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5 Written questions

5 Matching questions

  1. Draw functional group structure and give molecular formula for: Phosphate.
    Example?
  2. Draw functional group structure and give molecular formula for: Amino.
    Example?
  3. How many valence electrons does carbon have? How many single covalent bonds can it form?
  4. Draw functional group structure and give molecular formula for: Carboxyl.
    Example?
  5. What are the molar concentrations of hydrogen and hydroxide ions in one liter of pure water?
  1. a 4 and 4
  2. b Phosphate (−OPO₃²⁻) (acid: DNA, cell membrane, ATP); P double to O, single to O, 2 O⁻

    O

    −O−P−O⁻
    |
    O⁻

    Ex: glycerol phosphate
  3. c Amino (-NH₂) (acts as a base, amino acids); N single bonded to 2 H's

    H
    |
    −N
    |
    H

    Ex: Glycine
  4. d Carboxyl (-COOH) acidic properties, components of many biologically important molecules; C double bonded to O and single to OH

    O

    −C
    |
    OH

    Ex: Formic acid or acetic acid
  5. e H⁺ = 10⁻⁷ and OH⁻ = 10⁻⁷ Equation: [H⁺][ OH⁻] = 10⁻¹⁴ (always = to 14)

5 Multiple choice questions

  1. Sulfhydryl (−SH or HS−) (protein cross-linking, stabilizes structure)
    −SH
    Ex: Covalent bonding w/ other sulfhydryls (disulfide bridge)
  2. 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.
  3. Resistance to change in temperature
  4. Organic molecules composed solely of Carbon and Hydrogen; Nonpolar covalent bond so they resist/repel water (ex: fat)
  5. Hydroxyl (polar, form hydrogen bonds, polar solvents)
    −OH (may be written HO-)
    Ex: Alcohols, such as Ethanol

5 True/False questions

  1. What is the pH scale?Resistance to change in temperature

          

  2. Do the functional groups have an impact on life? Give an example.Hydroxyl, Carbonyl, Carboxyl, Amino, Sulfhydryl, Phosphate, and Methyl

          

  3. Draw functional group structure and give molecular formula for: Carbonyl.
    Example?
    Carboxyl (-COOH) acidic properties, components of many biologically important molecules; C double bonded to O and single to OH

    O

    −C
    |
    OH

    Ex: Formic acid or acetic acid

          

  4. What is the Universal Solvent?pH is the measurement used to quantify the H⁺ ion concentration in an aqueous (water) solution

          

  5. What are emergent properties of water?Small organic molecules with great effects:
    Hydroxyl, Carbonyl, Carboxyl, Amino, Sulfhydryl, Phosphate, and Methyl