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Water, pH and Macromolecules

Water, pH and Macromolecules
Which of the following organic groups are found in naturally occuring amino acids?

Guanidinium ion
All of these
Indole
Imidazole

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

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

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Water, pH and Macromolecules
The reactions of molecules

All of these
are independent of the functional groups
are the reactions of the functional groups
require an enzyme in all cases

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Water, pH and Macromolecules
The effectiveness or capacity of a buffer solution can be affected by

concentration of the conjugate base to the weak acid
temperature of buffer components
molar concentration of the buffer components
both (a) and (b)

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

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Water, pH and Macromolecules
A Bronsted acid becomes __________ upon losing a proton.

its conjugate acid
a hydronium ion
its conjugate base
highly reactive

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