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5 Written questions

5 Matching questions

  1. Describe how and why hydrogen bonds form in water.
  2. Why is water in the solid phase less dense? How does this support life?
  3. Does form impact function?
  4. Draw functional group structure and give molecular formula for: Phosphate.
    Example?
  5. Why is carbon the basic building element of life?
  1. a Hydrogen bonds keep the molecules spread out, so they don't pack together, making them less dense.
    The floating ice insulates the body of water underneath it; if ice sank, then all the bodies of water would freeze solid, making life unlivable.
  2. b Hydrogen bonds are the bonds between two polar molecules - one with a partial positive charge and one with a partial negative charge; water is perfect for this because it has the partial negative of Oxygen and the partial positive of Hydrogen.
  3. c YES!
  4. d Because it can bond to 4 other atoms (tetravalent - 4 valence electrons)
  5. e Phosphate (−OPO₃²⁻) (acid: DNA, cell membrane, ATP); P double to O, single to O, 2 O⁻

    O

    −O−P−O⁻
    |
    O⁻

    Ex: glycerol phosphate

5 Multiple choice questions

  1. Yes. Ex: tiny tag from a functional group determines whether we are males or females
  2. WATER!
  3. 4 and 4
  4. Special abilities water takes on when combined with itself (only works with large amounts of molecules, not just a single molecule)
  5. A log scale. Each change is 10 times. So when we go up or down, we add a zero to the end.

5 True/False questions

  1. What is specific heat?pH is the measurement used to quantify the H⁺ ion concentration in an aqueous (water) solution

          

  2. What two properties of water do plants take advantage of, to move water against gravity, explain?Yes. Ex: tiny tag from a functional group determines whether we are males or females

          

  3. Draw functional group structure and give molecular formula for: Sulfhydryl.
    Example?
    Sulfhydryl (−SH or HS−) (protein cross-linking, stabilizes structure)
    −SH
    Ex: Covalent bonding w/ other sulfhydryls (disulfide bridge)

          

  4. What are the different types of isomers (changes) and how are they different?Hydrophilic - attracted to water; polar or ionic; has charge
    Hydrophobic - repels water; nonpolar; no charge

          

  5. Be able to recreate hydrogen bonding in water.
    (see p. 1 slide 4 in ch. 3)

          

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