Microscopic Study of the Contact Lens Fluid of a Person

question 216

Multiple Choice

Microscopic study of the contact lens fluid of a person with an eye infection revealed a series of four nested parasites: an amoeba, which contained a giant virus, which contained a smaller virus, which contained chunks of parasitic DNA.How could these four parasites best be characterized?

• A) All are symbiotic microparasites, but only the amoeba is known to be pathogenic.
• B) All are symbiotic microparasites that are also pathogens.
• C) All are microparasites that are symbiotic but not pathogenic.
• D) All are symbiotic microparasites, but only viruses, not amoebae, are pathogenic.
• E) The amoeba is a macroparasite, the others are microparasites, and none are pathogenic.

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