In looking at the species—area plot in the figure above, what can be concluded?
A) Number of bird species increases linearly with island area.
B) Number of bird species remains the same on these various islands.
C) Diversity is independent from island area.
D) Number of bird species increases exponentially with island area.
Answer: A
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Molecular clocks are usually calibrated based on
A. guesses about the rates of mutations in a particular gene. B. observed rates of mutation in a particular gene. C. the first shared common ancestor for species known from the fossil record. D. comparing the gene to similar genes in other kingdoms. E. the date when two species diverged from a common ancestor.
Cells that are programmed to die, shrivel and shrink in a process called
A. encoded death. B. necrosis. C. totipotency. D. induction. E. apoptosis.
Which events and features are correctly associated with the roots during the pressure-flow model of phloem transport?
Select one: a. Sugar is stored in the sink. Cells use the sugar for cellular respiration. Water exits by osmosis and returns to the xylem. b. Sugars are stored in the source. Cells use the sugar for cellular respiration. Water exits by osmosis and returns to the xylem. c. Sugar is stored in the sink. Cells use the sugar for photosynthesis. Water exits by osmosis and returns to the xylem. d. Sugar is stored in the sink. Cells use the sugar for cellular respiration. Water exits by diffusion and returns to the phloem. e. Sugar is stored in the source. Cells use the sugar for photosynthesis. Water exits by osmosis and returns to the xylem.
What strategy does the body use for blood glucose homeostasis?
A. Energy stores in bone allow for quick glucose release B. Glucose usage by the brain is shut down when necessary C. The action of two antagonistic effectors D. Release of hormones by the brain