Dear my beloved students :-)
You can find the topic to discuss after the "biochem lesson" as following:
In both photosynthesis and cullular respiration, there is the electron transport through the protein chain, and the result is to produce ATP.
Then, what is are the similarities and differences of electron transport in photosynthesis and cullular respiration?
looking forward to your active contribution!
Van Anh
Dear you guys, this is some information about the similarities and differences of electron transport in photosynthesis and cullular respiration that I found.
Similarities: They both have electrons bouncing down a gradient, both rely on chemiosmosis. The electrons move down a concentration gradient, in both photosynthesis and respiration.
They both make ATP.
Differences:
In photosynthesis the electrons are moving due to the energy input of light while in cellular respiration the electrons were lent to the ETC by the NADH. Another difference is that in photosynthesis the primary electron acceptor is NADPH and in cellular respiration it is oxygen.
|
|
PHOTOSYNTHESIS |
RESPIRATION |
|
The moving of electron |
Due to energy input of light |
Lent to the electron transport chain by NADH |
|
The primary electron acceptor |
NADPH |
Oxygen |
* Similarities: They have ADP and Pi to make ATP
* Difference:
| PHOTOSYNTHESIS | CELLULAR RESPIRATION | |
|---|---|---|
| 1. | Photosynthetic organisms attempt to foment glucose as a food source | Organisms that utilize cellular respiration break glucose down into ATP |
| 2. | Store energy | Relese energy |
| 3. | Using light to push electron from ground state to excited state | no |
| 4. | H20 is a material providing electron | NADH is a material providing electron |
| 5. | Product: ATP, NADH | Product: ATP |
| 6. | Take place in thylakoid membrane | Take place in mitochondria inner membrane |
About the similarities of electron transport in photosynthesis and cullular respiration, I totally agree with Pham Ngoc Ha.
I just want to talk more about the differences between electron transport in photosynthesis and cullular respiration:
Photosynthesis:
- Water is broken down to oxygen to release electrons for an electron transport chain
- Electrons from the transport chain are taken up by hydrogen carriers (NADPH specifically)
- Uses the Calvin cycle to synthesise glucose (requires hydrogen carriers and carbon dioxide
Cell Respiration:
- Uses the Krebs cycle to break down glucose (releases hydrogen carriers and carbon dioxide)
- Hydrogen carriers release electrons for an electron transport chain (NADH and FADH2 specifically)
- Electrons from the transport chain are taken up by oxygen (to form water)
I agree with idea of people above, and i’ve found images that can make clear that information and help us can imagine easier
Similarities:
1. Both have e- flow throung a chain of membrane
2. Establish H+ gradient across membrane
3. Have chemiosmotic coupling => ATP synthase
Differences:
|
|
Photosynthesis |
Cellular respiration |
|
Electron donor and acceptor |
- Donner: H2O - Acceptor: NADP+ |
- Donner: NADPH and FADH2 - Acceptor: O2 |
|
H+ gradient established |
- Spliting H2O in the lumen - Pumping H+ from stroma into lumen - NADP+ + H+ -> NADPH in stroma => Gradient in stoma < Gradient in lumen |
- Pumping H+ from matrix to IMS - Making H2O in matrix => Gradient in matrix < Gradient in IMS |
|
Energy source |
- Come from light |
- Come from breaking the chemical bonding in the organic compounds
|
PHOTOSYNTHESIS & CELLULAR RESPIRATION ELECTRON TRANSPORT CHAIN RELATIONSHIP
1. Similarities
-Appear in the final step of each of the long-term process
-Use the redox reaction and chemiosmosis process
-Mobile carrier: Cyt
-Movement of proton: from the outer matrix to the interior
2. Differences
| Photosynthesis | Cellular Respiration | |
|---|---|---|
| Name of the step-consisted | Photophosphorylation | Oxidative Phosphorylation |
| Membrane | Thylakoid/ Inner membrane | Mitochondria inner membrane |
| Mobile carrier | Plastoquinone (Pq), Plastocyanin (Pc), |
Ubiquinone (Q) |
| Electron-carrier | NADPH | NADH, FADH2 |
| Electron derived from | Using light energy to split H2O in photolysis | Catabolic oxidation of nutrients |
When we talk about Photosynthesis and photorespiration, we can remember that both of processes is opposite, right? Photosynthesis will apply CO2 and creat O2 and photorespiration is opposite.Photosynthesis in the membrane thylakoid or Inner membrane. Process is apply light and H20 in light dependent reactions, with Electron-carrier ATP and NADPH. So on, mobile carrier is plastoquinone, plastocyanin. Beside, Cellular respiration in mitochondria inner membrane and Electron-carrier NADH, FADH2.
1. Similarity
- Both have electron flow in membrane
- Both create H+ gradient across membrane
- Both produce ATP from ADP
2. Diffenrence
* electron donor:
- in photosynthesis. electrons come from H20 (require energy from sunlight)
- in respiration, electrons come from NADH and FADH2
* location
- in photosynthesis, H+ pump from thylakoid to stoma => High H+ concentration in the thylakoid lumen
- in respiration, H+ pump from the matrix to intermembrane space =>High H+ concentration in the intermembrane space
*product
- In photosynthesis, creating 02 from H20 and release H+
- in respiration, making H20 in matrix
The similarities and differences of electron transport in photosynthesis and cullular respiration:
1. The similarities:
+ Both have e- flow through a chain of membrane
Both have redox reaction.
+ Both establish H+ gradient across membrane
+ Both have chemiosmotic coupling (ATP)
2. The differences:
* Respiration:
- The e- transport chain in mitochondria uses the lipid-soluble e- carrier ubiquinone to move e- within the membrane. Other quinones are used in the e- transport chains in chloroplasts
- Through the action of the e- transport chains, protons (H+) are pumped across the inner membrane of the mitochondria from the matrix to the inner membrane space building up potential energy as an electrochemical gradient. In chemiosmosis, the protons (H+) move back across the inner membrane through ATP synthase, and in doing so generate ATP.
- The final e- acceptor for the e- transport chain in aerobic respiration is O2, which is reduced to H2O.
* Photosynthesis
- The e- transport chains in chloroplasts use the lipid-soluble e- carriers plastoquinone and phylloquinone to move e- within the membrane. Ubiquinone is used for this purpose in mitochondria.
- Through the action of the e- transport chains, protons (H+) are pumped across the thylakoid membrane from the stroma to the lumen (the inner thylakoid space) building up potential energy as an electrochemical gradient. In chemiosmosis, protons (H+) move back across the thylakoid membrane through ATP synthase, and in doing so generate ATP.
According to my perspective,
The similarities between Photosynthesis and cellular resparation is:
Cellular Respiration and Photosynthesis both have an ATP Synthase. These processes both have buildups of H+ and the ATP Synthase transports the hydrogen ions down the concentration gradient.
Differences:
| BASIS FOR COMPARISON | CELLULAR RESPIRATION | PHOTOSYNTHESIS |
|---|---|---|
| Meaning | Cellular respiration is the process of converting energy and providing it to the different cells of the body. Here the glucose and oxygen are converted to carbon dioxide and water, and thus energy (ATP) is released. | The process of using the sunlight and water to convert it into energy is called as photosynthesis, which is specially performed by the green plants and few bacteria. The green pigment called chlorophyll is responsible for this conversion process. |
| Occurs in | The living cell, as well in green and non-green plants. | Photosynthesis occurs only in plants containing chlorophyll. |
| Cellular respiration occurs in light (day) as well as in the dark (night). | Photosynthesis takes place in light (day) only. | |
| Reaction involved | 1. Glycolysis which occur in the cell cytoplasm. 2. Krebs or Citric acid cycle occurs in the mitochondrial matrix of the cell. 3. Electron Transport Chain or oxidative phosphorylation which occurs in the mitochondrial membrane. | 1. The light reaction which occurs in grana of the chloroplast. 2. Dark reaction or Calvin cycle taking place in the stroma of the chloroplast. 3. Photolysis or Water-spitting complex which takes place in thylakoid lumen. |
| Energy | It is an exothermic reaction, as energy is released during this process. | It is an endothermic process, as energy is stored or utilised. |
| The energy which is released is in the form of ATP is used in various metabolic activities. | The energy is in the form of glucose or chemical energy, which is used during the dark reaction. | |
| The potential energy is converted into the kinetic energy. | Light energy is converted into potential energy. | |
| Oxidative phosphorylation | In the cellular respiration oxidative phosphorylation occurs. | Here photophosphorylation occurs. |
| Other activities | It is a catabolic process. | It is an anabolic process. |
| Oxygen and carbohydrates are absorbed in the process. | Oxygen and carbohydrates released. | |
| Carbon dioxide and water are released. | Carbon dioxide and water are absorbed. |
Differences
Photosynthesis makes the glucose that cellular respiration uses to make ATP.
Plants are autotrophs , meaning that they make their own food from inorganic substances and sunlight = photosynthesis.
Photosynthesis :
- Input: water, CO2 and sunlight
- Output: glucose and O2.
This glucose is food for the plant, but is not yet usable energy. Cells of plants use mainly the molecule ATP (adenosine triphosphate) as energy.
Cellular respiration:
- Input: glucose and O2
- Output: CO2, water and ATP (energy)
|
Cellular Respiration |
Photosynthesis |
|
|
Production of ATP |
Yes |
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 + 6H20 |
|
Process |
Production of ATP via oxidation of organic sugar compounds. [1] glycolosis: breaking down of sugars; occurs in cytoplasm [2] Krebs Cycle: occurs in mitochondria; requires energy [3] Electron Transport Chain-- 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. |
- similarities: Cellular Respiration and Photosynthesis both have an ATP Synthase. These processes both have buildups of H+ and the ATP Synthase transports the hydrogen ions down the concentration gradient. This process is called Chemiosmosis.
-difference:
Photosynthesis is the process by which green plants create their own food by turning light energy into chemical energy. Chlorophyll in the leaves transforms carbon dioxide, water, and minerals into oxygen and glucose. Photosynthesis takes place in the chloroplasts of cells.
Cellular respiration, on the other hand, is the process by which living things convert oxygen and glucose to carbon dioxide and water, thereby yielding energy. It does not require the presence of sunlight and is always occurring in living organisms. Cellular respiration takes place in the mitochondria of cells.
I am so sorry.
I do not have anything (else) to contribute.
I am so sorry.
The comparisons of the electron transport chain (ETC) between photosynthesis and cellular respiration:
1. The similarities:
- They both have electrons bouncing down the gradient to synthesize ATP.
- 3 ATP are synthesized by 2 protons.
- All reactions occur within the chains are chemi-osmosis.
2. The differences:
| Photosynthesis | Respiration | |
| ETC | Oxidative phosphorylation | Photophosphorylation |
| Source of energy | Chemical energy is derrived from redox reactions | Chemical energy is derrived from light |
| Location | Cristae of mitochondria | Thylakoid membrane of chroloplast |
| Co-enzyme | NAD and FAD | NADP |
| Proton gradient | Proton gradient acts from the intermembrane space up to the matrix | Proton gradient acts from thylakoid space to the stroma of the chloroplast |
| FInal electron acceptor | Oxygen | Chlorophyll in cyclic photophosphorylation NADPH+ in noncyclic photophosphorylation |
The similarities are that they both make ATP, they both have the process of chemiosmosis and the electrons moving down the concentration gradient.
The first difference is In photosynthesis, the electron transport chain occurs at the beginning of the process, but it comes at the end of the process in cellular respiration.
The second difference is that photosynthesis uses the energy obtained from light to free electrons from the chlorophyll pigments that collect the light and the electrons are moving due to the energy input of light. While in cellular respiration the electrons were lent to the ETC by the NADH.
Another difference is that in photosynthesis the primary electron acceptor is NADPH but in cellular respiration it is oxygen.
Compare of electron transpor between photosynthesis and cellular respiration.
1. Similarities.
- Both have e- flow through a chain pf membrane bound carrier.
=> Both have redox rxns (sportaneous/exergonic)
- Both estalis H+ (pH) gradients across a membrane.
=> "downhill" flow of e- driver "unhill" flow of H+
- Both have chemiosmoyic coupling.
=> coupling "downhill" flow of H+ back across the membrane throung specific protein channels (F0 in mitochondria and CF0 in chloroplast) with phosphorylation of ADP to make ATP (done by F1 in motochondria and CF1 in chloroplast) (ATP synthesis in both casses).
2. Differences.
- Photosynthesis:
- Water is broken down to oxygen to release electrons for an electron transport chain
- Electrons from the transport chain are taken up by hydrogen carriers (NADPH specifically)
- Uses the Calvin cycle to synthesise glucose (requires hydrogen carriers and carbon dioxide)
- 6CO2 + 6H2O + energy = 6C12H6O + 6O2
- Cell Respiration:
- Uses the Krebs cycle to break down glucose (releases hydrogen carriers and carbon dioxide
- Hydrogen carriers release electrons for an electron transport chain (NADH and FADH2 specifically)
- Electrons from the transport chain are taken up by oxygen (to form water)
- 6C12H6O + 6O2 = 6CO2 + H2O
Here is what I’ve found:
Photosynthesis
Photosynthesis uses the energy obtained from light to free electrons from the chlorophyll pigments that collect the light. Chlorophyll molecules do not have an infinite supply of electrons, so they regain the lost electron from a molecule of water. What remains are electrons and hydrogen ions (electrically charged particles of hydrogen). Oxygen is created as a byproduct, which is why it is expelled into the atmosphere.
Cellular respiration
In cellular respiration the electron transport chain occurs after glucose has already been broken down. Eight molecules of NADPH and two molecules of FADH2 remain. These molecules are intended to donate electrons and hydrogen ions to the electron transport chain. The movement of electrons galvanizes hydrogen ions across the membrane of the mitochondrion. Because this forms a concentration of hydrogen ions on one side, they are compelled to move back to the inside of the mitochondrion, which galvanizes the synthesis of ATP. At the very end of the process, electrons are accepted by oxygen, which then binds to the hydrogen ions in order to produce water.