Energy
Download
1 / 10

Energy - PowerPoint PPT Presentation


  • 111 Views
  • Uploaded on

Energy. I. Metabolic Pathways. Energy = the ability to do work Metabolic processes use chemical E (ATP) E released when chemical bonds break (e - pulled apart) Each step is regulated by enzymes. I. Photosynthesis and Nature. Sunlight provides energy to produce carbohydrates.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Energy' - reese-morse


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

I metabolic pathways
I. Metabolic Pathways

  • Energy = the ability to do work

  • Metabolic processes use chemical E (ATP)

  • E released when chemical bonds break (e- pulled apart)

  • Each step is regulated by

    enzymes


I photosynthesis and nature
I. Photosynthesis and Nature

  • Sunlight provides energy to produce carbohydrates.

  • Equation:

    Light

    6CO2 + 6H2O C6H12O6 + 6O2

    Chlorophyll

  • Autotrophs (make their own food)

    • Algae, plants, some bacteria

    • Ultimate source of food for life

    • Photoautotrophs…..

      use light energy

      4. Chemoautotrophs……

      use chemical energy

  • Photosynthesis produced the oxygen in the atmosphere of our planet.


Ii structures of photosynthesis
II. Structures of Photosynthesis

  • Chloroplasts

    • = the organelle of Photosynthesis

    • Stroma –

      fluid-filled inner space

      3. Thylakoids-

      internal membranes within stroma

      4. Organized into stacks called grana.


  • Chlorophylls and other pigments are embedded within thylakoid membranes.

  • Pigments absorb solar energy.


Iii photosynthetic pigments
III. Photosynthetic Pigments

  • Major pigments are

    chlorophyll a and b.

    • Both absorb violet, blue, and red wavelengths best.

    • Most green is reflected back.

      B. Carotinoids = yellow-orange pigments ; absorb light in violet, blue, and green regions

      C. In fall, chlorophyll breaks down and the yellow-orange pigments show through.

      D. Accessory pigments capture light when sun changes positions.


Iv cell respiration
IV. Cell Respiration

  • Breaks down glucose and builds up ATP.

  • C6H12O6 + 6O2  6CO2 + 6H2O + ATP Energy

  • Begins in cytoplasm with Glycolysis (stage 1)

    • Turns glucose (glucose is split) into pyruvic acid

    • Produces 2ATP


  • Fermentation

    • Processes that keep glycolysis going without oxygen (anaerobic)

    • Lactic Acid fermentation

      • Converts pyruvic acid into lactic acid

      • Occurs in muscle cells when oxygen not available; causes pain

      • Used by bacteria that make yogurt, cheese, pickles


  • Alcoholic Fermentation

    • Converts pyruvic acid into ethyl alcohol and CO2

    • Occurs in bacteria and yeasts

    • Used to make beer, wine, and bread


  • Aerobic Respiration

    • Need Oxygen (Oxidative Respitation- Stage 2)

    • Energy from Pyruvic Acid is transferred to ATP

      • In the Krebs Cycle

      • In the Electron Transport Chain

    • Breakdown of glucose yields 36 ATP

    • If O2 is not available to the cell, fermentation occurs.


ad