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5 Written Questions

5 Matching Questions

  1. Organic molecules must always contain what?
  2. What are primary producers?
  3. Do the functional groups have an impact on life? Give an example.
  4. Why is carbon the basic building element of life?
  5. What are the differences between a hydrophilic and hydrophobic substance?
  1. a Fix C from atmospheric CO₂ (ex: Plants w/ photosynthesis)
  2. b Yes. Ex: tiny tag from a functional group determines whether we are males or females
  3. c Hydrophilic - attracted to water; polar or ionic; has charge
    Hydrophobic - repels water; nonpolar; no charge
  4. d Carbon and Hydrogen
  5. e Because it can bond to 4 other atoms (tetravalent - 4 valence electrons)

5 Multiple Choice Questions

  1. H⁺ = 10⁻⁷ and OH⁻ = 10⁻⁷ Equation: [H⁺][ OH⁻] = 10⁻¹⁴ (always = to 14)
  2. 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
  3. Acids raise the concentration of H⁺ ions in an aqueous solution (decreases the pH number)
    Bases lower the concentration of H⁺ ions (increases the pH number)
  4. Methyl (−CH₃) (sex hormones, DNA methylation (when it gets tagged onto your DNA); C single bonded to 3 H's

    H
    |
    −C − H
    |
    H

    Ex: 5-methyl cytidine
  5. 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.

5 True/False Questions

  1. Be able to calculate the molar concentrations of hydrogen and hydroxide ions from a given pH value or vice versa.Ex: pH = 12, What is the molar concentration of H⁺? OH⁻? H⁺ is 1 x 10⁻¹², OH⁻ is 1 x 10⁻².

          

  2. 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

          

  3. Does form impact function?Buffers are molecules that resist change in pH; they either release H⁺ to lower the pH or take up H⁺ to raise the pH

          

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

          

  5. Describe the terms: solvent, solute, and solution.Solvent: Substance doing the dissolving (water)
    Solute: Substance being dissolved (sugar or salt)
    Solution: homogenous mixture (product of solvent & solute)

          

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