Water, pH and Macromolecules – Section 1

26. Which of the following character does not apply to water?

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

27. The dissociation constant of H₂O at 25° C is

A. 10-¹⁴M
B. 10¹⁴M
C. 10-⁷M
D. 10⁷M

28. Weak acids generally have pK_a

A. values less than 1
B. pK_a values greater than 2
C. been seldom found in living systems
D. that cannot be used to buffer

29. The reason that fats contain more energy than simple sugars, is fats have many more

A. carbon atoms
B. hydrogen atoms
C. covalent bonds
D. hydrogen bonds

30. The main difference between an acid and a base is that

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