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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?

Indole
All of these
Guanidinium ion
Imidazole

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

its conjugate base
a hydronium ion
highly reactive
its conjugate acid

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

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

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

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Water, pH and Macromolecules
Which of the following indicates that the pK of an acid is numerically equal to the pH of the solution when the molar concentration of the acid and its conjugate base are equal?

Henderson-Hasselbalch equation
Hardy-Windberg law
Haldanes equation
Michaelis-Menten equation

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