water-ph-and-macromolecules biochemistry question and answers -Page 3

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Water, pH and Macromolecules problems

1. Polyprotic acids such as H₃PO₄, can act as acid-base buffers
Options
A. only in combination with polyprotic bases
B. if their concentration is kept low
C. at pH values around neutrality
D. at pH values around any of their pK_a's

2. The reactions of molecules
Options
A. are the reactions of the functional groups
B. are independent of the functional groups
C. require an enzyme in all cases
D. all of the above

3. Which of the following character does not apply to water?
Options
A. The water molecule is asymmetric
B. The water molecule readily forms hydrophobic interactions
C. The covalent bonds in water are highly polarized
D. All three atoms in the water molecule readily form hydrogen bonds

5. The effectiveness or capacity of a buffer solution can be affected by
Options
A. molar concentration of the buffer components
B. concentration of the conjugate base to the weak acid
C. both (a) and (b)
D. temperature of buffer components

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

9. The elements oxygen, nitrogen, and carbon
Options
A. can all form covalent bonds with other elements
B. contain protons and neutrons in their atomic nuclei
C. are common elements in the molecules that make up living organisms
D. All of the above

10. The main difference between an acid and a base is that
Options
A. bases are polar molecules and acids are not
B. acids are polar molecules and bases are not
C. bases donate hydrogen ions in water while acids accept hydrogen ions
D. acids donate hydrogen ions in water while bases accept hydrogen ions

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