Viruses that kill bacterial host cells during each cycle of infection are called ____
a. virulent bacteriophages
b. enveloped viruses
c. temperate bacteriophages
d. phages
e. nonvirulent bacteriophages
ANSWER: a
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All EXCEPT which of the following is true of the
spinal cord? a. houses connections between sensory and motor neurons b. serves as a reflex center c. its gray matter serves as passageway for nerve tracts to brain d. is covered with meninges e. is enclosed by vertebrae
Which of the following is NOT true concerning sensory neurons?
a. They collect information about stimuli. b. They lie in the pathway between the interneurons and motor neurons. c. They relay information to the spinal cord. d. They relay information to the brain. e. They are one of three types of neurons.
Which trophic level would contain the lowest quantity of energy (kcal per m2)?
a. secondary consumers b. tertiary consumers c. herbivores d. producers e. primary consumers
Coastal wetlands, or marshes, serve to
A) purify water farther upriver. B) return nitrogen to the atmosphere. C) store phosphorus. D) provide a habitat for major predators. E) "absorb" water from major storms.