Sporopollenin is
A. pollen that is produced in a sporophyte.
B. a tough protective covering on spores.
C. a capsule housing pollen.
D. food stored in pollen for the growing embryo.
E. the conversion of pollen to spores.
Answer: B
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In addition to their characteristic cilia, most ciliates contain two types of
A. nuclei. B. chloroplasts. C. flagella. D. wood-digesting enzymes. E. cysts.
When auditory hair cells bend they ____
a. produce action potentials b. are inhibited c. release neurotransmitters d. cause a pressure wave to strike the eardrum e. inhibit the auditory nerve
Since 1750, the main cause of increased carbon dioxide being released into the atmosphere is:
a. the burning of fossil fuels such as coal and gasoline. b. the burning of wood. c. cattle production. d. erosion. e. decomposition.
Which of the following statements would not be consistent with the theory for the endosymbiotic origin of mitochondria and chloroplasts?
A. Mitochondria and chloroplasts have some enzymes unique to them. B. Genes encoded within mitochondria and chloroplasts indicate a closer relationship to prokaryotes than do most nuclear genes. C. The composition of the inner membrane of chloroplasts and mitochondria is similar to the plasma membrane of prokaryotic cells. D. Mitochondria and chloroplasts have their own DNA enclosed within a nuclear envelope. E. The composition of the outer membrane of chloroplasts and mitochondria is similar to the plasma membrane of eukaryotic cells.