Water that moves through nonliving regions of root, such as air spaces in root tissue, is following the ____
a. symplastic pathway only
b. transmembrane and symplastic pathways
c. transmembrane pathway only
d. apoplastic, transmembrane, and symplastic pathways
e. apoplastic pathway only
ANSWER: e
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A fixed action pattern is a sequence of behaviors that, once triggered, is ____
Fill in the blank with the appropriate word.
In the figure above, the viral DNA in the
lysogenic pathway
a. has been destroyed by host bacterial enzymes. b. is integrated into the bacterial chromosome. c. has been copied and changed into bacterial DNA. d. is no longer present. e. has been transcribed into RNA
Heart excitation originates in the
a. atrioventricular node. b. intercalated disk. c. sinoatrial node. d. pericardium. e. endothelium.
Which of the following patterns occurs with respect to geographic distribution of species diversity?
A) Diversity increases with increasing latitudes. B) Diversity increases with increasing longitudes. C) Diversity increases with decreasing latitudes. D) Diversity increases with decreasing longitudes.