The geographical distribution of organisms makes sense only in the context of:
a. natural selection.
b. plate tectonics.
c. continental drift.
d. evolution.
e. ecology.
D
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Most of the significant changes in activities and functions that accompany passage through a cell cycle checkpoint are regulated by the:
A. activation of microtubules. B. changes in membrane polarization. C. activation of kinase enzymes. D. activation of DNA polymerase. E. inhibition of cyclin proteins.
The compression of a large amount of wave energy into a suddenly smaller volume of water causes: a. a shallow-water wave
b. a seismic sea wave. c. a deep-water wave. d. breakers.
Which of the following occurs in prophase?
a. sister chromatid attachment b. the replication of DNA c. chromosomes aligned in the middle of the cell d. breakdown of the nuclear envelope e. separation of sister chromatids
Which one of the following tissues can respond to the environment by generating electrical signals?
A) dermis B) nervous C) muscle D) epithelial E) connective