What is the initial source of electrons at the start of the electron flow?

What is the initial source of electrons for the chloroplast electron transport chain? Water is the initial source. The reaction center contains a pair of chlorophyll a molecules with a special property.

What is the initial source of electron transport chain?

What is the initial source of electrons for the chloroplast electron transport chain? The reaction center contains a pair of chlorophyll a molecules with a special property. Those two chlorophylls can undergo oxidation upon excitation; they can actually give up an electron in a process called a photoact.

What is the initial source for photosynthesis?

Photosynthesis requires sunlight, carbon dioxide, and water as starting reactants (Figure 5.5). After the process is complete, photosynthesis releases oxygen and produces carbohydrate molecules, most commonly glucose. These sugar molecules contain the energy that living things need to survive.

What is the primary electron source for the light reactions?

The light-dependent reactions involve two photosytems (II and I) and an electron transport chain that are all embedded in the thylakoid membrane. Light that is harvested from PSII causes an excited electron of the chlorophyll a special pair to be passed down an electron transport chain (Pq, Cyt, and Pc) to PSI.

Where do the electrons originally come from in photosynthesis?

In photosynthesis, water is the source of electrons and their final destination is NADP+ to make NADPH.

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.

What is the order of flow of the electron in the light reactions?

So, the correct answer is 'PSII, plastoquinone, cytochromes, PSI, ferredoxin'.

What is the source of energy that excites the electron in photosystem two?

Excited by light energy, the pair of chlorophylls donates an electron to the primary electron acceptor, which passes an electron to an electron transport chain.

What is the source of electrons for the chloroplast electron transport chain quizlet?

Figure 8.16: What is the source of electrons for the chloroplast electron transport chain? Water, Oxygen, Carbon Dioxide, or NADPH.

What are the stages of photosynthesis in order?

Photosynthesis takes place in two sequential stages:

• The light-dependent reactions;
• The light-independent reactions, or Calvin Cycle.

What are the 6 steps of photosynthesis?

What are the 6 steps of photosynthesis?

• Step 1-Light Dependent. CO2 and H2O enter the leaf.
• Step 2- Light Dependent. Light hits the pigment in the membrane of a thylakoid, splitting the H2O into O2.
• Step 3- Light Dependent. ...
• Step 4-Light Dependent.
• Step 5-Light independent.
• Step 6-Light independent.
• calvin cycle.

What molecule is the source of the electrons in the electron transport chain?

All of the electrons that enter the transport chain come from NADH and FADH 2​start subscript, 2, end subscript molecules produced during earlier stages of cellular respiration: glycolysis, pyruvate oxidation, and the citric acid cycle.

What are the steps of electron transport chain?

1. Step 1: Generating a Proton Motive Force.
2. Step Two: ATP Synthesis via Chemiosmosis.
3. Step Three: Reduction of Oxygen.
4. Summary: Oxidative Phosphorylation.

What is the source of energy for electron transport in the mitochondria?

Summary. Electron transport is the final stage of aerobic respiration. In this stage, energy from NADH and FADH₂ is transferred to ATP. During electron transport, energy is used to pump hydrogen ions across the mitochondrial inner membrane, from the matrix into the intermembrane space.

Where do electrons get their energy in photosystem?

Answer and Explanation: Electrons in Photosystem I gain their energy when chlorophyll or carotenoid molecules absorb light and get into a photoexcited state.

What are photosystem 1 and 2?

Photosystem I and photosystem II are the two multi-protein complexes that contain the pigments necessary to harvest photons and use light energy to catalyse the primary photosynthetic endergonic reactions producing high energy compounds.

Where do the electrons come from in glycolysis?

As in aerobic respiration, Glycolysis also delivers high-energy electrons taken from glucose to electron carriers. In order for glycolysis to occur, that is in order to split a molecule of glucose into 2 molecules of pyruvate, some electrons must be removed from glucose.

How do electrons enter the electron transport chain quizlet?

All of the electrons that enter the transport chain come from NADH and FADH2 molecules produced during earlier stages of cellular respiration: glycolysis, pyruvate oxidation, and the citric acid cycle.

What is the first electron acceptor in cellular respiration?

Explanation: Oxygen serves as the terminal electron acceptor for the electron transport chain. Electrons are donated by NADH molecules and passed through several different proteins to generate the proton gradient in the intermembrane space.

What is the final electron acceptor in electron transport chain?

Oxygen is the terminal electron acceptor in the mitochondrial electron transport chain and therefore is required for the generation of energy through oxidative phosphorylation.

What is the correct order of the stages of cellular respiration quizlet?

The reactions of cellular respiration can be grouped into three stages: glycolysis, the Krebs Cycle, and electron transport.

What is the first step of photosynthesis quizlet?

The first stage of photosynthesis is called the light reactions. During this stage, light is absorbed and transformed to chemical energy in the bonds of NADPH and ATP.

Which step is the beginning of photosynthesis quizlet?

The first step in photosynthesis is the absorption of light. Plants have special organelles to capture light energy called chloroplasts.