Which statement factors into artificial but not natural selection?
A. Most organisms are capable of producing more offspring than typically survive.
B. Phenotypic variation can influence reproductive success.
C. Phenotypic variation within a species is due in part to inherited characteristics.
D. Phenotypic variation exists within populations.
E. Phenotypic variation of a species has variable appeal to humans interested in that species.
Answer: E
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The genus of bacteria that undergoes cell division in random planes, forming grape-like clusters of round bacteria, are the ________.
What will be an ideal response?
In the 1920s and 1930s, terrible dust storms carried away tons of good soil from farmland in western Oklahoma. Which of the following would be a result?
A) massive immigration B) shortening of the doubling rate C) reduction in carrying capacity D) exponential growth of human population
In a negative feedback system, which one of the following statements is TRUE?
A) A sensor detects a stimulus, which in turn amplifies the original disturbance. B) Deviations from a desired condition are automatically detected and counteracted. C) Homeostasis cannot be re-established until the effector is turned off. D) The effector activates the sensor. E) A sensor is not needed because the body anticipates the coming change.
In a normal cell, tumor suppressors are responsible for (select all correct choices):
A. increasing the rate of cell division. B. correcting replication errors. C. signaling death in a highly defective cell. D. signaling the initiation of DNA replication.