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Water, pH and Macromolecules

Water, pH and Macromolecules
The strength of an acid depends on

number of double bonds
number of protons released
electronegativity
number of neutrons gain

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Water, pH and Macromolecules
Most of the important functional groups in biological molecules contain

nitrogen and a phosphate
oxygen and a phosphate
oxygen and/or nitrogen and are polar
oxygen and/or nitrogen and are acidic

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Water, pH and Macromolecules
Which of the following acid/base pairs act as natural buffers in living systems?

H2CO3/HCO3-
All of these
H2PO4-/HPO42-
Histidine+/histidine

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Water, pH and Macromolecules
A solution with pH = 5 is __________ than a solution with pH = 7.

10 times more basic
100 times more acidic
10 times more acidic
2 times more basic

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Water, pH and Macromolecules
The reason that fats contain more energy than simple sugars, is fats have many more

carbon atoms
hydrogen atoms
covalent bonds
hydrogen bonds

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Water, pH and Macromolecules
What is the concentration, in moles/liter, of the hydrogen ion, if pH of a solution is 7?

7
1 x 10-7
5 x 10-7
7 x 10-7

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