The endosymbiont hypothesis proposes all of the following EXCEPT
A. chloroplasts originated when a nucleated cell engulfed a cyanobacterium.
B. prokaryotes evolved when an aerobic bacterium engulfed a cyanobacterium.
C. a nucleated cell engulfed an aerobic bacterium which evolved into mitochondria.
D. mitochondria and chloroplasts were once free-living bacteria.
Answer: B
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The changes that were necessary to cope with the heavy energy demands of flight in birds include all of the following except
A. efficient respiration. B. efficient circulation. C. endothermy. D. auxiliary air sacs and hollow bones. E. a three-chambered heart.
What component is located on the exterior surface of a prokaryote?
a. flagellum b. cytoplasm c. plasma membrane d. DNA e. nucleoid
The human large intestine is about _____ in length.
A. 1.5 m B. 6 m C. 7.5 m D. 15 m E. 30 m
Which chemical, contained in the granules of basophils, helps prevent blood clot formation?
a. histamine b. leukotrienes c. prostaglandins d. heparin e. SRS-A