Which of the following best describes an ocean as an open system?
a. It does not exchange matter with its surroundings.
b. It absorbs but not releases energy.
c. It absorbs and releases energy.
d. It exchanges energy but not matter with its surroundings.
Ans: c. It absorbs and releases energy.
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What is the name of the mesoderm-derived, calcium-stiffened structures that comprise the internal skeleton of echinoderms?
a. ampullae b. ossicles c. madreporites d. radial canals
Sugars can cyclize if they contain _______ or more carbons.
a. four b. five c. six d. eight
Vibrio cholerae causes Asiatic cholera. It has a corkscrew shape, so we would say it has this form
A) coccus B) bacillus C) spirillum D) clostridia
Given a log phase bacterial culture with 1 x 106 cells per ml and a generation time of 30 minutes, how long does it take the culture to reach a density of 6.4 × 107 cells per ml?
A. 1 hour B. 2 hours C. 3 hours D. 4 hours