A serum sample from a patient is examined on an electron microscope, and observed to contain Dane particles, filamentous, and spherical virion particles in abundance. This observation indicates infection with
A) human herpesvirus 1.
B) EBV.
C) hepatitis B.
D) hepatitis D.
E) VZV.
C
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Gregor Mendel was a completely self-trained scientist and never attended university
a. True b. False Indicate whether the statement is true or false
Many instances involving genetically modified organisms, especially food crops, will be entering the human food chain in the years to come. On what basis are genetically modified foods considered safe to eat?
A) Because of the possible economic impact of rigorous testing, such food products are minimally tested in sheep and cattle. B) All products to be cleared for human consumption have been personally tested by all members of the regulatory agency. C) They are only slightly toxic. D) Genetically modified food products are considered safe if they are found to be not toxic or allergenic or have other negative physiological effects. E) Each genetically modified food product is screened for its resistance to antibiotics.
Passive immunity differs from active immunity in that passive immunity
A) causes long-term immunity. B) involves the administration of preformed antibodies. C) results in the production of antibodies. D) is not effective against a preexisting condition. E) results in the production of memory cells.
While standard two-component regulatory systems typically act to control gene transcription, phosphorelay systems can act either to control gene transcription or to control .
A. DNA replication B. translation C. protein activity D. All of the choices are correct.