Once we have used character data to infer a tree, how can we be certain this tree is correct?
a. We can't; we can only estimate a ‘best fit.'
b. We can test statistical confidence that the tree or some portion of it is correct.
c. In most cases, we can ascertain whether our tree is correct with 95% confidence.
d. All of the above.
e. None of the above.
B
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Using the great lubber grasshopper as a model, Walter Sutton observed:
A. separation of maternal and paternal chromosomes during mitosis. B. replication of chromosomes during meiosis. C. crossing over of homologous chromosomes. D. pairing of homologous chromosomes during mitosis. E. pairing of homologous chromosomes during meiosis.
Should a genetic abnormality arise, ________ prevent a cell from progressing uncontrollably through the cell cycle.
A. cis-acting elements B. checkpoint proteins C. trans-acting elements D. growth factors E. Ras's
The cells least affected by Luft's Syndrome are
a. skeletal muscle cells. b. heart muscle cells. c. brain cells. d. body cells with high energy needs. e. reproductive cells.
Which is the best example of physical weathering?
1. the formation of a sandbar along the side of a stream 2. the cracking of a rock caused by the freezing and thawing of water