All of the following are reasons why an HIV vaccine has not been developed EXCEPT
A) there is no known animal model of natural immunity for HIV infection.
B) use of a weakened virus would potentially transmit the infection.
C) small, inexpensive animals which could be used for HIV vaccine research are not available.
D) vaccines are not effective against viral infections.
E) HIV has a high mutation rate so one vaccination would not be effective to treat the world-wide pandemic.
D
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How would you characterize the amount of molecular traffic entering and leaving the nucleus?
a. There is a high amount of traffic entering and leaving the nucleus. b. There is a moderate amount of traffic entering and leaving the nucleus. c. There is a low amount of traffic entering and leaving the nucleus. d. Traffic is entering and leaving the nucleus exclusively at the time of cell division.
The root nodules on this soybean plant contain anaerobic bacteria that help the plant by:
1.absorbing water
2.fixing nitrogen
3.increasing root surface area
4.helping anchor the plant in the soil
Complement is a collection of
A) phagocytic cells that consume virus-infected body cells. B) antibodies. C) nonspecific antigens. D) blood proteins that assist antibodies. E) antibiotics.
A well-supported explanation for a particular scientific phenomenon
A) Ecosystem
B) Informed consent agreement
C) Epidemiologic studies
D) Critical thinking
E) Homeostasis
F) Metabolism
G) Placebo
H) Theory
I) Hypothesis
J) Adaptive trait