How can the carbon skeletons of amino acids enter the common catabolic pathway?
A) as part of amino acids
B) as part of complete proteins
C) as acetyl coenzyme A
D) as any of these
C
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The membrane-filtration method of desalination
A. works best on water with low concentrations of dissolved impurities. B. is prohibitively expensive; it would increase the cost of water beyond the reach of most homeowners. C. is efficient but extremely slow compared to other methods. D. All of the choices are correct.
Which of the following elements is the most stable from a nuclear point of view?
A) iron B) hydrogen C) argon D) uranium E) All are equally stable.
Soil that is reddish, intensely leached, and rich in iron and aluminum minerals most likely forms in
A. an area with only minor soil development. B. arid climate. C. tropical climate. D. temperate climate. E. a short amount of time.
Gasoline, diesel fuel, jet fuel, and motor oil are examples of _____________.
Fill in the blank(s) with the appropriate word(s).