CELLULAR RESPIRATION - Bakersfield 11... · cellular respiration Cellular Energy 19 . Aerobic Cellular…

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  • CELLULAR RESPIRATION

    Professor Andrea Garrison Biology 11

    Illustrations 2010 Pearson Education, Inc. , unless otherwise noted

  • Cellular Respiration

    Rearranges complex molecules to simpler molecules and uses energy released to make ATP

    Cellular Energy 2

  • Cellular Respiration

    Rearranges complex molecules to simpler molecules and uses energy released to make ATP

    Provides all energy used by cell

    Cellular Energy 3

  • Cellular Respiration

    Rearranges complex molecules to simpler molecules and uses energy released to make ATP

    Provides all energy used by cell

    Occurs in mitochondrion

    Cellular Energy 4

  • Cellular Respiration

    Can occur with or without O2

    Aerobic respiration occurs with O2

    Most organisms

    Anaerobic respiration occurs without O2

    Strict anaerobes only respire without O2

    Facultative anaerobes use O2 if its present Ex. Human muscle cells will go into O2 debt if no O2

    Ex. Yeast will produce ethanol if no O2

    Cellular Energy 5

  • Aerobic Cellular Respiration

    Overall Equation:

    And always some energy lost as waste heat

    Cellular Energy 6

  • ATP transfers energy within the cell

    Cellular Energy 7

  • Aerobic Cellular Respiration

    4 basic steps

    Goal of each step is to:

    break bonds between carbons

    Get rid of carbons as CO2

    keep the energy from bonds (as e-s) to make ATP

    Cellular Energy 8

    Modified by A. Garrison

  • Aerobic Cellular Respiration

    4 basic steps 1. Glycolysis (outside mito)

    splits 6C sugar in half

    *Steps 2,3,4 occur inside mito

    2. 3C molecule converted to 2C molecule

    3. Citric Acid Cycle breaks rest of carbons apart

    4. Electron Transport Chain uses captured e-s to make ATP

    Cellular Energy 9

    Modified by A. Garrison

  • Aerobic Cellular Respiration

    Each time bonds are broken, e-s are picked up by an electron carrier (H+s travel with e-s)

    NAD+ and FADH are electron carriers

    NAD+ + 2 e-s + 2H NADH + H+

    FAD + 2 e-s + 2H FADH2

    Cellular Energy 10

  • Aerobic Cellular Respiration

    Lets look at the physical properties of electrons in molecules and see what these

    captured electrons can do

    Cellular Energy 11

  • Electrons in energy shells of atoms

    Cellular Energy 12

    H C N O 1 e- 6 e-s 7 e-s 8 e-s

    Shell can hold 2 e-s

    Shell can hold 8 e-s

  • Electrons fill lower shells first

    Cellular Energy 13

    2010 Pearson Education, modified by A. Garrison

  • Electron not stable in higher shell if lower shell not filled

    Cellular Energy 14

    2010 Pearson Education, modified by A. Garrison

  • Can excite electrons by adding energy

    Cellular Energy 15

    energy Excited e-

    2010 Pearson Education, modified by A. Garrison

  • Electrons will fall back to lower shell and release energy

    Cellular Energy 16

    Excited e- falls back

    Energy released --as light --as heat

    2010 Pearson Education, modified by A. Garrison

  • Electron transport e- falls to lower shell of different molecule

    Cellular Energy 17

    e- from higher shell falls to lower shell of another molecule

    Energy released --as ATP

    2010 Pearson Education, modified by A. Garrison

  • Electron transport in mitochondrion

    e-s fall to lower energy shells of successive e- carriers, giving off energy to make ATP

    Cellular Energy 18

  • Aerobic Cellular Respiration

    Now lets look at the details of

    cellular respiration

    Cellular Energy 19

  • Aerobic Cellular Respiration

    Two forms of glucose molecule; both found in solution

    Cellular Energy 20

  • Aerobic Cellular Respiration

    1. Glycolysis-- occurs in cytoplasm outside mitochondrion glucose + 2ATP + 2NAD+ 2 pyruvic acid + 4ATP + 2NADH 6C 3C

    Cellular Energy 21

    Modified by A. Garrison

    NADH

    ATP +

    NADH

  • Aerobic Cellular Respiration

    2. If no O2 present, 3 C molecule converted to lactic acid; aerobic cellular respiration stops

    Cellular Energy 22

    Modified by A. Garrison

    Glycolysis

    NADH

    NADH

  • Aerobic Cellular Respiration

    2. If O2 present, 3 C molecule converted to 2C molecule 3C pyruvic acid + NAD+ 2C + CO2 + 2 NADH

    Cellular Energy 23

    Modified by A. Garrison

    + CO2 + Glycolysis

    NADH

    NADH

    NADH

  • Aerobic Cellular Respiration

    3. Citric Acid Cycle occurs in matrix of mitochondrion Breaks apart the 2C molecule to get energy in bonds

    Cellular Energy 24

    NADH

    NADH NADH FADH2

    2C

    + ATP, NADH, FADH2

    CO2

    CO2

    6C

    4C

    5C Every step requires specific

    enzymes

  • Aerobic Cellular Respiration

    4. Electron Transport Chain occurs on cristae of mitochondrion

    Most ATP made here

    Cellular Energy 25

    NADH

    NADH NADH FADH2

    NADH FADH2

  • Electron transport in mitochondrion

    Cellular Energy 26

  • Electron transport in mitochondrion

    Cellular Energy 27

  • Aerobic Cellular Respiration

    Cellular Energy 28

  • Aerobic Cellular Respiration

    Cellular Energy 29

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