The filaments of the nuclear lamina are composed of a type of
a. microfilament.
b. microtubule.
c. intermediate filament.
d. thick filament.
Ans: c. intermediate filament.
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Members of the family Enterobacteriaceae
A. include E. coli, Enterobacter, Salmonella, and Shigella. B. include many medically relevant bacteria. C. primarily reside in the intestinal tract of humans and animals. D. are facultative anaerobes. E. All of the choices are correct.
If you sampled the genetic characteristics of a large
population and found that of the 50 loci analyzed there is very little, if any, variation, the most likely explanation is that a. a uniform environment selected for these alleles. b. there has been a lack of migration, and the genetic equilibrium stabilized the population. c. strong selection pressures eliminated alternative alleles. d. a bottleneck effect may have occurred in the past to reduce the variability in the population. e. a combination of low mutation rates and differential sexual selection produced these results.
Select the following statements that are related to mass extinctions.
A. The most severe mass extinction occurred at the end of the Cretaceous period. B. Periods of mass extinctions have occurred five times over the history of life on Earth. C. The current level of species diversity is so high it is highly unlikely that another mass extinction could occur. D. A mass extinction occurs when extinctions sharply outpace the formation of new species. E. During periods of mass extinction, dominant groups of organisms are protected and survive to repopulate.
Which of the following are antigen-presenting cells?
A. Macrophages B. B cells C. Cytotoxic T cells D. Macrophages and B cells E. Macrophages, B cells and cytotoxic T cells