Which of the following is true of amino acids dissolved in water?
A) They exist in un-ionized form at high pH.
B) They exist in un-ionized form at low pH.
C) They exist at un-ionized form only at the isoelectric point.
D) They do not exist in unionized form at any pH.
D
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In most organisms, ________ is the most plentiful substance making up their mass
A) nitrogen B) water C) carbon dioxide D) oxygen E) solid material
Which of the following processes explains why our skin feels colder immediately after stepping out of a hot tub?
A. latent heat of condensation B. latent heat of fusion C. latent heat of evaporation D. latent heat of sublimation
What type of feedback maintains stability in a system; i.e., what type of feedback keeps a system functioning properly by discouraging change?
A) tipping point B) neutral C) threshold D) positive E) negative
A(n) ________ is a mix of gas and dust emitted by a volcano that is so dense that it hugs the ground.
A. lava flow B. obsidian C. pyroclastic flow D. tuff flow E. pahoehoe flow