With __________ growth, a small population starts growing slowly, then grows rapidly, and then
levels off once __________ is reached. Fill in the blank(s) with the appropriate word(s).
logistic; carrying capacity
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Which of the following is an incorrect statement about the regulation of populations?
A) The logistic equation reflects the effect of density-dependent factors, which can ultimately stabilize populations around the carrying capacity. B) Density-independent factors have an increasingly greater effect as a population?s density increases. C) High densities in a population may cause physiological changes that inhibit reproduction. D) Because of the overlapping nature of population-regulating factors, it is often difficult to precisely determine their cause-and-effect relationships. E) The occurrence of population cycles in some populations may be the result of crowding or lag times in the response to density-dependent factors.
At the end of an experiment, a conclusion is formed based on:
A. the feelings or beliefs of the scientist conducting the experiment B. the needs of the group funding the experiment C. the general observations during the experiment D. the statistical analysis of the experiment
Which of the following is NOT a mechanism that has been proposed to explain receptor dimerization of protein-tyrosine kinases?
a) ligands serving to link two receptors together b) ligand-mediated dimerization c) receptor-mediated dimerization d) inactive receptors possessing binding sites for another receptor
A plant scientist was hired by a greenhouse operator to devise a way to force iris plants to bloom in the short days of winter. Iris normally blooms as long-day (short-night) plants. Which of the following has the best chance of creating iris blooms in winter?
A) Artificially increase the period of darkness in the greenhouse. B) Increase the temperature to more closely follow summer temperatures. C) Alternate four hours of darkness with four hours of light repeatedly over each 24-hour period. D) Interrupt the long winter nights with a brief period of light.