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Water, pH and Macromolecules

Water, pH and Macromolecules
The reason that fats contain more energy than simple sugars, is fats have many more

hydrogen atoms
hydrogen bonds
carbon atoms
covalent bonds

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Water, pH and Macromolecules
Which of the following acid/base pairs act as natural buffers in living systems?

H2PO4-/HPO42-
Histidine+/histidine
All of these
H2CO3/HCO3-

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

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

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Water, pH and Macromolecules
The lone pair electrons on oxygen in a H20 molecule

carry a partial positive charge
are not important for the properties of water
form covalent bonds in ice
carry a partial negative charge

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

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

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

its conjugate base
highly reactive
a hydronium ion
its conjugate acid

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