What is the source of electrons in photosynthesis?
In photosynthesis, water is the source of electrons and their final destination is NADP+ to make NADPH. In mitochondria, NADH/FADH2 are electron sources and H2O is their final destination.
What is the source of electrons in plants?
Answer and Explanation: In the electron transport process of photosynthesis, water is used as the electron source.
Where do electrons come from in chloroplasts?
The chlorophyll obtains its electrons from water (H2O), producing O2 as a by-product. During the electron-transport process, H+ is pumped across the thylakoid membrane, and the resulting electrochemical proton gradient drives the synthesis of ATP in the stroma.
Where do the electrons come from in cellular respiration?
It occurs in mitochondria in both cellular respiration and photosynthesis. In the former, the electrons come from breaking down organic molecules, and energy is released. In the latter, the electrons enter the chain after being excited by light, and the energy released is used to build carbohydrates.
Where do electrons get their energy in photosystem II?
The heart of photosystem II is the reaction center, where the energy of light is converted into the motion of energized electrons. At the center is a key chlorophyll molecule. When it absorbs light, one of its electrons is promoted to a higher energy.
Where do the electrons in the electron transport chain come from in photosynthesis?
The electron transport chain is a series of electron transporters embedded in the inner mitochondrial membrane that shuttles electrons from NADH and FADH2 to molecular oxygen. In the process protons are pumped from the mitochondrial matrix to the intermembrane space and oxygen is reduced to form water.
Where do electrons get their energy in photosystem?
The heart of photosystem II is the reaction center, where the energy of light is converted into the motion of energized electrons. At the center is a key chlorophyll molecule. When it absorbs light, one of its electrons is promoted to a higher energy.
Where do the electrons come from in glycolysis?
As in aerobic respiration, Glycolysis also delivers high-energy electrons taken from glucose to electron carriers.
Where does the electron transport chain take place in photosynthesis?
the thylakoid membrane In photosynthetic eukaryotes, the electron transport chain is found on the thylakoid membrane.
Where do electrons get their energy in photosystem I?
Answer and Explanation: Electrons in Photosystem I gain their energy when chlorophyll or carotenoid molecules absorb light and get into a photoexcited state.
Where do replacement electrons come from in photosystem II?
Photosystem II obtains replacement electrons from water molecules, resulting in their split into hydrogen ions (H+) and oxygen atoms. The oxygen atoms combine to form molecular oxygen (O2), which is released into the atmosphere. The hydrogen ions are released into the lumen.
Where is the electron transport chain in photosynthesis?
the thylakoid membrane In photosynthetic eukaryotes, the electron transport chain is found on the thylakoid membrane. Here, light energy drives electron transport through a proton pump and the resulting proton gradient causes subsequent synthesis of ATP.
What is the source of electrons in cellular respiration?
Comparison chart
| Cellular Respiration | |
|---|---|
| Occurs in which organelle? | Mitochondria Glycolysis (cytoplasm) |
| Final electron receptor | O2 (Oxygen gas) |
| Occurs in which organisms? | Occurs in all living organisms (plants and animals). |
| Electron source | Glucose, NADH + , FADH2 |
Where do replacement electrons come from in photosystem 2?
Photosystem II obtains replacement electrons from water molecules, resulting in their split into hydrogen ions (H+) and oxygen atoms. The oxygen atoms combine to form molecular oxygen (O2), which is released into the atmosphere. The hydrogen ions are released into the lumen.
Where do the electrons that are excited by the energy in sunlight come from?
The light excites an electron from the chlorophyll a pair, which passes to the primary electron acceptor. The excited electron must then be replaced. In (a) photosystem II, the electron comes from the splitting of water, which releases oxygen as a waste product.
What provides the source of electrons to the electron transport chain?
All of the electrons that enter the transport chain come from NADH and FADH 2start subscript, 2, end subscript molecules produced during earlier stages of cellular respiration: glycolysis, pyruvate oxidation, and the citric acid cycle.
How does the electron transport chain work in photosynthesis?
Electron transport helps establish a proton gradient that powers ATP production and also stores energy in the reduced coenzyme NADPH. This energy is used to power the Calvin Cycle to produce sugar and other carbohydrates.
Where does electron come from in cellular respiration?
In cellular respiration, electrons from glucose move gradually through the electron transport chain towards oxygen, passing to lower and lower energy states and releasing energy at each step.