The first step in sewage treatment is ________.
A. filtration
B. aeration and settling
C. sedimentation
D. chlorination
Answer: C
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The appropriate folding of a newly translated protein is essential, and chronic misfolding often leads to disease, especially in vertebrates. This misfolding, particularly in the case of prion diseases, may be due to a defect in
A) the enzyme foldase. B) insertion of proper amino acids during translation. C) proteosome function. D) chaperone activity. E) translocase.
What form does sulfur take in soil?
a. H2S b. SO2 c. SO4- d. H2SO4
Examples of isotopes include:a
oxygen 8 and oxygen 16. b. carbon 12 and nitrogen 14. c. hydrogen 1 and helium 1. d. sodium 23 and potassium 23. e. carbon 12 and carbon 14.
During the course of evolution, one of the main threats to human survival was ____________. Persons who stood the best chance of survival were those __________.
(a) extreme cold; who were heavier and had a protective layer of body fat (b) the presence of vegetation that was toxic if eaten; who ate only meat (c) inconsistent food supplies; who preferred high-calorie foods (d) animal predators; who were lean and could ambulate quickly