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    Self Assessment 2b Part 2

    Uploaded by

    Darlene Krizian
    1. Autotrophs can produce their own food through photosynthesis, like plants and algae, while heterotrophs obtain food from other organisms, like animals and fungi. 2. Light reactions occur in the thylakoid and convert light energy to ATP and NADPH. Dark reactions then use these products in the stroma to convert carbon dioxide into glucose. 3. Photosynthesis is important because it produces oxygen for animals and humans to breathe, uses carbon dioxide to reduce air pollution, and without it many oxygen-dependent organisms could not survive.

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    Self Assessment 2b Part 2

    Uploaded by

    Darlene Krizian
    20 views2 pages
    1. Autotrophs can produce their own food through photosynthesis, like plants and algae, while heterotrophs obtain food from other organisms, like animals and fungi. 2. Light reactions occur in the thylakoid and convert light energy to ATP and NADPH. Dark reactions then use these products in the stroma to convert carbon dioxide into glucose. 3. Photosynthesis is important because it produces oxygen for animals and humans to breathe, uses carbon dioxide to reduce air pollution, and without it many oxygen-dependent organisms could not survive.

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    1. Autotrophs can produce their own food through photosynthesis, like plants and algae, while heterotrophs obtain food from other organisms, like animals and fungi. 2. Light reactions occur in the thylakoid and convert light energy to ATP and NADPH. Dark reactions then use these products in the stroma to convert carbon dioxide into glucose. 3. Photosynthesis is important because it produces oxygen for animals and humans to breathe, uses carbon dioxide to reduce air pollution, and without it many oxygen-dependent organisms could not survive.

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    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    20 views2 pages

    Self Assessment 2b Part 2

    Uploaded by

    Darlene Krizian
    1. Autotrophs can produce their own food through photosynthesis, like plants and algae, while heterotrophs obtain food from other organisms, like animals and fungi. 2. Light reactions occur in the thylakoid and convert light energy to ATP and NADPH. Dark reactions then use these products in the stroma to convert carbon dioxide into glucose. 3. Photosynthesis is important because it produces oxygen for animals and humans to breathe, uses carbon dioxide to reduce air pollution, and without it many oxygen-dependent organisms could not survive.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
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    Module/ Unit 2B Part 2 Activity

    Name: Darlene Krizian G. Dayuha Section: A8A56

    1. Differentiate autotrophs from heterotrophs.


    Autotrophs are capable of producing their food through photosynthesis. Plants and
    algae are typical examples of autotrophic organisms. Heterotrophs are organisms that
    obtain their food from other organisms that are either autotrophs or heterotrophs. For
    example, animals, fungi and several unicellular organisms are heterotrophs.

    2. Compare and contrast light reactions and dark reactions.


    Light reactions and dark reactions are the two stages of photosynthesis. Light reactions
    happen in the thylakoids in the chloroplast. This reaction requires light energy and
    converts this into ATP and NADPH needed in the dark reactions. Dark reactions still also
    occur in the chloroplast, but specifically in the stroma. The ATP and NADPH produced
    from the previous reaction are then used for carbon dioxide to undergo series of
    conversions to produce glucose.

    3. Give the importance of photosynthesis.


    Organisms like humans must be aware of how vital photosynthesis is. This process is
    primarily the source of oxygen, which animals and humans need to breathe. It also
    makes us of carbon dioxide littering the atmosphere, helping reduce air pollution.
    Without this process, I doubt that organisms that require oxygen daily could even
    survive.

    4. What color of light is least effective in driving photosynthesis? Explain.


    The green color is the least effective because it is poorly absorbed by photosynthetic
    pigments, like chlorophyll. Chlorophyll pigments are likely to absorb red and blue.
    However, this does not go to show that the green light is useless. Some “accessory”
    pigments have different spectra of absorption with chlorophyll, and they can absorb
    the green light.
    5. What is the overall purpose of light dependent reactions?
    All in all, light-dependent reactions absorb photons from sunlight to convert them into
    ATP and NADPH that can be used in the next stage, which is the Light Independent
    reactions. Water is also split in the light-dependent responses, resulting in the release of
    oxygen gas to the atmosphere.

    6. What will happen if the third stage of the Calvin cycle does not occur?
    The next generation of the Calvin cycle will also not occur because of the absence of
    the Carbon compound, which is supposedly generated from the Glycerate
    phosphate in the third stage. Therefore, there would also be no production of glucose.

    7. Two molecules of what compound are produced by glycolysis? Does this molecule enter the citric
    acid cycle?
    Glycolysis produces two molecules of pyruvate or pyruvic acid. Before this compound
    enters the Citric acid cycle, it shall initially be split apart. Each pyruvate molecule loses
    carbon, turning the pyruvate into acetic acid, which then attaches to an enzyme called
    coenzyme A or CoA. Therefore, yes, this molecule enters the citric acid cycle but already
    with a different chemical composition.

    8. What is oxidative phosphorylation?


    Oxidative phosphorylation is the final stage in cellular respiration. This process involves
    the transfer of electrons from NADH or FADH2 to oxygen through a chain of electron
    transporters. The energy being released resulting in the production of ATP.

    9. Give the function of ATP synthase.


    ATP synthase is an integral membrane protein that functions to synthesize ATP out of
    its precursor, adenosine diphosphate ADP and an inorganic phosphate. This occurs
    during the oxidative phosphorylation in cellular respiration.

    10. What is the significance of cellular respiration?


    Cellular respiration is a vital process because it produces biochemical energy, usually
    in the form of ATP which are important in upholding different function of the body
    systems of an organism.

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