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Water, pH and Macromolecules

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

Protein
Strong base
Phospholipid
DNA

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Water, pH and Macromolecules
The elements oxygen, nitrogen, and carbon

contain protons and neutrons in their atomic nuclei
are common elements in the molecules that make up living organisms
All of these
can all form covalent bonds with other elements

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Water, pH and Macromolecules
Molecules in which the atoms are held together by __________ bonds have the strongest chemical linkages.

noncovalent
hydrogen
ionic
covalent

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Water, pH and Macromolecules
Weak acids generally have pKa

been seldom found in living systems
pKa values greater than 2
values less than 1
that cannot be used to buffer

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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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Water, pH and Macromolecules
Polyprotic acids such as H3PO4, can act as acid-base buffers

at pH values around any of their pKa's
if their concentration is kept low
at pH values around neutrality
only in combination with polyprotic bases

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