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Water, pH and Macromolecules

Water, pH and Macromolecules
H2O and CH4 are both examples of

ions
molecules
acids
none of these

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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?

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

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

All of these
Guanidinium ion
Indole
Imidazole

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

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

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Water, pH and Macromolecules
The dissociation constant of H2O at 25° C is

10-7 M
1014 M
10-14 M
107 M

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Water, pH and Macromolecules
If protein is made exclusively from nonpolar amino acids, then it will this protein interact with water?

It will act as a buffer and stabilize the pH
be repelled by water
It will be attracted to water
It will form a membrane in water

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