During the _______ period, no additional action potentials can be created.
a. absolute refractory
b. conduction
c. integration
d. relative refractory
Answer: a. absolute refractory
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Much of the coast of the Indonesian island of Sumatra was devastated by the 2004 tsunami. The recovery of forests in that area is an example of
A. secondary succession. B. facilitation. C. the diversity-stability hypothesis. D. primary succession. E. island biogeography.
What does not happen in the cytokinesis of plant cells?
A. Vesicles from the golgi apparatus move along the microtubules and fuse form cell plate. B. Cell wall forms between the two daughter cells.. C. The two nuclei are segregated into separate daughter cells. D. When the vesicles fuse, their membranes contribute to the formation of plasma membrane on either side of the cell plate. E. Formation of cleavage furrow to separate the cells.
Small circular DNA molecules capable of replicating and containing genes that are useful but not necessary to the bacterium are called ________.
Fill in the blank(s) with the appropriate word(s).
The megaspore produces a gametophyte with ____ cells.
A. 2 B. 7 C. 8 D. 14 E. 16