Explain the need for a null hypothesis, especially in ecology and evolution. What does a null hypothesis accomplish?
What will be an ideal response?
ANSWER: A null hypothesis is a statement of what a researcher would see if the hypothesis being tested
is wrong. Ecologists usually tackle systems that are too complex to control, so a null
hypothesis anticipates, or provides, an alternative hypothesis to answer questions
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The key characteristic of the herpes family of viruses is
A. their ability to transform normal cells into cancer cells. B. their propensity to destroy bone marrow. C. their ability to cause organ death. D. their ability to stay in host cells without causing symptoms.
Clams and other bivalves typically have:a
dermal gills. b. gills adapted for trapping food. c. an operculum. d. book lungs. e. swim bladders.
Steve Hubbell's work at Barro Colorado Island, Panama, points to which of the following as an impediment to the colonization of gaps by tree species?
A) lack of species capable of surviving in gaps B) competitive displacement C) dispersal limitation D) predation
Classification.The items below are processes that occur during different cellular reaction or metabolic pathways. Answer the following questions by selecting the correct term.
A. This process occurs when an electron transport molecule gives up an electron. B. This process occurs when an electron is received by an electron acceptor molecule, such as NADP+. C. This process leads to the formation of ATP from ADP plus inorganic phosphate. D. This process involves a series of enzymes and requires membranes.