In the wake of the Ebola outbreak in West Africa in 2014-2016, researchers observed infectious Ebola virus is present in the eyes and semen of infected individuals months after apparent recovery from the acute stage of the disease. Based on information in this chapter, propose an explanation for this observation.

What will be an ideal response?


The eyes and testes are "hidden" sites which T cells do not normally enter. Virus infections are most effectively cleared by cell-mediated responses. CTL against Ebola virus cannot enter these areas under normal circumstances to attack infected cells, so the virus is not cleared from these organs.

Biology & Microbiology

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The vertebrate lung first appeared in which

organism?

a. fishes b. amphibians c. reptiles d. birds e. mammals

Biology & Microbiology

Because of hemoglobin, blood is able to carry ____ times more oxygen than what can dissolve in the blood

a. 30 b. 40 c. 50 d. 60 e. 70

Biology & Microbiology

Which type of white blood cells produces defensive proteins called antibodies?

A) Phagocytic cells B) T cells C) Natural killer cells D) B cells

Biology & Microbiology

How could you determine if a plant is heterosporous?

A) Male and female reproductive structures are located on separate plants. B) It has vascular tissue. C) It has multiple sporangia. D) Its diploid sporophyte produces spores via meiosis.

Biology & Microbiology