. Magnesium has 12 protons. How many electrons are
in its third energy level?
a. 2
b. 4
c. 6
d. 8
e. 10
Answer: a
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Physical exchange between homologous chromosomes (crossover) occurs during the fourstrand stage of meiosis
A. true B. false
Which is the principle waste product if the body has excess amino acids?
a. Ammonia b. Nitrogen c. Urea d. Carbon dioxide
What marine biology laboratory inspired other facilities of the same kind?
a. Marine Biological Laboratory at Woods Hole b. Friday Harbor Laboratories of the University of Washington c. Museum of Comparative Zoology at Harvard University d. Scripps Institute of Oceanography in California
How a plant cell responds to a hormone depends on the
A) concentration of the hormone. B) "shelf life" of the hormone. C) presence of other plant cells nearby. D) cell that secretes the hormone. E) amount of available sunlight.