in…

Basic Clinical Laboratory Techniques 6E

6th Edition

ISBN:9781133893943

Author:ESTRIDGE

Publisher:ESTRIDGE

Chapter7: Basic Clinical Microbiology

Section7.3: Culture Techniques For Bacteriology

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At autopsy, the most prominent findings were bronchopneumonia with focal organization and hemorrhage in the right lung. Stains of the lung tissue were negative by Gram, methenamine silver, and acid-fast methods, but Dieterle silver stains revealed short bacilli. Lung cultures yielded Gram-negative bacilli, which grew aerobically on buffered charcoal-yeast extract, but not on blood or chocolate agar. The organisms resembled Legionella, but failed to stain with immunofluorescence conjugates for Legionella pneumophila and multiple other species (L minded, L longbeachae, L gormanii, L dumoffi, L bozemanii). The organism was sent to the Centers for Disease Control and Prevention, where it was eventually identified as a new species of Legionella. What is the most probable source of this man's infection?
- Family member
- Water
- Food
- Insect
- Bioterrorism
Dark-field microscopy may be used to diagnose spirochetes in which of the following scenarios?
- To detect spirochetes in the blood of a patient with a positive RPR result but no symptoms
- To detect spirochetes in the cerebrospinal fluid in a patient with tertiary syphilis
- To detect spirochetes in the urine of a patient with suspected leptospirosis
- To detect spirochetes in a suspicious lesion in the oral cavity in a patient with secondary syphilis
Bacteria that are obligate intracellular pathogens of humans are considered to be
- Autotrophs
- Heterotrophs
- Photosynthetic
- Hyperthermophiles
- Chemolithotrophs
Which of the following statements best describes the pathogenesis of Clostridium botulinum?
- It elaborates an exotoxin that is a lecithinase that causes tissue necrosis.
- It elaborates a toxin that suppresses the release of inhibitory neurotransmitters.
- It produces a polysaccharide capsule that inhibits phagocytosis and contributes to invasion of the central nervous system.
- It elaborates a toxin that inhibits the release of acetylcholine at cholinergic synapses.
- It produces a leukotoxin that leads to abscess formation.
The form of genetic exchange in bacteria that is most susceptible to the activity of deoxyribonuclease during the process of DNA uptake is
- All of the above
- Transformation
- Transfection
- Transduction
- Conjugation

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The form of genetic exchange in bacteria that is most susceptible to the activity of deoxyribonuclease during the process of DNA uptake is All of the above Transformation Transfection Transduction Conjugation