Which of the following represents a density-independent cause for the extinction of wooly mammoths?
a. human hunting
b. reduction of habitat
c. climate change
d. disease
c. climate change
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What protein is responsible for creating new strands of mRNA?
a. DNA polymerase b. RNA polymerase c. telomerase d. primase
In the structural figure of a nephron shown above, which part is the glomerulus?
a. A b. B c. C d. D e. E
For each of the following lac operon mutations, state whether transcription of ß-galactosidase will increase, decrease, or be unaffected. a. Plac- b. lacY+ c. lacI- d. lacO- e. lacA-
What will be an ideal response?
A scientist is studying a population of crickets and finds that there is variation in the songs used by males to call for mates. Some males call with high-pitched three-chirp songs and some call with low-pitched four-chirp songs. However, offspring from the two types of males are able to interbreed so the scientist classifies the population as a single cricket species and goes on to another project. One year later a mutation arises in a female cricket that makes her unable to hear high frequencies. Ten years later a graduate student returns to the same cricket population and discovers that there are now two distinct cricket species in the area although they appear morphologically identical. What is the most likely explanation?
A. Gametic isolation has led to sympatric speciation. B. Habitat isolation has led to allopatric speciation. C. Temporal isolation has led to allopatric speciation. D. Mechanical isolation has led to sympatric speciation. E. Sexual selection has led to sympatric speciation.