If the tallest and shortest individuals of a population of humans do not survive and reproduce as well as the individuals of "average" height, which type of selection would most likely result?
A) Directional selection B) Artificial selection
C) Stabilizing selection D) Disruptive selection
C
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Why do chemical reactions tend to speed up when the concentration of the reactants is increased?
A) The reactants move faster. B) The reactants collide more often. C) The reactants have greater energy. D) All of the listed responses are correct.
Which of the following reasons explain why bacteria can continually divide?
A. Because they are so simple. B. Because their DNA is circular so it never shortens after replication. C. Because DNA replication is much quicker in bacteria than in eukaryotes. D. Because they have plasmids. E. Because they only have one chromosome.
A codon is a three-base sequence of
A) mRNA that codes for an amino acid. B) rRNA that codes for an amino acid. C) tRNA that codes for an amino acid. D) mRNA or tRNA that codes for an amino acid.
Modern whales have bones that are remnants of a pelvis and legs that serve no function. This would be an example of a/an:
A) homologous structure. B) analogous structure. C) vestigial character. D) polygenic character.