Micro Chapters 19 & 4

Study quizzes for final
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Terms in this set (...)

2 environmental reservoirs for pathogens.
1. Water
2. Soil
Epidemiologists investigate disease outbreak to determine.....
1. Causative agent
2. Reservoir
3. Rout of transmission
People who have asymptomatic infections or are colonized with a pathogen are __________ of the infectious agent (i.e. Typhoid Mary).
Carriers
Pathogens may be shed in.....
1. Feces
2. Respiratory droplets
3. Urine
Indirect contact transmission involves transfer of pathogens via ________.
Fomites
Droplet transmission of respiratory pathogens is considered _______ because of the close proximity involved.
Contact
The MMWR, put out by the CDC stands for......
Morbidity and Mortality Weekly Report
This type of study is generally used to evaluate the effectiveness of treatment or intervention in preventing disease.
Experimental
Most prokaryotes multiply by....
Binary fission
The time required for a prokaryotic population to double in number is called
Growth factor time
Prokaryotes often live in a polysaccharide-encased community known as a _______.
Biofilm
Which method is used to isolate bacteria in order to obtain a pure culture?
Streak plate method
When grown in a closed system, a population of bacterial cells goes through the following 5 phases: lag, _______, stationary, death, and prolonged decline.
Log
What instrument is used to measure the turbidity of a culture?
Spectrophotometer
This type of medium inhibits organisms other than the one being sought.
Selective
This type of medium contains a substance that certain bacteria change in a recognizable way.
Differential
This type of medium provides conditions in a broth that enhance the growth of one particular organism in a mixed population.
Enrichment
Prokaryotes often grown in close associations containing multiple different _________
Species
Organisms can be grouped as neutrophils, acidophiles, or alkalophiles, based on their optimum ___.
pH
Bacteria that cannot synthesis cell constituents such as amino acids and vitamins require these as.....
Growth factors