Unit-IV Intrection of Molecules in 3-D Space Determining Binding Dissociation ConstantBy abdulslambsn@gmail.com / June 14, 2025 Quiz 4 | Unit-IV Intrection of Molecules in 3-D Space Determining Binding Dissociation Constant Your Good Name: Your College Name: Morning/Evening/Private: Email: 1. What type of interaction occurs between two different molecules? Covalent Intermolecular Intramolecular Nuclear None 2. Hydrogen bonding is an example of: Intramolecular bonding Covalent bonding Intermolecular interaction Ionic bonding None 3. Which force is primarily responsible for the binding of a ligand to a receptor? Gravitational van der Waals Intermolecular forces Covalent bonding None 4. Dissociation constant (Kd) is a measure of: Affinity between two molecules Enzyme activity Protein folding Ionic strength None 5. Which statement best describes the binding constant (Ka)? It tells how unstable a complex is It equals 1/Kd It is always less than 1 It describes the solubility of gases None 6. Which of the following does NOT involve intermolecular forces? Protein-ligand binding Base pairing in DNA Folding of protein secondary structures Antibody-antigen interaction None 7. Which of the following is a weak non-covalent interaction? Ionic bond Hydrogen bond Peptide bond Disulfide bond None 8. An increase in dissociation constant (Kd) implies: Higher binding affinity No change in interaction strength Lower binding affinity Stronger covalent bond None 9. Intramolecular interactions occur: Within the same molecule Between two separate molecules Between solvent and solute Inside a solvent None 10. Which of the following contributes to molecular recognition? Shape complementarity Charge interactions Hydrogen bonding All of the above None 11. In receptor-ligand interaction, the lower the Kd: The faster the binding The weaker the interaction The stronger the affinity The higher the solubility None 12. van der Waals interactions are: Strong covalent bonds Electrostatic attractions Weak interactions due to induced dipoles Hydrogen bonds None 13. Which interaction stabilizes the tertiary structure of a protein? Intramolecular interactions Intermolecular interactions DNA-DNA pairing Ligand-receptor binding None 14. Enzymatic reaction Enzymatic reaction Intermolecular interaction Intramolecular bonding Protein hydrolysis None 15. Which factor does NOT affect molecular binding affinity? Molecular shape Temperature Solvent polarity Atomic mass None 16. What determines the specificity of molecular binding? Random diffusion Concentration only Complementary shape and charge Temperature only None 17. Which of the following techniques is used to determine binding constants? Gel electrophoresis UV spectroscopy Surface Plasmon Resonance ELISA None 18. Why are intermolecular forces important in drug design? They affect color of the drug They stabilize the tablet form They determine binding specificity and strength They improve water solubility only None 19. A low Kd value indicates: Weak and temporary binding Strong and stable binding No binding occurs Unfavorable interaction None 20. In a dynamic equilibrium of binding, what happens at Kd? Half of receptors are occupied Binding stops Maximum binding occurs No ligand is present None 21. Which of the following best explains how temperature affects Kd? Kd always increases Higher temperature disrupts non-covalent interactions, increasing Kd Kd is unaffected Lower temperature strengthens covalent bonds None 22. Which is stronger: van der Waals < Hydrogen bond < Ionic bond Hydrogen bond < Ionic bond < van der Waals Ionic bond < van der Waals < Hydrogen bond Ionic bond = Hydrogen bond = van der Waals None 23. Which interaction is essential in antigen-antibody recognition? van der Waals only Disulfide bond Multiple weak intermolecular forces Intramolecular folding None 24. Why is intramolecular interaction significant in protein folding? Helps attract other molecules Determines solubility Stabilizes specific 3D conformations Disrupts bonding None 25. The strength of molecular binding is influenced by: Only pH Only temperature Environment, charge, polarity, and shape None of the above None 1 out of 3 Thanks For Submitting Your Quiz !!