Temperate grasslands and temperate deciduous forests are two different biomes that are located in the same latitudes. Which one of the following abiotic conditions is most likely to account for the differences in their community composition?
A. temperature
B. precipitation
C. sunlight
D. soil nutrients
E. a rain shadow
B. precipitation
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Why are food chains relatively short?
A) Top-level feeders tend to be more numerous than lower-trophic-level species. B) Top-level feeders tend to be small but are capable of conserving more energy. C) Longer chains are less stable and energy transfer between trophic levels is inefficient. D) There are only so many organisms that are adapted to feed on other types of organisms. E) Food chain length is ultimately determined by the photosynthetic efficiency of producers.
Bioassays
(a) are performed in a test tube using killed cells. (b) expose a population of living organisms to a test substance. (c) are used for chemotherapy. (d) are none of the above.
Which of the following is/are a biological "population?"
A. all of the variable-colored ladybird beetles of the species Harmonia axyridis in a forest B. all male and female English sparrows that reside in your community C. all of the corn plants in a cornfield D. all of the human population of a rural western town E. All of the choices are correct.
Wood frogs freeze solid during the winter and then thaw in the spring. As the freezing progresses, blood circulation stops. How would you expect cells not being served by the circulatory system to produce ATP during this time, and what by-product would
you expect to build up in the cells? A) aerobic respiration and CO2 B) fermentation and lactate C) fermentation and alcohol D) photosynthesis and O2