How does light interact with the electron transport chain?
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.
Where does the electron transport chain transfer light energy in photosynthesis?
The light-dependent reactions use light energy to make two molecules needed for the next stage of photosynthesis: the energy storage molecule ATP and the reduced electron carrier NADPH. In plants, the light reactions take place in the thylakoid membranes of organelles called chloroplasts.
How is energy transferred from light to ATP?
During the process of photosynthesis, light penetrates the cell and passes into the chloroplast. The light energy is intercepted by chlorophyll molecules on the granal stacks. Some of the light energy is converted to chemical energy. During this process, a phosphate is added to a molecule to cause the formation of ATP.
Does the electron transport chain require light?
The light-dependent reactions take place in the thylakoid membrane, inside chloroplasts. Since they are light ‘dependent’ reactions, you can guess that these reactions need light to work.
How does an electron transport chain lead to the generation of ATP in the light-dependent reactions of photosynthesis?
The electron transport chain directly absorbs light energy and transforms it into the chemical energy of ATP. c. The movement of electrons down the electron transport chain drives the formation of a protons gradient that is used to make ATP.
What happens during the electron transport chain of the light reactions quizlet?
What happens during the electron transport chain of the light reactions? The electrons get increasingly excited as they move up the chain. The electrons interact with oxygen to move up the chain. The electrons release their energy, which is captured by ATP and NADPH.
How are electrons transferred during photosynthesis?
Electrons are transferred sequentially between the two photosystems, with photosystem I acting to generate NADPH and photosystem II acting to generate ATP. The pathway of electron flow starts at photosystem II, which is homologous to the photosynthetic reaction center of R. viridis already described.
What provides electrons for the light reactions?
Light reactions occur when plants synthesize food from carbon dioxide and water, referring specifically to the part of energy production that requires light and water to generate electrons needed for further synthesis. Water provides the electrons by splitting into hydrogen and oxygen atoms.
What happens during the electron transport chain?
In the electron transport chain, electrons are passed from one molecule to another, and energy released in these electron transfers is used to form an electrochemical gradient. In chemiosmosis, the energy stored in the gradient is used to make ATP.
What happens during the light reactions?
During the light-dependent stage (“light” reactions), chlorophyll absorbs light energy, which excites some electrons in the pigment molecules to higher energy levels; these leave the chlorophyll and pass along a series of molecules, generating formation of NADPH (an enzyme) and high-energy ATP molecules.
What does the electron transport chain do?
The electron transport chain is a series of four protein complexes that couple redox reactions, creating an electrochemical gradient that leads to the creation of ATP in a complete system named oxidative phosphorylation. It occurs in mitochondria in both cellular respiration and photosynthesis.
What happens along an electron transport chain?