Niche overlap initially leads to:
a. mutualism
b. commensalism
c. predation
d. competition
e. parasitism
d
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Which of the following are examples of homologous structures?
a. whale flipper and cat leg b. human eye and octopus eye c. bird and insect wings d. body shape of sharks and dolphins e. penguin wing and fish fin
A positive feedback loop is one that tends to amplify a process. Why would the effect of deforestation on the water cycle be considered a positive feedback loop?
A. Because deforestation leads to reduced nutrient uptake during the growing season, which results in more fertile soil. B. Because deforestation leads to new types of habitat which leads to greater species diversity. C. Because deforestation leads to an increase in the concentration of nutrients in run off, which then leads to eutrophication. D. Because deforestation leads to a decrease in precipitation, which results in further loss of vegetation.
In plant cells, auxin binds to a
a. cell surface receptor and triggers the ras/raf pathway. b. nuclear receptor that changes its shape so that it can bind to and activate genes. c. receptor ubiquitin ligase that stimulates the degradation of transcriptional repressors, resulting in activation of genes. d. cell surface molecule that stimulates fluid uptake.
Elementary bodies of chlamydiae are specialized for reproduction rather than infection.
Answer the following statement true (T) or false (F)