16. A biological polymer contains alanine, tyrosine, and lysine. Which of the following will be true about this molecule?

A. DNA
B. Strong base
C. Phospholipid
D. Protein

17. The effectiveness or capacity of a buffer solution can be affected by

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

18. Who discovered and described the blood groups (ABO) classification?

A. Theodor Kocher
B. Karl Landsteiner
C. Otto Warburg
D. Karl Hooper

19. H₂O and CH₄ are both examples of

A. molecules
B. ions
C. acids
D. none of these

20. Hydrogen bonds and hydrophilic interactions are types of

A. weak chemical bonds that hold together the atoms within a molecule
B. strong chemical bonds that hold together the atoms within a molecule
C. weak chemical bonds that link together separate molecules
D. strong chemical bonds that link together separate molecules