Which of the following are biotic interactions in an ecosystem?
A. competition and competitive exclusion
B. mutualism and parasitism
C. herbivory and predation
D. None of the answers are biotic interactions.
E. All of the answers are biotic interactions.
Ans: E. All of the answers are biotic interactions.
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Which three factors determine the ecological efficiencies of consumers?
a. assimilation and harvesting efficiencies, and nutrient volume b. assimilation and harvesting efficiencies, and water volume c. production, harvesting, and assimilation efficiencies d. production and harvesting efficiencies, and amount of sunlight e. production and harvesting efficiencies, and percentage of decomposers
How a male rat behaves toward a female has been shown to alter ____ in her brain, presumably then
activating ___ receptors in some neurons.
a. peptide hormones; neurotransmitter d. neurotransmitter release; testosterone b. neurotransmitter release; steroid hormone e. neurotransmitter release; peptide hormone c. cAMP kinases; steroid hormone
The distribution of mammalian fossils on Australia, South America, and Africa help support the idea of continental drift.
Answer the following statement true (T) or false (F)
Which of the following statements about RNA polymerase in bacteria is INCORRECT?
A. It binds the promoter region of a gene. B. It dissociates from the DNA at the terminator. C. It is bound to a sigma factor during initiation of transcription. D. It synthesizes RNA. E. It catalyzes the addition of nucleotides to the 5?end of a growing RNA strand.