Gills are unsuitable for animals living on land because
A) the large external surface area of gills would allow dehydration of the animal.
B) air cannot diffuse across the gill surface.
C) there is no way to get air into the gills.
D) gills require high blood pressure.
Answer: A
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Growing useful mutants that develop from callus culture is called
a. fragmentation. b. protoplast fusion. c. somaclonal section. d. grafting. e. apomixis.
The rapid onset of overproduction of immature white blood cells is known as:
a. anemia. b. hemolytic anemia. c. leukemia. d. thrombocytopenia. e. pernicious anemia.
An organism is discovered that thrives in both the presence and absence of oxygen in the air. Curiously, the consumption of sugar increases as oxygen is removed from the organism's environment, even though the organism does not gain much weight
This organism _____. A) is a normal eukaryotic organism B) is photosynthetic C) is an anaerobic organism D) is a facultative anaerobe
The most commonly accepted tree of life suggests that, after the origin of life, which of the following events occurred?
a. Bacteria arose from the first self-replicating, metabolizing cells. b. There was a split between the bacteria and a line that gave rise to the prokaryotes and eukarya. c. The fusion of a bacterium and a virus gave rise to the eukarya. d. The fusion of a bacterium and an archaeon split from the protist line. e. None of the above