As with all human herpes virus infections, an important characteristic of HSV-2 infection is
A) complete immunity once the infection has been successfully eradicated by the body.
B) an ongoing a latent infection in peripheral nerves which can reactivate periodically.
C) progressively worsening outbreaks each time the virus comes out of latency.
D) resistance to all anti-viral medications.
E) that it is highly dangerous even to immune-competent adults.
Answer: B
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You and your biology lab class take a field trip to a marine aquarium. Your guide is a marine biologist who studies squids. She explains to your class how squids are able to blend into their environment. She points out that squids have pouches of pigments embedded in their epithelium. The pouches are called
A. trochophores. B. spermatophores. C. lophophores. D. chromatophores. E. phytophores.
The quaint northern resort town of Ejemplo Lago, known for its ice fishing and maple syrup production, has experienced an unusually hot summer, followed by a temperate fall. By December 1, the eponymous lake has still not frozen over; in fact, the temperature has not fallen below 4°C. Other than being forced to cancel the annual Fish and Flapjacks Charity Breakfast, what other effects can the residents of Ejemplo Lago expect?
a. a reduction in subsurface algal growth b. increase in spring lakeside plant growth c. an overall reduction in biodiversity d. a significant reduction of migratory birds
Consider the evolution of metabolic pathways. We believe that these pathways evolved from the
a. precursor to the end product, as enzymes became more efficient over time. b. precursor to the end product, as cells simplified the biochemistry of the external environment. c. end product to the precursor, as cells gradually evolved according to a predetermined plan. d. end product to the precursor, as intermediates in the pathway were depleted in the environment. e. end product to the precursor, as photosynthesis began to supply the energy to power the changes at each stage.
Peptic ulcers are caused by damage to the wall of the stomach by the acids that help digest food. This can be caused
by the failure of ____.
a. tight junctions b. adhering junctions c. gap junctions d. plasmodesmata e. adhering and gap junctions