What determines if a soft-bottom area is composed of sand or mud?
a. Types of animals
b. Current strength
c. Turbidity
d. Wave action
b
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Which of the following prokaryotic nutritional
groups use CO2 and sunlight to produce energy? a. photoautotrophs b. chemoautotrophs c. photoheterotrophs d. chemoheterotrophs e. all of these
Negatively charged subatomic particles that have almost no mass are called:
A. protons. B. ions. C. electrons. D. polymers. E. neutrons.
What is the function of surfactant?
A) It increases alveolar expansion. B) It increases surface tension. C) It stimulates activity of the cilia lining the walls of the alveoli. D) It enhances contraction of the inspiratory muscles. E) It prevents the alveoli from sticking together and collapsing.
Which of the following statements about biological transmission is FALSE?
A) The pathogen reproduces in the vector. B) The pathogen may enter the host in the vector's feces. C) Houseflies are an important vector. D) The pathogen may be injected by the bite of the vector. E) The pathogen may require the vector as a host.