Difference between cellular Respiration and Photosynthesis

Difference between cellular Respiration and Photosynthesis

 

Difference between cellular Respiration and Photosynthesis

Cellular Respiration Photosynthesis
Production of ATP Yes; theoretical yield is 38 ATP molecules per glucose but actual yield is only about 30-32. Yes
Reactants C6H12O6 and 6O2 6CO2 and 12H2O and light energy
Requirement of sunlight Sunlight not required; cellular respiration occurs at all times. Can occur only in presence of sunlight
Chemical Equation (formula) 6O2 + C6H12O6 → 6CO2 +6H2O + ATP (energy) 6CO2 + 12H2O + light → C6H12O6 + 6O2 + 6H2O
Process Production of ATP via oxidation of organic sugar compounds. Glycolysis: breaking down of sugars; occurs in cytoplasm Krebs Cycle: occurs in mitochondria; requires energy. Electron Transport Chain proteins in mitochondria; converts O2 to water. The production of organic carbon (glucose and starch) from inorganic carbon (carbon dioxide) with the use of ATP and NADPH produced in the light dependent reaction
Fate of oxygen and carbon dioxide Oxygen is absorbed and carbon dioxide is released. Carbon dioxide is absorbed and oxygen is released.
Energy required or released? Releases energy in a step wise manner as ATP molecules Requires energy
Main function Breakdown of food. Energy release. Production of food. Energy Capture.
Chemical reaction Glucose is broken down into water and carbon dioxide (and energy). Carbon dioxide and water combine in presence of sunlight to produce glucose and oxygen.
Stages 4 stages: Glycolysis, Linking Reaction (pyruvate oxidation), Krebs cycle, Electron Transport Chain (oxidative phosphorylation). 2 stages: The light dependent reaction, light independent reaction. (also called light cycle & Calvin cycle)
 

What powers ATP synthase

 

H+ proton gradient across the inner mitochondria membrane into matrix. High H+ concentration in the intermembrane space.

 

H+ gradient across thylakoid membrane into stroma. High H+ concentration in the thylakoid lumen

Products 6CO2 and 6H2O and energy(ATP) C6 H12 O6 (or G3P) and 6O2 and 6H2O
What pumps protons across the membrane Electron transport chain. Electrochemical gradient creates energy that the protons use to flow passively synthesizing ATP. Electron transport chain
Occurs in which organelle? Mitochondria Chloroplasts
Final electron receptor O2 (Oxygen gas) NADP+ (forms NADPH )
Occurs in which organisms? Occurs in all living organisms (plants and animals). Occurs in plants, protista (algae), and some bacteria.
Electron source Glucose, NADH + , FADH2 Oxidation H2O at PSII
Catalyst – A substance that increases the rate of a chemical reaction No catalyst is required for respiration reaction. Reaction takes places in presence of chlorophyll.
High electron potential energy From breaking bonds From light photons.

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Dr. Bbosa Science

 

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