When several possible phylogenetic trees can be produced from a data set, the most parsimonious tree:
A. is the one that shows the smallest number
of evolutionary changes.
B. is the one that shows the largest number
of nodes.
C. is the one that shows the largest number
of analogous characteristics.
D. is the one that shows the smallest number
of synapomorphies.
E. is the one that shows the smallest number
of branches.
A
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Evolution can only occur in a population when _____
a. mating is random b. there is selection pressure c. neither is necessary
On a class field trip, students swabbed, dug, and dipped samples of life from numerous places around campus. Back in the lab, one of the organisms found was unknown to the professor, or any reference books available, and could not be identified. It came from the edge of a marsh, and the sample smelled of hydrogen sulfide (rotten eggs). The single cells were found to survive only in a container that had sulfate in it, but also had the oxygen removed by burning a candle. This is likely an organism that uses for cellular respiration.
A. lactic acid fermentation B. alcohol fermentation C. only glycolysis D. aerobic respiration E. anaerobic respiration
There is a decrease in our ability to fight infection as we age. Which lymphoid organ may have a role in this decline?
What will be an ideal response?
During stressful situations, epinephrine initiates all of the following actions except:a
constriction of the blood vessels to the skin. b. constriction of the blood vessels to the heart. c. dilation of the blood vessels to the brain. d. an increase in metabolic rate. e. an increase in blood glucose levels.