CellBio_Rev1.docx - Ngan Lam PCB 3023 Cell Biology Week 1...

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Ngan Lam PCB 3023: Cell Biology Week 1: Assignment 1. (a) In regards to hydrogen ions (protons) what is the difference between an acidic or basic molecule and an acidic or basic solution? Acids: Increase level of H+ (Hydrogen ions; protons) Bases: Decrease level of H+ (Hydrogen ions; protons), direct by acquiring H+ and indirect by release of OH- (b) Can a basic molecule become an acidic molecule and can an acidic molecule become a basic molecule? If so, how does this occur and is there any special terminology? -Yes - Acid Base Reactions yield a “salt” and water 2. Water is the most abundant molecule within cells. Describe the molecular properties of its structure as it is important for predicting its interaction with other molecules within the cell. -Highly asymmetric -Highly polarized covalent bonds -The oxygen is adept at forming hydrogen bonds 3. (a) Define the terms hydrophobic and hydrophilic. Which of the two form hydrogen bonds with the surrounding water molecules? What does this mean in terms of solubility in water? Hydrophilic * - “ water loving” * - Molecules carrying +/- charges (partial or full) * - Forms hydrogen bonds Hydrophobic - “water fearing” -No hydrogen bonds (not soluble in water)
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4. List the two ways that elements can form molecules. How do they differ in the distribution of electrons between the atoms of the formed molecule?
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