Restriction enzymes are
A. proteases.
B. lipases.
C. endonucleases.
D. exonucleases.
C. endonucleases.
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In a growing population, the youngest age classes have
A. the highest number of deaths/year. B. the fewest individuals. C. the most individuals. D. the smallest number of deaths/year. E. the most individuals and the largest number of deaths/year.
A mycorrhiza is a relationship between a fungus and
a. another fungus. b. animals. c. plants. d. protists.
Which phylum is most closely related developmentally to the first vertebrates?
a. Echinodermata b. Arthropoda c. Mollusca d. Annelida e. Chelicerata
The methanogens, producers of methane gas, require environments that
A. have abundant oxygen and CO2. B. are very acidic. C. have sunlight. D. are extremely cold. E. are anaerobic with hydrogen gas and CO2.