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    Energy acquisition

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    This job answers these questions:

    1. Two possible end products of fermentation are ____________ as is produced by our muscle cell under anaerobic conditions and ____________ by yeast under
    anaerobic conditions.

    2. If C4 photosynthesis prevents photorespiration, why haven't all plants evolved to use the C4 pathway?
    a. All plants will evolve to be C4 in time
    b. C4 produces some toxic byproducts
    c. C4 is not advantageous in all climates
    d. Only some plants use C4 photosynthesis
    e. C4 is only advantageous in high oxygen habitats.

    3. Photorespiration is bad for a plant because
    a. O2 is required
    b. CO2 is synthesized
    c. RuBP is degraded
    d. glucose is synthesized
    e. no ATP is produced

    4. All of the following statements pertaining to catalysts are true except:
    a. biological catalysts are specific enzymes
    b. catalysts increase activation energy requirements
    c. catalysts increase reaction rate
    d. catalysts are not permanently altered during reaction
    e. all are true

    5. Photosynthesis is classed as a coupled reaction because
    a. it is exergonic and does not require an initial input of energy to proceed
    b. there is not net change in chemical equilibria between the reactants and products
    c. high-energy reactants are converted into low-energy products
    d. it requires the energy of endergonic reactions to proceed
    e. it produces a high energy product

    6. Give the formula for photosynthesis. For each reactant, indicate where the plant acquires it. For each product, not during what part of photosynthesis it is produced.

    7. What is simple definition of energy from the biological perspective? Give at least two examples of where energy is used in a cell.

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    Solution Preview


    Energy acquisition is essential for life and is the theme of your assignment questions. How do organisms harness and use energy? Well, it depends on the organism of interest. Question 1. relates to anaerobic energy in a) mammalian cells and b) yeast cells. part a) is lactic acid, a three carbon molecule produced by muscles when worked without oxygen delivery to tissues. b) is alcohol (ethanol), produced (often purposely ie. in making beer and wine) by yeast cells under anaerobic conditions. this process lacks a functional electron transport chain, uses only the glycolysis portion of energy production, produces 2 ATP and uses 2 NAD - 2 NADH to reduce pyruvate to either of the above products. http://www.emc.maricopa.edu/faculty/farabee/BIOBK/BioBookGlyc.html - look at this if you can to see some simple diagrams and explanations of the processes of fermentation.

    2) the answer here is c, this form of photosynthesis is adapted for use in hot, dry climates. I saw a good explanation of this on the web by Dave Williams, Science department chair, Valencia Community College: The problem with C3 ...

    Solution Summary

    Energy acquisition is featured.