If a person is treated with a single anti-HIV drug, they often end up with a resistant strain. How does this occur?
a. The drugs weaken the immune system, making a patient more susceptible to infection with resistant strains of HIV
b. The drug causes mutations in the HIV, making them resistant to the drug
c. The drugs kill all sensitive viruses, leaving only the pre-existing resistant viruses
d. The HIV wants to avoid the drug, so it becomes resistant
c. The drugs kill all sensitive viruses, leaving only the pre-existing resistant viruses
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The Ames test is useful as a rapid screening test to identify those compounds that
A. will respond to chemical agents. B. are mutagens. C. respond to the deletion of DNases. D. will protect an organism from cancer. E. will respond to chemical agents AND will protect an organism from cancer.
The scientist who made variolation safer and more effective was
A. Pasteur. B. Jenner. C. Metchnikoff. D. Fleming.
The solar system is about how many years old?
a. about 12 billion b. about 4.6 billion c. 750 million d. 400 million e. 200 million
Anti-virals for the influenza virus administered within the first 24-48 hours of the onset of illness can decrease the duration of the flu by at least 3 days. ?
Indicate whether the statement is true or false