Environmental resistance may limit the size of populations by
A) increasing both birth and death rates.
B) increasing death rates and/or decreasing birth rates.
C) decreasing death rates and/or increasing birth rates.
D) changing the biotic potential.
E) decreasing both birth and death rates.
B
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Which pieces of evidence support the radial loop-scaffold model of DNA packaging?
A) Histone-depleted metaphase chromosomes still maintain their X-like shapes. B) Radial loop-scaffold DNA has been isolated and crystallized. C) Topoisomerase II assists in 100 Å packaging. D) Each G band formed by Giemsa staining represents a chromatin loop.
Evolution is genetic change in __________ that occurs over time
a. an individual b. a population c. a community d. an ecosystem e. the biosphere
A gene that produces a protein important in more than one biochemical pathway is
a) dominant. b) recessive. c) pleiotropic. d) codominant. e) incomplete dominant.
If red blood cells are taken from the body and placed in a hypertonic solution, what happens to the cells?
A) The cells remain unchanged due to equal solute concentrations inside and outside the cells. B) The cells remain unchanged due to equal water concentrations inside and outside the cells. C) They become white blood cells. D) The cells swell and burst because water moves into them. E) The cells shrivel up because water leaves them.