The ultimate source of energy trapped during photosynthesis is
(a) CO2.
(b) H2O.
(c) O2.
(d) sunlight.
(d) sunlight.
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Some amoebae have a covering over their plasma membrane. These amoebae are referred to as ________ amoebae.
Fill in the blank(s) with the appropriate word(s).
A microbiologist is conducting a research project on chemolithoautotrophs. This means that the investigator is examining certain aspects of a bacterium that
A. can oxidize inorganic molecules such as ammonia and sulfur for energy B. is a purple non-sulfur bacteria which depends on light. C. obtains carbon from organic molecules. D. can use the energy from sunlight to build organic molecules from carbon dioxide. E. uses light as its energy source and carbon for organic compounds.
Cardiac muscle cells
a. do not contract by a sliding filament mechanism. b. are similar to those of smooth muscle in being nonstriated. c. have fewer mitochondria than skeletal muscle cells do. d. possess numerous gap junctions on their sides, favoring rapid spread of excitation. e. have intercalated disks with tight junctions at their branching ends
Aposematic, or warning coloration, serves to protect an animal or plant by signaling to potential ________ to stay away.
A. competitors B. predators C. mates D. rivals