The first step in sewage treatment is ________.

A. filtration
B. aeration and settling
C. sedimentation
D. chlorination


Answer: C

Biology & Microbiology

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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.

Biology & Microbiology

What form does sulfur take in soil?

a. H2S b. SO2 c. SO4- d. H2SO4

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology