Which of the following pathways are composed of the axons of neurons with their cell bodies in the brain stem
a) spinothalamic
b) rubrospinal
c) spinocerebellar
d) corticospinal
Ans: b) rubrospinal
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Which of the following best states the hypothesis tested by Abrams and Townsend while investigating the natural selection of copepods that avoid predation of bioluminescent dinoflagellates?
A. Copepods that avoid bioluminescent dinoflagellates have a smaller chance of being eaten by predators than do copepods that remain near and feed on the bioluminescent dinoflagellates. B. None of the answer choices is correct. C. The light emitted by bioluminescent dinoflagellates is of sufficient wavelength and energy to be dangerous to feeding copepods. D. The bioluminescent dinoflagellates produce enough light that they can also photosynthesize at night, harming the copepods. E. Bioluminescent flagellates benefit from selection of flashing, because it startles the copepods.
A diploid somatic ("body") cell has 2n = 20 chromosomes. At the end of mitosis, each daughter cell would have ________ chromosomes. At the end of meiosis I, each daughter cell would have ________ chromosomes
At the end of meiosis II, each daughter cell would have ________ chromosomes. A) 20, 20, 20 B) 20, 10, 10 C) 20, 20, 10 D) 10, 10, 10
The diffusion of water across a semipermeable membrane from an area of lower solute concentration to an area of higher solute concentration is referred to as ____
Fill in the blank with the appropriate word.
A(n) ____ gradient is created as ions diffuse across membranes
a. chemical b. electrochemical c. negative d. electrical e. active