The most precise method of obtaining estimates of the absolute ages of geological deposits is to
A. apply the principle of superposition (younger deposits above older deposits).
B. measure the ratios of various radioactive isotopes in the deposits.
C. measure rates of sedimentary rock formation.
D. make salinity measurements in ocean sediment deposits.
E. study the sequence of fossil types in the deposits.
Answer: B
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The cytomegalovirus (CMV) produces cytopathic effects (CPE) in diploid fibroblast cells in an average of 7 days. The results are available within 16 hours using which type of assay?
a. Conventional cell culture b. Shell vial c. Paired sera d. Western blot
Which of these is an incorrect comparison between flagella and cilia?
A. Flagella are longer structures than cilia. B. Flagella have essentially the same internal structure of cytoskeleton proteins as cilia. C. Flagella are used for propulsion, while cilia are used to attach cells to other cells or surfaces. D. Flagella and cilia are both used for types of cellular movement. E. Flagella are found in all three domains of organisms, while cilia are found only in Eukarya.
ATP
a. can be produced by photosynthesis. b. is produced in the degradation of organic compounds such as glucose. c. is generated in anaerobic respiration. d. is formed in aerobic respiration. e. does all of these.
Divergent evolution
A. is more common than convergent evolution. B. results in organisms that are less alike as time goes on. C. can be seen in a wide variety of habitats. D. All of these statements are true.