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Water, pH and Macromolecules

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
7 x 10-7
1 x 10-7

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

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Water, pH and Macromolecules
The reactions of molecules

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

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Water, pH and Macromolecules
A compound that is capable of forming hydrogen bonds with water

is probably held together by noncovalent bonds
contains at least some polar covalent bonds
does not dissolve well in water
should act as a good buffer for acids and bases

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Water, pH and Macromolecules
A biological polymer contains alanine, tyrosine, and lysine. Which of the following will be true about this molecule?

DNA
Phospholipid
Protein
Strong base

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

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