At what stage of mitosis do sister chromatids become full-fledged chromosomes?
A. cytokinesis
B. telophase
C. anaphase
D. metaphase
E. prophase
Answer: C
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Which of the following does not tend to promote speciation?
A) the founder effect B) gene flow C) natural selection D) polyploidy E) disruptive selection
Friedrich Miescher, after he began to study the chemical composition of the nucleus, was one of the first to ____
a. propose the nuclear structure of the H5N1 virus b. discover that the nucleus contained DNA but no proteins c. discover that human and mice chromosome chemistry differs greatly d. isolate DNA and propose its structure e. isolate and purify a cellular organelle
From his observations of organisms in the Galapagos islands, Darwin reasoned that _____.
A. all island species should be similar to each other B. organisms had adapted to new environments, giving rise to new species C. the shape of a bird's beak does not affect its ability to survive and reproduce D. the organisms in the Galapagos had been specially created to thrive in that environment E. none of the above
Early sexual maturity is predicted to result in
A) lower overall lifetime reproduction. B) higher overall lifetime reproduction. C) higher reproduction earlier in life. D) higher reproduction later in life.