Nonpathogenic Vibrio cholerae can acquire the cholera toxin gene by
A) phagocytosis.
B) transduction.
C) conjugation.
D) transformation.
E) infecting a pathogenic Vibrio cholerae.
B
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According to research done by Baron and Prado, how do prions move within the CNS?
a. They use receptors on the surfaces of nerve cells. b. They use vesicles found inside the nerve cells. c. They use tunneling nanotubes. d. They pinch off the nerve cell membrane. e. They stick to the outer surfaces of nerve cells.
When might unrelated individuals engage in apparently altruistic acts?
A. If the altruism is likely to be reciprocated. B. Unrelated individuals never perform apparently altruistic acts. C. If they are unselfish individuals. D. If they are trying to mate with each other. E. If the act benefits their population.
The Y chromosome is in the
A. egg. B. egg or sperm. C. polar body. D. sperm.
Barr bodies are a diagnostic feature of X inactivation.
Answer the following statement true (T) or false (F)