Lab 20: Energy and Photosynthesis-14 questions

    Experiment 1: Paper
    ChromatographyData Tables and Post-Lab AssessmentTable 1: Part 1:
    Chromatography Data

    Solvent

    Distance from
    Original Line to Solvent Front

    Number of Bands

    Rf
    Factor

    Acetic Acid

    Acetone

    Mineral Oil

    Water

    Table 2: Part 3:
    Photosynthesis Data

    Test Tube

    Time Required to
    Change Color

    Initial Color

    Final Color

    Time Required to
    Change Color (Hours)

    1

    2

    3

    Post-Lab Questions1. What did the different colored bands signify in each
    solvent for Part 1? What pigments can you associate them with?2. What is the osmolarity fluid used in Part 2? Why is this
    important? Why is it essential to keep it cool?3. How could you modify this experiment to show the effects of
    different wavelengths of light on the photosynthetic rate?4. Some plants (grasses) tend to contain a greater
    concentration of chlorophyll than others (pines). Can you develop a hypothesis
    to explain this? Would it be testable?5. Saliva
    does not contain amylase until babies are two months old. How could this affect
    an infant’s digestive requirements?
    Answer the following 5 questions in depth:

    1. What was the main theme of this
    experiment?
    2. To what degree were the objectives
    outlined in the introduction to this experiment met?
    3. What conclusions were drawn from the
    results?
    4. What was the clearest and also the most
    difficult aspects of this experiment?
    5. How would you improve this experiment?Lab 20: Energy and
    Photosynthesis
    Pre-Lab Questions
    1. Describe how the functional units for beta carotene,
    xanthophyll, chlorophyll A, and chlorophyll B are different. Be sure to
    identify the subunits that adhere to paper during chromatography.

    2. Describe a technique for measuring photosynthetic rate.

    3. Many deciduous trees have leaves which turn yellow in the
    fall. What do you suppose is happening in the leaves at the cellular and molecular
    level?

    4. Chloroplasts and mitochondria are both are unusual in that
    they have double membranes and contain their own set of DNA. Can you think of
    any explanations for this observation?

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