The peacock butterfly experiment demonstrated that ________
a. only spots had any measurable effect on the number of butterflies killed
b. sound was more important than spots in butterfly defense against predatory birds
c. spots were more important than sound in butterfly defense against predatory birds
d. sound had no effect on the number of butterflies killed
c
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Cells are treated with a drug that blocks purine synthesis. Which bases would not be made in those treated cells?
A. cytosine, thymine, and uracil B. adenine and guanine C. adenine and thymine D. cytosine and guanine
Why might the sex ratio of bird species in the figure change from as they grow from juveniles to adults?
A) Nesting females are vulnerable to predatory attack. B) Males that are unable to mate die quickly. C) Females are less able to feed effectively as juveniles. D) More females are required to sustain the population.
One method of maintaining the genetic isolation of a population is the inability of sperm to fertilize eggs of a different species. This is called
A) gametic incompatibility. B) behavioral isolation. C) hybrid inviability. D) ecological isolation. E) temporal isolation.
Multicellular organisms with hard exoskeletons, segmented bodies and four pairs of jointed legs in the adult stage are
A) algae. B) arachnids. C) insects. D) helminths. E) lice.