What category(s) of organic macromolecule allow(s) myelinated sheaths to act as electrical insulators?
a. proteins
b. carbohydrates
c. lipids
d. nucleic acids
e. proteins and nucleic acids
C
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You are presented with an organism that has not been identified previously. Which feature would identify it as a fungus?
A. flagella B. cell wall C. nonparasitic D. absorptive nutrition E. mycelia
When might unrelated individuals engage in apparently altruistic acts?
A. If they are trying to mate with each other. B. If they are unselfish individuals. C. If the altruism is likely to be reciprocated. D. If the act benefits their population. E. Unrelated individuals never perform apparently altruistic acts.
What limits the frequency of action potentials?
A. chloride ions B. spike amplitude C. nodes of Ranvier D. refractory period
During the Gram stain, the application of alcohol results in the decolorization of ______ cells.
A. gram-negative B. pleomorphic C. all D. gram-positive