Ecological efficiency is usually higher in aquatic ecosystems than on land, in part because photosynthetic protists do not make ____, as most land plants do.
A. chlorophyll
B. ATP
C. lignin
D. cellulose
E. organic material
Answer: C
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During the germinal period, the fertilized ovum duplicates and forms a blastocyst. This hollow ball of cells
a. fills the amnion with fluid b. develops a tail for movement c. contains the embryonic disk d. shrinks in size and is absorbed by the blood
The site at which a virus has infected and subsequently lysed the infected cell, releasing its progeny to infect and lyse surrounding cells, thereby forming a "clear zone," is
A. a burst area. B. a lyse area. C. a plaque. D. a dead zone.
The organelle responsible for harvesting light as an energy source for photosynthesis is the
A. kinetoplast. B. mitochondrion. C. centriole. D. chloroplast.
Which of the following is true of AIDS?
a. It is equivalent to HIV. b. It is highly contagious. c. There is no cure for those afflicted. d. It is caused by a bacterium. e. It can be prevented by vaccination