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21 Cards in this Set
- Front
- Back
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Enzymes |
Catalyze all chemical reactions |
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transport proteins |
move molecules |
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horomones |
cell to cell communication |
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recepetors |
transduce signals |
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structural proteins |
architecture of cells |
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The unusual properties of water are due mainly due to its capacity for |
Hydrogen bonding |
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Water has ____ potential H-bond acceptor site(s), and ____ potential H-bond donor site(s). |
2,2 |
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A high boiling point for a liquid is favored by ... |
High molar weight and high capacity for H bonding |
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Which of the following gases is most soluble in water?
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Ammonia |
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Fatty acids have a hydrophilic "head" attached to a hydrophobic "tail." As such we say that these molecules are
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Amphipathic |
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In the presence of a hydrocarbon chain, water molecules closest to the hydrocarbon become more ___________. In doing so they create a _____________.
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Structured; clathrate |
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Which of the following can best generate repulsion between adjacent molecules or parts of molecules?
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Electrostatic forces |
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Some proteins facilitate "proton hopping" across a biological membrane using a pathway of organized water molecules. A good example of this is ...
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Cytochrome f |
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The molarity of pure water is ...
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55.5 M |
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Pure water consists of |
H2O + H30+ + OH- |
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The concentration of hydronium ions in pure water is |
10^-7 M |
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The ion product of water is abbreviated ...
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Kw |
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pH is defined as ... |
-log [H+] |
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The pH of normal human blood serum is ...
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7.4 |
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Which equation most accurately describes acetic acid dissolved in water at equilibrium? |
Ka = [H+][Ac-] / [HAc] |
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When titrating an aqueous solution of acetic acid using sodium hydroxide, one finds that the amount of sodium hydroxide needed to increase the pH by 0.1 pH units ___________________ as the pH approaches the pKa of acetic acid.
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Increases |
