Thursday, November 7th:

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Thursday, November 7th

• Today you will begin a WebQuest aimed to
  introduce you to
• cellular respiration. Please pick up the Cellular
• Respiration WebQuest sheet upfront, as well as
  the
• Chapter 9 Reading Guide and Unit 3 Homework.
• Grab your computer from the cart. If you can not
  remember
• your number, see Talley. Please go to my Weebly
  site to
• access the worksheet. You can directly access the
  links here

Talleysbiobin.weebly.com
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Thursday, November 7th

• Today I will
• Describe the chemical structure of ATP.
• List the stages of cellular respiration and
  provide the products of each stage.
• Differentiate between aerobic and anaerobic
  respiration.

ATP
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Cellular RespirationHarvesting Chemical Energy
Monday, Nov. 11th

• Today I will
• Describe the chemical structure of ATP.
• List the stages of cellular respiration and
  provide the products of each stage.
• Differentiate between aerobic and anaerobic
  respiration.

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The Point is to Make ATP!
Whats the point?
ATP
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(No Transcript)
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Harvesting stored energy

• Energy is stored in organic molecules
• heterotrophs eat food
• digest organic molecules
• serve as raw materials for building fuels for
  energy
• controlled release of energy
• series of step-by-step enzyme-controlled
  reactions
• burning fuels
• carbohydrates, lipids, proteins, nucleic acids

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Harvesting energy stored in glucose

• Glucose is the model
• catabolism of glucose to produce ATP

respiration
respiration making ATP ( less heat)by burning
fuels in many small steps
glucose
CO2 H2O heat
CO2 H2O ATP ( heat)
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How do we harvest energy from fuels?

• Digest large molecules into smaller ones
• break bonds move electrons from one molecule to
  another
• as electrons move they carry energy with them
• that energy is stored in another bond, released
  as heat, or harvested to make ATP

loses e-
gains e-
oxidized
reduced


e-
redox
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How do we move electrons in biology?

• Moving electrons
• in living systems, electrons do not move alone
• electrons move as part of H atom

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Coupling oxidation reduction

• Redox reactions in respiration
• release energy as break down molecules
• break C-C bonds
• strip off electrons from C-H bonds by removing H
  atoms
• C6H12O6 ? CO2 the fuel has been oxidized
• electrons attracted to more electronegative atoms
• in biology, the most electronegative atom?
• O2 ? H2O oxygen has been reduced
• release energy to synthesize ATP

? O2
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Oxidation reduction

• Oxidation
• adding O
• removing H
• loss of electrons
• releases energy
• exergonic

• Reduction
• removing O
• adding H
• gain of electrons
• stores energy
• endergonic

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Moving electrons in respiration

• Electron carriers move electrons by shuttling H
  atoms around
• NAD ? NADH (reduced)
• FAD2 ? FADH2 (reduced)

reducing power!
NAD nicotinamide Vitamin B3 niacin
carries electrons as a reduced molecule
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Overview of cellular respiration

• 4 metabolic stages
• Anaerobic respiration
• 1. Glycolysis
• respiration without O2
• in cytosol
• Aerobic respiration
• respiration using O2
• in mitochondria
• 2. Pyruvate oxidation
• 3. Krebs cycle
• 4. Electron transport chain

( heat)
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The Point is to Make ATP!
Whats the point?
ATP
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And how do we do that?

• Set up a H gradient
• Allow the H to flow through ATP synthase
• ADP Pi ? ATP

ATP