For every million liters of water in the world, only about ____ liters are in a form that can be used for
human consumption or agriculture.
a. 0.6
b. 6
c. 60
d. 600
e. 6,000
B
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Which statement best describes the difference between cell division in plant and animal cells?
a. Cytokinesis occurs by formation of a cleavage furrow in animal cells, but not plant cells. b. Cytokinesis occurs by formation of a cleavage furrow in plant cells, but not animal cells. c. Centrosomes play an important role in spindle formation in plant cells, but not in animal cells. d. Chromosome replication occurs during interphase in animal cells, while in plant cells, replication occurs when the nuclear envelope disintegrates. e. Animal cells divide via the cell cycle whereas plant cells divide by binary fission.
If all of the phloem is stripped from around a tree in
a process known as girdling, a. the plant will stop growing. b. the vascular cambium will be destroyed so that the plant can no longer grow. c. the shoot system will get no moisture or minerals. d. the roots will starve and eventually the plant will die. e. there will be no problems unless the tree becomes infected by insects and fungi.
What happens when DNA polymerase replicating DNA encounters RNA polymerase transcribing DNA in the same direction?
What will be an ideal response?
Key mechanisms of horizontal gene transfer include all of the following except
A) transformation. B) transposons. C) reproduction. D) conjugation. E) transduction.