Depolarization of the neuron plasma membrane occurs due to
a. the diffusion of K+ into the cell.
b. the diffusion of K+ out of the cell.
c. the diffusion of Na+ into the cell.
d. the diffusion of Na+ out of the cell.
e. closed gated channels.
C
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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 region(s) where hormonal adjustment to
solute and volume levels occur(s) is(are) indicated by a. A. b. B. c. C. d. D. e. C and D.
Blood flows from the right ventricle to the ________.
Fill in the blank(s) with the appropriate word(s).
What does fossil evidence show to differentiate Homo erectus from Homo habilis?
a. H. erectus did not use tools. b. H. erectus was shorter than H. habilis. c. H. erectus had a larger brain than H. habilis. d. H. erectus had more pronounced sexual dimorphism than H. habilis. e. H. erectus was the first member of the genus Homo without pronounced supraorbital ridges.