A ____________ is a clear zone on a bacterial lawn where cells have been killed by the
activity of a bacteriophage.
colony
plaque
lawn
culture
The Correct Answer is C
A. activity of a bacteriophage: This describes the cause of the clear zone, since bacteriophages infect and lyse bacterial cells, but it is not the correct term used for the zone itself.
B. colony: A colony is a visible cluster of bacterial cells originating from a single progenitor cell, not a clear zone caused by viral lysis.
C. plaque: A plaque is the clear area formed on a bacterial lawn where bacteriophages have infected and destroyed bacterial cells. It represents viral activity and spread.
D. lawn: A lawn refers to the uniform layer of bacterial growth on the agar surface, which serves as the background where plaques can be observed.
E. culture: A culture is the overall growth of microorganisms in a medium, not the specific clear zone produced by bacteriophage activity.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Intermediate host: The intermediate host harbors the larval or asexual stage of a parasite but does not support adult development or mating of helminths.
B. Secondary host: This term is sometimes used interchangeably with intermediate host, meaning it also supports only immature stages of the parasite rather than adulthood and reproduction.
C. Definitive host: The definitive host is where helminths reach maturity and undergo sexual reproduction. Adulthood and mating occur here.
D. Transport host: A transport (paratenic) host temporarily harbors the parasite without further development, serving mainly to pass it to another host.
E. Mating takes place in all hosts: Only the definitive host provides the environment for sexual reproduction and full maturity of helminths.
Correct Answer is C
Explanation
A. Escherichia: This bacterial genus includes Escherichia coli, a common cause of urinary tract infections and gastrointestinal illness, but it does not cause pinworm disease.
B. Enterococcus: These bacteria are part of the normal gut flora and may cause opportunistic infections, but they are not responsible for pinworm infestation.
C. Enterobius: Enterobius vermicularis is the causative agent of pinworm infection, a helminthic disease spread via the fecal–oral route and characterized by perianal itching, especially at night.
D. Entamoeba: Entamoeba histolytica is a protozoan parasite that causes amoebiasis and dysentery, but it is unrelated to pinworm disease.
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