Why is it necessary to take special safety precautions when using radioactivity?
A. Radioactive substances decay.
B. Radioactive substances will perforate plasma membranes.
C. Radioactive substances will ionize cells.
D. Radioactive substances have the potential to cause damage to living cells.
Answer: D
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A substance that "teaches" the immune system to recognize a disease-causing agent without actually causing a disease is termed a(n)
A. antibiotic. B. sulfa drug. C. analgesic. D. vaccine. E. injection.
Which of the following is not predicted to occur due to increasing levels of atmospheric carbon?
1.Rises in ocean level 2.Ocean acidification 3.Disruption of regional patterns of rainfall and temperature 4.All of these are predicted results.
Before contact with Europeans, a tiny, isolated group of South Pacific islands had a population of about 50,000 people. Because of poor management of their own resources, the population fell to around 5000 by about the year 1750
When Europeans finally arrived, they brought smallpox, and after the ensuing epidemic, only about 800 islanders were left alive. The unusual genetic makeup of the native population is due to what phenomenon? A) genetic drift B) bottleneck effect C) gene flow D) speciation
According to the graph, during which season(s) of the year is the relationship between the sea slug and its dinoflagellates closest to being commensal?
A) winter B) spring C) summer D) spring and summer