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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?

DNA
Phospholipid
Strong base
Protein

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Water, pH and Macromolecules
Weak acids generally have pKa

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

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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
both (a) and (b)
molar concentration of the buffer components

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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 elements oxygen, nitrogen, and carbon

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

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Water, pH and Macromolecules
The pH of a solution is determined by

dielectric constant of the medium
concentration of salt
relative concentration of acids and bases
environmental effect

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