Drugs used to treat AIDS and herpes virus infections are synthetic versions of compounds found in ____
a. sea anemones
b. sponges
c. roundworms
d. cnidarians
e. planaria
ANSWER: b
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Which one of the following is a primary component of both living organisms and the Earth's crust?
A. silicon B. hydrogen C. oxygen D. carbon E. nitrogen
Why would a person who has their tonsils removed be more susceptible to certain types of infections of the throat and respiratory tract?
A. Tonsils produce high levels of lactoferrin, a strong natural antibacterial compound. B. Tonsils produce large amounts of interferons, natural antiviral compounds. C. Tonsils are secondary lymphoid organs-they help to provide a constant response to the microbes in the oral cavity, helping to keep them in check and preventing them from spreading to other areas. D. Tonsils are the location where T cells develop and mature. Without them, a person won't have T cells, and will be more likely to suffer from infections that would normally be eliminated by such cells.
The study of the observable is
a. science. b. optics. c. hypothesis. d. critical thinking. e. visualization.
If you looked at unknown cells under a microscope, what could lead you to correctly conclude that they are prokaryotic cells?
A) They appear to have a cell wall. B) They lack a nucleus. C) They are oblong in shape. D) They form a colony.