The affinity of hemoglobin for oxygen is _______ by lowered blood pH and this ______ oxygen delivery to tissues.
A. increased, increases
B. increased, decreases
C. decreased, increases
D. decreased, decreases
E. not affected, does not affect
C. decreased, increases
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Vernalization can result in the remodeling of chromatin in some species, which means:
A. plants are able to "know" if they have experienced winter. B. plants can pass on acquired changes to their offspring. C. plants may grow new cells, and those cells will not "know" they have experienced winter. D. products of mitosis will not "remember" winter. E. products of meiosis will "remember" winter.
Which type of species interactions will be beneficial to both species involved?
a. Commensalism b. Mutualism c. Predation d. Interspecific competition e. Herbivory
Why do higher-latitude ecosystems experience more pronounced seasons than ecosystems at equatorial latitudes?
A) Earth is tilted on its axis as it orbits the sun annually. B) The mass of the continents is greater at the equator, which evens out temperature variations in ocean circulation. C) Heated air rises at the equator and falls at mid-latitudes. D) Air currents generated by Earth's rotation have stronger effects at higher latitudes. E) Ocean currents moderate near-shore environments.
Populations of amphibians, including frogs and toads, have been plagued by disease and high rates of deformity. A recent study investigated whether problems among the populations have arisen due to poisons from chemicals associated with agriculture. Biologists from the University of Florida collected local adult cane toads (Bufo marinus) from more than 20 different locations. Toads were collected from areas close to agriculture; both large-scale and small-scale farms as well as from suburbs. At collection sites where 50-97% of the adjacent land was farmed, males showed high levels of feminization. Feminized male toads were similar in color to females and had lower levels of testosterone and often also deformed gonads. These changes can lead to sterile males or changes in behavior that
prevent mating from occurring. Which of the following statements would be considered a hypothesis for this study? What will be an ideal response?