The degree or extent of disease that a pathogen causes is
A) a host factor.
B) virulence.
C) attenuation.
D) pathogenicity.
E) toxicity.
Answer: B
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Which process produces a gaseous product that can be used as fuel to provide heat or power for a wastewater treatment plant?
A) trickling filter secondary wastewater treatment B) aerobic secondary wastewater treatment C) anaerobic secondary wastewater treatment D) primary wastewater treatment
Whole-cell movements involve the coordinated activity of ____
a. microtubules only b. microfilaments only c. blastomeres only d. microtubules and microfilaments e. microtubules, microfilaments and blastomeres
The outward-facing cell walls of epidermal cells contain which substance to reduce water loss?
a. wax b. pectin c. lignin d. suberin e. chitin
A population ecologist wants to estimate the
size of a robin population. In an apple orchard, she captures 10 robins, marks them, and then releases them. She returns several weeks later and captures another 10 robins of which 2 are robins she previously marked. The estimated population size of robins is
a. 50 b. 15 c. 10 d. 200 e. 20