Cellular Respiration

Process of transferring energy in organic compounds to ATP

Equation = OPPOSITE OF PHOTOSYNTHESIS!!!

What was the equation for photosynthesis???

*Cellular respiration without oxygen (anaerobic) is less efficient than cellular

respiration with oxygen (aerobic)…

Anaerobic Respiration => 2 net ATPsAerobic Respiration => 36 net ATPs

Cellular Respiration is much like the “opposite” of photosynthesis.

C6H12O6 + 6O2    6CO2 + 6H2O + ATP

Formula for Cellular Respiration

(energy for the cell touse for other processes)

What will the cell use the ATP for?

Name some specific process of the cell.

Takes place in and around the mitochondrion.

What is the organelle of cellular respiration????

• Some of the steps in cellular respiration take place on the inner membrane of the mitochondrion, which is folded.

• What purpose do these folds serve?

Aerobic and Anaerobic C.R. begin with glycolysis…

**In the cytoplasm

**Anaerobic = NO OXYGEN needed

**Glucose is broken down to release energy – makes 2ATP

**Products used in Kreb’s Cycle and ETC

Glycolysis – Step One

Glucose

To the electron transport chain

2 Pyruvic acid

Let’s take a look at how plants and other cells use the

glucose that is produced.

Energy is packaged in glucose during the process of photosynthesis. However, the glucose molecule is bound together. Do you think cells can use this glucose in its current form?

NoSo what has to happen to the glucose, if it is bound together, in order for cells to use it?

The bond has to be broken and a more useable form of energy should be produced.

GLUCOSE( C6H12O6 )

OSE12O6 )

GLUC

( C6H

OSE12O6 )

GLUC ( C6H

OSE12O6 )

GLUC

( C6H

ENERGYATP

(Adenosine Triphosphate)

The presence or absence of oxygendetermines whether fermentation

(anaerobic respiration)or aerobic respiration will occur next…

No oxygen…

• Glycolysis still occurs

• Pyruvic acid (broken down glucose) is changed through fermentation

In Fermentation:

• No extra ATP is made

Two kinds:1. Lactic Acid Fermentation – causes

muscle fatigue 2. Alcoholic Fermentation –

makes beer, bread and wine

Anaerobic Respiration

1ST step – ________________*Takes place in ____________*Breaks down ___________*Makes ____ ATP

2ND step – ____________________

2 Types:

1. ______________2. ______________

Glycolysis

Glucose

Cytoplasm

Pyruvic acid

Electrons carried in NADH

Krebs Cycle

Electrons carried in NADH and

FADH2

Electron Transport Chain

Mitochondrion

Mitochondrion

If oxygen is present...

aerobic respiration can occur

Glucose

Glycolysis Krebs cycle

Electrontransport

Fermentation (without oxygen)

Alcohol or lactic acid

Chemical Pathways

Glucose(C6H1206)

+Oxygen

(02)

GlycolysisKrebsCycle

ElectronTransport

Chain

Carbon Dioxide

(CO2)+

Water(H2O)

Cellular Respiration

***Occurs in the mitochondrial matrix

* Makes carbon dioxide & 2 ATP

* Makes NADH, FADH2 (electron carriers) ETC!!

Citric Acid Production

Citric Acid Cycle (Krebs Cycle)–Step 2

Electron Transport Chain – Step 3

Occurs on proteins on inner membrane!

Electron carrier molecules (FADH2 & NADH) from Kreb’s Cycle

bring high energy e- formed in previous steps

Electron TransportHydrogen Ion Movement

ATP Production

ATP synthase

Channel

Inner Membrane

Matrix

Intermembrane Space

Mitochondrion

The electron carriers make 32 TOTAL!!!

Oxygen accepts e- which also combine with H+ to form water

Final Electron Acceptor = OXYGEN!Electron Transport

Hydrogen Ion Movement

ATP Production

ATP synthase

Channel

Inner Membrane

Matrix

Intermembrane Space

Mitochondrion

Aerobic Respiration

1st step – glycolysis*Makes ___ ATP*Takes place in __________

2nd step – Citric acid (Krebs) cycle*Makes ____ ATP*Makes ___________*Takes place in ____________

3rd step – Electron Transport Chain*Makes _____ ATP*Uses ______ to make _______*Takes place in _______________

Glycolysis – cytoplasmReactants: glucose

Products: 2 ATP and broken glucose

Krebs Cycle – matrixReactants: broken glucose

Products: CO2, 2 ATP, NADH and FADH2

ETC – inner membraneReactants: O2, NADH and FADH2

Product: Water and 32 ATP!!!

Cellular Respiration

Glycolysis

Citric Acid CycleKreb’s Cycle

Electron Transport Chain

Glucose

Broken glucose

2 ATP

Broken glucoseCO2

2 ATP

32 ATP

NADH and FADH

NADH and FADH

Oxygen

Water

October 14, 2009

Warm – Up: Write the question and answer!!!

1. Which process is an energy releasing one? a. Photosynthesis b. Cellular Respiration

2. Which statement is true?a. Only animal cells undergo CR. b. Only plant cells undergo CR. c. Both animals and plants undergo CR.

3. What molecule is broken down to make ATP?a. Glucose b. Water c. Carbon Dioxide d. Water

CR Review: Identify A, B, C, D, E

Review Photosynthesis and Cellular Respiration

• Make sure you know…– Equations of each!– Reactants of each!– Products of each!– How they are alike!– How they are different!– How they depend on each other!

***Check your understanding***

Explain the process of Photosynthesis to a neighbor using the following terms :

carbon dioxide light energy

glucose food

oxygen gas

process water

chloroplast plants

Write out your explanation using the above terms.

***Check your understanding*** Why do you think cells under go the process

of cellular respiration?

Explain the process of cellular respiration using the following terms:

carbon dioxide food molecules

glucose cells

oxygen gas

process ATP

Mitochondria water

Complete the following chart

Description of Process Reactants Products

Photosynthesis

Cellular Respiration

What do you notice about the reactant and products of cellular respiration in comparison to the reactants and

products of photosynthesis?

Compare photosynthesis and cellular respiration…

Photosynthesis Cellular Respiration

Comparison of photosynthesis and aerobic respiration

PHOTOSYNTHESIS AEROBIC RESPIRATION

Involves energy XRequires enzymes X XInvolves movement of e- X X

Forms CO2 & H20 XUses CO2 & H20 X Uses starches/ sugars & O2 XForms starches/ sugars & O2 X

X

Compare the 2 Processes…

• Table

• Venn Diagram

• Photosynthesis Flow Chart

• Cellular Respiration Flow Chart

Stations

• Photosynthesis Review

• Cellular Respiration (CR) Review

• Manipulative Review Station– Do the equation for Photosynthesis– Do the equation for CR

• T Chart – Compare Photosynthesis & CR

• Ring of Truth – Put the true statements inside the inner circle and the false statements outside the inner circle