Decompression sickness is caused by
a. a rapid rise of carbon dioxide in the blood.
b. lack of oxygen in the tissues.
c. bubbles of nitrogen in the blood.
d. a rapid decrease in blood pH.
e. descending too rapidly into deep water.
Answer: c
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The individualistic model of a community as an assemblage coexisting primarily of species similar in their physiological requirements was proposed by
A. Frederic Clements. B. Charles Darwin. C. Henry Allan Gleason. D. David Tilman. E. Joseph Connell.
When electrons in a covalent bond are not equally shared, the molecule is said to be
A. polar. B. nonpolar. C. lopsided. D. unable to form hydrogen bonds.
A polymer with the sequence 5' ACGTACGAATAG 3' is a
A. polysaccharide. B. piece of RNA. C. piece of DNA. D. protein.
Most plants absorb water and minerals from the ________ and transport them through the ________.
A. atmosphere; xylem B. soil; phloem C. atmosphere; phloem D. soil; xylem