The microtubules of the mitotic spindle originate from the ____ in both plant and animal cells
a. microtubule organizing centers (MTOCs)
b. centromere
c. chromatid
d. centriole
e. centrosome
ANSWER: a
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Which of the following examples describes a behavioral pattern that results from a proximate cause?
A) A cat kills a mouse to obtain nutrition. B) A male sheep fights with another male because it helps to improve its social position. C) A female bird lays its eggs because the amount of daylight is decreasing slightly each day. D) A goose squats and freezes motionless to escape a predator. E) A cockroach runs into a crack in the wall to avoid being stepped on.
One consequence of global warming is the melting of the glaciers and the resulting rise in sea levels. What will likely be the direct effect of this increase in sea levels on coral reefs?
A) Productivity will increase as the pure water from the glaciers dilutes the nutrients in the sea. B) Coral reefs in shallow waters will grow more rapidly due to added protection against harmful UV radiation. C) Coral reefs will be stimulated to grow faster due to the dilution of the seawater's salt content. D) Productivity will decrease as nutrients trapped in the glacial ice are released and spread throughout the oceans by currents. E) Coral reefs in deeper waters will die because insufficient light reaches them for photosynthesis.
Matter composed of a single type of atom is known as a(n)
A) element. B) mineral. C) molecule. D) compound. E) electron.
Which is the largest part of the brain?
A. midbrain B. cerebellum C. medulla oblongata D. diencephalon E. cerebrum