Which are the first to attack cancer cells and virus-infected cells?
A. cytotoxic T-cells
B. suppressor T-cells
C. delayed hypersensitivity T-cells
D. helper T-cells
E. natural killer (NK) cells
Answer: E
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Which of the following does not change the amount of genetic material on a chromosome?
A: A deletion B: An inversion C: A duplication D: A translocation E: All of the above change the amount of genetic material on a chromosome.
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Answer the following statement true (T) or false (F)
How does the K–T mass extinction impact our perception of gradualism, the predominant view of geological change since the days of Charles Lyell?
a. It disproves that Earth changes only gradually. b. Geological changes always happen rapidly. c. Long periods of gradual change can be disrupted by catastrophes. d. The speed of geological change cannot be quantified. e. A and C.