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Cellular Respiration Harvesting Chemical Energy

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Title: Cellular Respiration Harvesting Chemical Energy Author: Farrell, Wendy Last modified by: mfcsd Document presentation format: On-screen Show (4:3) – PowerPoint PPT presentation

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Title: Cellular Respiration Harvesting Chemical Energy


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C6H1206 602 ? 6C02 6H20 energy in ATP
Cell respiration 6C02 6H20 light energy ?
C6H1206 602 Photosynthesis
Glucose C6H1206
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Cellular RespirationHarvesting Chemical Energy
ATP
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Burn fuels to make energy
combustion making heat energy by burning fuels in
one step
aerobic respiration making ATP energy ( some
heat) by burning fuels in many small steps
ATP CO2 H2O ( heat)
6
Energy needs of life
  • Animals are energy consumers
  • What do we need energy for?
  • synthesis (building for growth)
  • reproduction
  • active transport
  • movement
  • temperature control (making heat)

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Where do we get energy?
  • Energy is stored in organic molecules
  • carbohydrates, fats, proteins
  • Animals eat these organic molecules ? food
  • digest food to get
  • fuels for energy (ATP)
  • raw materials for building more molecules
  • carbohydrates, fats, proteins, nucleic acids

ATP
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What is energy in biology?
ATP
Adenosine TriPhosphate
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Harvesting energy stored in food
  • Cellular respiration
  • breaking down food to produce ATP
  • in mitochondria
  • using oxygen
  • aerobic respiration
  • usually digesting glucose
  • but could be other sugars, fats, or proteins

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Which of the following is a product of cell
respiration?
  1. ATP
  2. Glucose
  3. Oxygen
  4. NADPH

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Cell Respiration takes place in the
  1. Chloroplast
  2. Nucleus
  3. Mitochondria
  4. Rough ER

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What do we need to transform chemical energy in
food?
Make ATP!Make ATP!All I do all dayAnd no
oneeven notices!
  • The Furnace for transfering energy
  • mitochondria
  • Fuel
  • food carbohydrates, fats, proteins
  • Helpers
  • oxygen
  • enzymes
  • Product
  • ATP
  • Waste products
  • carbon dioxide
  • then used by plants
  • water

enzymes
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Mitochondria are everywhere!!
animal cells
plant cells
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Using ATP to do work?
ATP
  • Cant store ATP
  • too unstable
  • only used in cell that produces it
  • only short term energy storage

work
Adenosine TriPhosphate
Adenosine DiPhosphate
ADP
A working muscle recycles over 10 million ATPs
per second
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A Bodys Energy Budget
make energy
1
ATP
eatfood
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synthesis (building)
3
storage
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Mitochondria Structure
  • Double membrane bound organelle
  • Contains its own DNA (different from nucleus
    DNA)
  • Matrix jelly-like fluid
  • Cristae folds of membrane within the
    mitochondria

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Steps of Cellular Respiration
  • 1. Glycolysis (Anaerobic does not require
    oxygen)
  • 2. Krebs Cycle (Aerobic- requires oxygen)
  • 3. Electron Transport Chain (Aerobic)

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Which of the following processes requires oxygen?
  1. Photosynthesis
  2. Aerobic Respiration
  3. Anaerobic Respiration
  4. Glycolysis

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Which of the following is NOT a stage of cell
respiration?
  1. Krebs Cycle
  2. Calvin Cycle
  3. Glycolysis
  4. Electron Transport

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The first step of respiration is
  1. Glycolysis
  2. Kreb Cycle
  3. Calvin Cycle
  4. Electron Transport Chain

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Plants conduct which of the following processes?
  1. Glycolysis
  2. Photosynthesis only
  3. Respiration only
  4. Both Photosynthesis and respiration

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Glycolysis takes place in the
  1. Mitochondrial matrix
  2. cytoplasm
  3. Cell membrane
  4. Cristae of mitochondria

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Step 1 Glycolysis
  • Takes place in cytoplasm
  • Anaerobic process- no oxygen required
  • Splits glucose into two 3-carbon molecules called
    pyruvate
  • REACTANTS (IN) Glucose, 2 ATP, 2 NAD, and 4
    ADP
  • PRODUCTS 2 ADP, 2 NADH, 4 ATP, 2 Pyruvate
  • Net gain 2 Pyruvate, 2 NADH and 2 ATP

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Step 2 Krebs Cycle
  • Takes place in matrix of mitochondria
  • Aerobic Process will not happen without the
    presence of oxygen
  • Electron carriers NADH and FADH2 are produced
    from NAD and FAD
  • NADH and FADH2 go to the Electron Transport Chain
    to be used to make more ATP
  • Carbon Dioxide is released
  • 2 ATP are produced

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Step 3 Electron Transport Chain
  • Takes place in cristae of mitochondria
  • Aerobic process uses oxygen
  • Uses the NADH produced in Glycolysis the Krebs
    Cycle
  • Uses the FADH2 produced in the Krebs Cycle
  • Produces 34 ATP!!!!
  • Water is released

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What if oxygen is missing?
  • No O2 available cant carry out Krebs cycle or
    electron transport
  • Anaerobic respiration
  • glycolysis followed by fermentation
  • alcohol fermentation-yeasts
  • lactic acid fermentation-bacteria
  • skeletal muscle
  • Cells must survive on 2 ATP/gluocse
  • produced during Glycolysis
  • Repeating cycles of glycolysis
  • fermentation
  • large animals cannot survive

yeast
bacteria
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Anaerobic Respiration
Fermentation does NOT produce ATP! It regenerates
glycolysiss reactant NAD so that glycolysis
can be repeated again again while conditions
are anaerobic.
  • Fermentation
  • alcohol fermentation
  • yeast
  • glucose ? ATP CO2 alcohol
  • make beer, wine, bread
  • lactic acid fermentation
  • bacteria, animals
  • glucose ? ATP lactic acid
  • bacteria make yogurt
  • animals feel muscle fatigue

Tastes goodbut not enoughenergy for me!
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