Plants from the genus Solanum include such common vegetables as potatoes and eggplants. The many species include some plants native to tropical West Africa as well as closely related species native to tropical South America. What might you reasonably
conclude?
A) The group must have mutated twice.
B) The trunks of the plants were used as canoes to cross the Atlantic Ocean.
C) Convergent evolution occurred.
D) West Africa and South America were once joined.
Answer: D
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Match the following items with the correct phrases.
_______1. In the nitrogen cycle, bacteria called ____________________ convert atmospheric nitrogen gas into ammonia in the soil. _______2. ____________________ live in the root nodules of legumes such as alfalfa and clover. _______3. ____________________ are capable of converting the nitrogen within a dead plant or animal into ammonia in the soil. _______4. In the nitrogen cycle, soil organisms called ____________________ convert ammonia into nitrites, and nitrites into nitrates. _______5. In the nitrogen cycle, soil organisms called ____________________ convert the nitrogen in nitrates to nitrogen gas in the atmosphere. a. cyanobacteria b. denitrifying bacteria c. nitrifying bacteria d. nitrogen-fixing bacteria e. saprophytes
If you were to compare the resting potential of a neuron to a battery, which way is the battery oriented?
A typical AA battery has a potential of 1.5V. One can think of the potential in a neuron as having similarities to that of a battery. A. positive terminal outside of the cell, and negative terminal inside B. positive terminal inside of the cell, and negative terminal outside C. positive terminal pointing toward the axon, negative terminal toward the dendrite D. positive terminal pointing toward the dendrite, negative terminal toward the axon E. both terminals inside the cell soma
Male gonads are __________, which produce sperm
and the sex hormone __________. Fill in the blank(s) with the appropriate word(s).
Surface currents in the ocean typically
A) flow most strongly from west to east in equatorial regions. B) are colder on the western side of continents. C) flow counterclockwise in gyres in the Northern Hemisphere. D) flow unimpeded from east to west just north of Antarctica.