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Bio200 POGIL Cell Biology Activity 1 – Biological Molecules Schivell STUDENT KEY NOTE: Only some of the answers have been posted! This is to make sure you do the work yourself. You can check with other students or your TA for confirmation. 4. Yes – CO2 is a good example – the symmetry of the partial negative charges renders the overall molecule nonpolar. 5. Polar Nonpolar Polar 6. Methanol and water 7. Ethane 8. Ethane 9. Methanol 10. In general, nonpolar molecules are hydrophobic. 11. Hydrophilic Hydrophilic Hydrophilic Hydrophobic 14. The hydrogen has a partial positive charge which is attracted to the partial negative charge of the oxygen. 17. 1 Bio200 POGIL Cell Biology Activity 1 – Biological Molecules 18. Only some of the possible H-bonds are shown in A and C. A: Protein structure B: DNA base pairing C: Plant cell wall (cellulose) Oxygen (dark gray) Carbon (light gray) Hydrogen (white) 2 Schivell