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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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
In most organisms, ________ is the most plentiful substance making up their mass
A) nitrogen B) water C) carbon dioxide D) oxygen E) solid material