lesson overview lesson overview cellular respiration: an overview objectives 9.1 cellular...
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Lesson Overview Cellular Respiration: An Overview
Objectives 9.1 Cellular Respiration
-Explain where organisms get the energy they need for life processes.
-Define cellular respiration.
-Compare photosynthesis and cellular respiration.
Lesson Overview Cellular Respiration: An Overview
Chemical Energy and Food
Food molecules contain chemical energy that is released when its chemical bonds are broken during a process called CELLULAR RESPIRATION.
Lesson Overview Cellular Respiration: An Overview
What is a Calorie?Energy stored in food is expressed in units called calories.
A Calorie is the amount of energy needed to raise the temperature of 1 gram of water by 1 degree Celsius.
Lesson Overview Cellular Respiration: An Overview
Overview of Cellular RespirationIf oxygen is available, organisms can obtain energy from food by a process called cellular respiration.
Equation:6 O2 + C6H12O6 6 CO2 + 6 H2O + Energy
In words:Oxygen + Glucose Carbon dioxide + Water + Energy
Lesson Overview Cellular Respiration: An Overview
Stages of Cellular Respiration
The three main stages of cellular respiration are:
1. Glycolysis2. Krebs cycle3. The electron transport chain
Lesson Overview Cellular Respiration: An Overview
Stage 1: Glycolysis
Glycolysis is anaerobic and produces only a small amount of energy.
*2 ATP molecules*
Lesson Overview Cellular Respiration: An Overview
Stage 2: Krebs Cycle
During the Krebs cycle, a little more energy is generated using pyruvic acid to power the Electron Transport Chain.
*2 ATP molecules*
Lesson Overview Cellular Respiration: An Overview
Stage 3: The Electron Transport Chain
The electron transport chain produces the bulk of the energy in cellular respiration by using oxygen.
*32 net ATP molecules*
Lesson Overview Cellular Respiration: An Overview
Aerobic vs AnaerobicAerobic = with oxygen
Anaerobic = without oxygen
Lesson Overview Cellular Respiration: An Overview
Photosynthesis and Cellular Respiration
Photosynthesis and cellular respiration are opposite processes.
The energy flows in opposite directions.
Lesson Overview Cellular Respiration: An Overview
True or False
1. Either cellular respiration or fermentation can be used to release
energy, depending on the presence of carbohydrates.
_________________________
2. The Krebs cycle releases energy in the form of ATP.
_________________________
3. Electron carriers bring electrons from glycolysis and the Krebs
cycle to the electron transport chain. _________________________
4. Without the Krebs cycle, the electron transport chain cannot
function. _________________________
Lesson Overview Cellular Respiration: An Overview
ANSWERS
1. Either cellular respiration or fermentation can be used to release
energy, depending on the presence of carbohydrates. False,
oxygen
2. The Krebs cycle releases energy in the form of ATP. True
3. Electron carriers bring electrons from glycolysis and the Krebs
cycle to the electron transport chain.True
4. Without the Krebs cycle, the electron transport chain cannot
function. True
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