A disaster such as a meltdown in a nuclear power plant requires close examination of potential impacts on organisms. Which of the following would be useful to biologists in such a situation?
A) Use a molecular clock to time the divergence of species in an area from those far away.
B) Measure continental drift to determine if the disaster had accelerated movement of continents.
C) Use radiometric dating to determine if new species are forming.
D) Examine the mutation rate of species in the area.
Answer: D
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The acid-fast stain
A. reflects differences in cytoplasmic membrane structure. B. is useful for distinguishing a small group of organisms, including Mycobacterium. C. uses crystal violet and safranin. D. uses carbolfuchsin and methylene blue. E. is useful for distinguishing a small group of organisms, including Mycobacterium AND uses carbolfuchsin and methylene blue.
Random dispersion of individuals in a
population occurs when habitat conditions are ____, resource availability is ____, and individuals or pairs of individuals ____ one another. a. random; scarce; either attract or avoid b. clumped; fairly steady; neither attract nor avoid c. nearly uniform; random; neither attract nor avoid d. nearly uniform; fairly steady; neither attract nor avoid e. clumped; scarce; either attract or avoid
In human and many other eukaryotic species' cells, the nuclear membrane has to disappear to permit _____
A) cytokinesis B) the attachment of microtubules to kinetochores C) the splitting of the centrosomes D) the disassembly of the nucleolus
Which term describes kinetoplastida?
a. prokaryotic b. photosynthetic c. parasitic d. ciliated