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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?

Phospholipid
DNA
Strong base
Protein

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

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Water, pH and Macromolecules
The reactions of molecules

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

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

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

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

its conjugate acid
highly reactive
its conjugate base
a hydronium ion

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

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

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