Biochemistry - Water, pH and Macromolecules

Exercise :: Water, pH and Macromolecules - Section 1

  • Water, pH and Macromolecules - Section 1
11. 

What is the concentration, in moles/liter, of the hydrogen ion, if pH of a solution is 7?

A. 7
B. 7 x 10-7
C. 5 x 10-7
D. 1 x 10-7

Answer: Option D

Explanation:

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12. 

Which of the following alcohols would be most soluble in water?

A. methanol
B. ethanol
C. butanol
D. octanol

Answer: Option A

Explanation:

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13. 

Which of the following acid/base pairs act as natural buffers in living systems?

A. H2CO3/HCO3-
B. H2PO4-/HPO42-
C. Histidine+/histidine
D. All of these

Answer: Option D

Explanation:

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14. 

If protein is made exclusively from nonpolar amino acids, then it will this protein interact with water?

A. be repelled by water
B. It will be attracted to water
C. It will form a membrane in water
D. It will act as a buffer and stabilize the pH

Answer: Option A

Explanation:

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15. 

A compound that is capable of forming hydrogen bonds with water

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

Answer: Option B

Explanation:

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