In prophase I of spermatogenesis, there are ____ chromatids
a. 23
b. 46
c. 69
d. 92
e. 115
ANSWER: d
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Which of the following statements concerning radiolarians is FALSE?
a. They lack shells. b. They are actinopods. c. They are rhizarians. d. They have axopods. e. They are important constituents of plankton.
Los Angeles, California, has an average daily temperature between 70°F and 80°F for most of the year. There's very little rainfall except during a rainy season beginning in the fall. What does this describe about the city's conditions?
A) climate B) weather C) biome D) ecosystem
As you are working on this test question, which of the following brain waves will be the most active?
a. alpha rhythm patterns b. beta rhythm patterns c. delta waves d. gamma waves e. theta waves
What ensures the one-way direction of an action potential?
A. Conduction of an action potential is an all-or-none event. B. An axon can conduct a volley of action potentials very quickly. C. Action potentials are self-propagating. D. An action potential at one node causes an action potential at the next node. E. As soon as the action potential has passed by, that portion of the axon undergoes a short refractory period.