The complex of proteins and DNA in a nondividing cell is called
A) chromatin.
B) a nucleolus.
C) a ribosome.
D) a lysosome.
Answer: A
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The primary disadvantage of an osmoregulator strategy is
A. pumping ions into or out of the body is energetically expensive. B. pumping ions into or out of the body is not a significant energetic expense usually. C. keeping relatively constant internal conditions deprives the central nervous system of critical information about the environment. D. pumping water into or out of the body is energetically expensive. E. physiological systems do not typically perform well under relatively constant conditions.
Reabsorption of water and essential solutes
occurs in the region labeled
a. 1. b. 2. c. 3. d. 4. e. as none of these.
The data of Huey and colleagues (1989 ) on thermoregulation in garter snakes is an example of the ________ method evolutionary biologists use to test hypotheses about adaptations
A) situational B) experimental C) observational D) phylogenetic contrast E) comparative
Peristalsis refers to waves of muscular contractions
____________________ Indicate whether the statement is true or false.