Harnessing the energy in a snickers bar
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A presentation created for an Introductory Biology high school class learning about Cellular Respiration. Basic overview.

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Presentation Transcript

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Recap:

  • What is energy?

  • What do living things use energy for?


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Brainstorm Question:

If energy cannot be created… then how do organisms acquire energy?


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How much energy is in a Snickers bar?

Energy is measured in calories.

1 Calorie =

the amount of heat required to raise the temperature of 1g of water by 1ºC

Q: How do they figure this out for each food?


Q energy is not listed in the ingredients l.jpg

CHOCOLATE:

-high in saturated animal fats (lipids)

-high in fructose (carbs)

-protein rich (milk)

PEANUTS:

-high in plant oils (lipis)

-high in starch (carbs.)

Q: Energy is not listed in the ingredients…

CARAMEL:

-high in sucrose (carbs)

PEANUT BUTTER NOUGAT:

-high in oils (lipids)

-protein rich (egg whites)

-high in sucrose (carbs)

…so where is it?


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COMBUSTION

  • Combustion reaction takes place in the body to extract energy from the fuel.

  • Same reaction that happens in a car engine or a burning candle.

Q: Fuel does not spontaneously combust, what else is needed?


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A closer look…

  • Fuel alone does not combust (think of a lump of sugar on a plate).

    Q: What does an engine need to start?

    Q: What does a match need to burn?

    Q: What does cellular respiration require other than fuel?

  • A few different enzymes involved to help extract the most energy from the bonds.

a spark + oxygen

friction/ heat + oxygen

enzymes+ oxygen


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Reactants?

Products?

The Reaction:


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If energy is not tangible, how can it be stored?

  • We don’t use all energy right away

  • Stored in the body as chemical energy

  • Cell batteries= molecules

ATP

ADP= uncharged

ATP= CHARGED


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  • ATP molecules are synthesized during cellular respiration.

  • ATP then used to provide energy for other reactions through out the body.

  • When charge is drained, ADP is recycled in cells, gets charged again.

  • Produced in exergonic reactions, used in endergonic reactions.

    Q: Example of an endergonic reaction where it may be used?


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Back to our Snickers bar…

  • Let’s harvest the energy from a glucose molecule in it…

    (remember the body will also get energy from the fats and proteins in it, but we will use glucose as an example since it’s body’s main fuel)

Q: Glucose does not show up in the ingredients either, where is it?



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Where the respiration process takes place

STEP 2: KREBS CYCLE

STEP 3: ELECTRON TRANSPORT CHAIN

STEP 1: GLYCOLISIS

Cytosol


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Introducing the main players…

  • Glucose

  • Oxygen

  • NAD+/ NAHD

  • FADH/FADH2

  • ADP/ATP

  • ATPase


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  • Cellular Respiration Role Play

    • Who will play what molecule

    • Read the handout with the player info

    • Familiarize yourself with your role

    • Get up and find your position around or inside the mitochondria



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Basic steps

  • 1. GLYCOLYSIS (in cytoplasm)

    • Glucose broken up into 2 3-C molecules (pyruvate)

    • Some ATP made

    • H+s and E-s given off from broken bonds loaded onto coenzymes (NAD+ and FADH)

    • Loaded coenzymes “shuttle” E-s and H+s to mitochondria.


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  • 2. KREBS CYCLE (in mitochondrial matrix)

    • Atoms in the pyruvate molecules go through several rearrangements

    • Pyruvate molecules get broken down further

    • More H+s and E-s get loaded onto coenzymes and shuttled away

    • By product of Cycle is CO2, waste gas


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  • 3. ELECTRON TRANSPORT CHAIN (across mitochondrial intermembrane space)

    • NADH and FADH2 unload electrons into inner mitochondrial membrane

    • Carrier proteins pass electrons along membrane, creating gradient

    • H+s get unloaded into inter membrane space

    • ATPase uses gradient to pump hydrogen atoms across the inner membrane into matrix


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ATP Synthase (ATPase)

  • Acts like a windmill

  • The movement of protons creates the energy for ATPase to make ATP from ADP+P

More detailed ATP Synthase animation

ATPase dance (too funny!)


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Lab: (byproduct of respiration)Calorimeter

  • To determine how much energy is in food.


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Next up… (byproduct of respiration)

  • Can you respire without breathing?

  • What is more important for life- oxygen or the sun?


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FOOD FOR THOUGHT (byproduct of respiration)

This special edition Snickers bar is extra “charged”- it contains caffeine, taurineand B-vitamins. How do these ingredients contribute to the energy content of this chocolate bar?


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Image Credits (byproduct of respiration)

  • Snickers bar (slide 5)- Flickr (Got Jenna)

  • Calories graphic (slide 6)- www.deo.ucsf.edu

  • Respiration graphic (slide 12)- http://bioweb.wku.edu/courses/BIOL115/Wyatt/Metabolism/Respiration.gif

  • Mitochondria (slide 17)- Public domain (tinojasontran)

  • TEM human lung tissue (slide 16)- Public domain (Louisa Howard)

  • Cell (slide 16)- European Bioinformatics Institute

  • Calorimeter (slide 26)- www.sciencebuddies.com

  • ATP synthase animation (slide 24)- Dr. Kaiser http://student.ccbcmd.edu/~gkaiser/biotutorials/energy/atpsynthase_an.html permission pending

  • Snickers Charged (slide 28)- Flickr (the futuristics)

  • Snickers bar info (slides 4 +15)- www.snickers.com

  • Clipart (slides 3+26)- Discovery School Clipart gallery


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