1. A substrate molecule may be bound to the active site of an enzyme by all of the following EXCEPT A. Hydrogen Bonds B. Peptide Bonds C. Ionic Bonds D. Van der Waals Interactions E. Hydrophobic Interactions 2. Which of the following components is the most important in determining the 3-D structure of Hemoglobin? A. Quaternary Structure B. Tertiary Structure C. Secondary Structure D. Primary Structure E. Number of Disulfide Bonds For question 1, I'm between Peptide (B) and Van der Waals Interactions (D). For 2, I'm between Quaternary (A) and Primary (D).