Which of the following statements does NOT follow from the information provided in the graph above?
a) There have been five documented mass extinctions in the last 500 million years.
b) During the most recent mass extinction, the dinosaurs were exterminated.
c) Mass extinctions are predictable.
d) During "The Great Dying" a greater percentage of the earth's families went extinct than at any other time.
e) Extinctions are always occurring naturally.
Ans: c) Mass extinctions are predictable.
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Your friend is having difficulty keeping track of the energy flow from glucose through glycolysis, the Krebs cycle and electron transport. Your best advice would be to
A. follow ATP production. B. follow the protons. C. follow NAD+ production. D. follow the electrons.
Concerning the sex chromosomes, which of the
following is correct? a. The Y chromosome carries a greater number of genes for nonsexual traits than does the X. b. X and Y are different in size but carry nearly equal numbers of genes. c. The X chromosome carries more genes for nonsexual traits than does the Y. d. The X chromosome carries only gender-related genes. e. The X chromosome carries the SRY gene.
Trypanosomiasis is spread by
A. contaminated water. B. fleas on rats. C. tsetse flies. D. mosquitoes. E. airborne droplets.
Which of the following statements about plant embryo development is correct?
A. The plant hormone abscisic acid is important in the development of the shoot-root axis. B. The development of the shoot and root apical meristems is controlled independently. C. The protoderm establishes the procambium tissue in the young plant embryo. D. The suspensor forms from the shoot apical meristem before development of the root apical meristem.