During a field trip, an instructor touched a moth resting on a tree trunk. The moth raised its forewings to reveal large eyespots on its hind wings. The instructor asked why the moth lifted its wings
One student answered that sensory receptors had fired and triggered a neuronal reflex culminating in the contraction of certain muscles. A second student responded that the behavior might frighten predators. Which statement best describes these explanations?
A) The first explanation is correct, but the second is incorrect.
B) The first explanation refers to proximate causation, whereas the second refers to ultimate causation.
C) The first explanation is biological, whereas the second is philosophical.
D) The first explanation is testable as a scientific hypothesis, whereas the second is not.
E) Both explanations are reasonable and simply represent a difference of opinion.
Answer: B
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Tropical; grassland with scattered trees; seasonally dry; nutrient poor soils; large grazing mammals.
A. desert B. savanna C. taiga D. temperate grassland E. tropical rain forest
An example of a beneficial mutation is
A) a mutation in collagen that causes the skin to be extra stretchy. B) the mutation that causes sickle cell disease. C) a mutation in the CCR5 gene. D) a mutation in a cytokine gene that causes an allergy.
Which of the following events does NOT occur in
prophase II but does occur in prophase I? a. crossing over b. pairing of homologues c. spindle formation d. crossing over and pairing of homologues only e. crossing over, pairing of homologues, and spindle formation
All of the following are components of nonspecific immunity EXCEPT
A. complement. B. B cells. C. skin. D. lysozyme. E. phagocytes.