Cellular Respiration: An Overview
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Cellular Respiration: Understanding the Process of Energy Conversion in Organisms, Schemes and Mind Maps of Biology
An overview of cellular respiration, a process by which organisms convert chemical energy from food into usable energy in the presence of oxygen. the stages of cellular respiration, including glycolysis, the Krebs cycle, and electron transport, as well as the relationship between cellular respiration and photosynthesis. Learning objectives include identifying the stages of cellular respiration, explaining how energy is produced, and comparing cellular respiration to photosynthesis.
Typology: Schemes and Mind Maps
2021/2022
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Cellular Respiration: An Overview
Learning Objectives
Identify how organisms get energy. Explain how cellular respiration works. Explain the relationship between photosynthesis and cellular respiration.
Cellular Respiration
The chemical summary of cellular respiration is: What does the equation look like expressed in symbols? Oxygen + Glucose Carbon Dioxide + Water + Energy 2 6 12 6 2 2 6O + C H O 6CO + 6H O + Energy Note: this equation is a summary of many sub-reactions
Stages of Cellular Respiration
- Glycolysis
- Krebs cycle
- Electron transport Discuss: Compare the equation to the diagram-where are oxygen and glucose used?
Stage 2: Krebs Cycle
In the second stage of cellular respiration a little more energy is converted.
Stage 3: Electron Transport
The final stage requires reactants from the other two stages of the process. The most energy comes from this stage.
The Process of Cellular Respiration
Learning Objectives
Identify what happens during glycolysis. Identify what happens during the Krebs cycle. Explain how the electron transport chain uses high-energy electrons from glycolysis and the Krebs cycle. Calculate how much ATP cellular respiration generates.
Glycolysis: ATP and NADH Production
ATP and NADH are produced during glycolysis. What is required to start glycolysis, besides glucose?
The Krebs Cycle
Pyruvic acid is broken down into carbon dioxide in a series of energy-extracting reactions.
The Krebs Cycle
Pyruvic acid passes through the two membranes of the mitochondrion and into the matrix.
The Krebs Cycle: Citric Acid Production
Acetyl-CoA adds the 2-carbon acetyl group to a 4-carbon molecule already present, producing a 6-carbon molecule called citric acid.
The Krebs Cycle: Energy Extraction
For each turn of the cycle, a molecule of ADP is converted to a molecule of ATP.
The Krebs Cycle: Energy Extraction
At five places in the cycle, electron carriers accept a pair of high-energy electrons, and NAD
and FAD are converted to NADH and FADH 2.