Which of the following carry impulses toward the cell body of a neuron?
Axons
Dendrites
Glial cells
Schwann cells
B. Dendrites
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In the Sierra Nevada Mountains of California there are many populations of the checkerspot butterfly Euphydryas editha. You notice that females of one population lay their eggs near the tip of a plant's stem (population A)
Females of another population in the same area lay their eggs at the base of the stem on a different type of plant (population B). The young hatch out as caterpillars; they live on the host plant and eat its leaves. Is the information above a complete description of the butterflies' niche? A. Yes, because I know the butterflies live in the Sierra Nevada. B. Yes, because both eggs and adults are described above. C. Yes, because eggs, young, and adults are described above. D. No, because I also need to know what the adults eat. E. No, because a complete niche includes physical and biological factors.
Hydrophobic interactions of the tails of
phospholipids produce
a. a lipid bilayer. b. hydrolysis of the fatty acids. c. a protein membrane. d. a cytoskeleton. e. a nonpolar membrane
“Acidic” is an appropriate description for all
EXCEPT which one of the following? a. excess hydrogen ions b. the contents of the stomach c. magnesium hydroxide d. HCl e. a pH less than 7
Which of the following statements about photoreceptors is NOT true?
A. A compound eye as seen in insects has many different visual units, each containing a lens. B. Photoreceptors differ in complexity in different kinds of animals. C. Image-forming eyes are found only in vertebrates. D. The simplest photoreceptors only recognize the presence and intensity of light. E. Eyespots in planaria allow the direction of light to be determined.