Where Would You Expect To Find Electron Transport Chains In A Prokaryote

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Where Would You Expect To Find Electron Transport Chains In A Prokaryote?

In prokaryotes the electron transport chain components are found in the plasma membrane. As the electrons travel through the chain they go from a higher to a lower energy level moving from less electron-hungry to more electron-hungry molecules.

Where would you expect to find electron transport chains in a eukaryotic?

The electron transport chain is present in multiple copies in the inner mitochondrial membrane of eukaryotes and the plasma membrane of prokaryotes.

Why does FADH2 yield less ATP than NADH?

Correct answer: FADH2 produces less ATP then NADH because the electrons for FADH2 are dropped off at the second protein of the electron transport chain. … As a result the electrons from FADH2 do not pump as much electrons across the membrane as NADH.

NADH and FADH2 are both electron carriers that donate their electrons to the electron transport chain. The electrons ultimately reduce O2 to water in the final step of electron transport.

Which of the following can be used as a final electron acceptor for aerobic respiration quizlet?

Which of the following can be used as a final electron acceptor for aerobic respiration? – Nitrate ion sulfate ion and carbonate ion can all be used as a final electron acceptor.

Where does electron transport chain occur?

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.

Where does the electron transport chain occur in eukaryotic and prokaryotic cells?

In Eukaryotes it occurs in inner membrane of mitochondria while in prokaryotes it occurs in cell plasma membrane.

Why might some cells uncouple the electron transport chain?

Why might some cells uncouple the electron transport chain? Cells can use the energy from the proton gradient for functions other than producing ATP such as heat generation. … This causes the proton gradient to break down stopping ATP synthesis.

What happens to each pyruvate as it leaves the cytoplasm?

Pyruvate is produced by glycolysis in the cytoplasm but pyruvate oxidation takes place in the mitochondrial matrix (in eukaryotes). … A carboxyl group is removed from pyruvate and released as carbon dioxide. The two-carbon molecule from the first step is oxidized and NAD+ accepts the electrons to form NADH.

How is electron transport coupled to ATP synthesis?

The free energy derived from the passage of electrons through complexes I III and IV is harvested by being coupled to the synthesis of ATP. … Instead the energy derived from electron transport is coupled to the generation of a proton gradient across the inner mitochondrial membrane.

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. Here light energy drives the reduction of components of the electron transport chain and therefore causes subsequent synthesis of ATP.

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The reduced coenzymes generated by the citric acid cycle donate electrons in a series of reactions called the electron transport chain. The energy from the electron transport chain is used for oxidative phosphorylation.

In what order do electrons move through the electron transport chain?

The electrons must travel through special proteins stuck in the thylakoid membrane. They go through the first special protein (the photosystem II protein) and down the electron transport chain. Then they pass through a second special protein (photosystem I protein).

Which of the following does the electron transport chain use?

The Electron Transport Chain relies on the delivery of electrons from electron carriers. ATP is formed through the movement of protons down their gradient through a ATP synthase protein. The formation of the proton gradient is accomplished via a double membrane in the mitochondria.

Which of the following is the final electron acceptor in the electron transport chain of aerobic respiration?

Oxygen

Explanation: Oxygen is the final electron acceptor in the electron transport chain showing the need for aerobic conditions to undergo such a process. ATP is produced as a product of the electron transport chain while glucose and CO2 play a role in earlier processes of cellular respiration.

Which of the following is the final electron except are in the electron transport chain of aerobic respiration?

In aerobic respiration the final electron acceptor in the electron transport chain is oxygen.

Where does the electron transport chain take place quizlet?

The electron transport chain takes place within the inner membrane of the mitochondria.

Where does the electron transport chain take place within the mitochondria?

inner

Explanation: The mitochondrion has an outer membrane and an inner membrane with folds (cisternae). The electron transport chain is a series of transmembrane proteins found in the inner membrane.

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Where does electron transport occur during cellular respiration?

The Krebs cycle and electron transport occur in the mitochondria. The Krebs cycle takes place in the matrix and electron transport takes place on the inner membrane.

Where does the electron transport chain occur in prokaryotes quizlet?

*In prokaryotic cells the electron transport chain resides in the cytoplasmic membrane. Protons are pumped from inside the cell to the outside. See section 6.4 in the text for more information. from the mitochondrial matrix to the region between the inner and outer mitochondrial membranes (intermembrane space).

Where does the electron transport chain get the high energy electrons that are passed down the chain?

Where does the electron transport chain get the high-energy electrons that are passed down the chain? It gets the electrons from NADH and FADH2 which are produced in the Krebs cycle.

Where is the electron transport chain located in a bacterial cell?

plasma membrane

The electron transport chains of bacteria (prokaryotes) operate in plasma membrane (mitochondria are absent in prokaryotes).

What does it mean to uncouple electron transport and Chemiosmosis?

An uncoupler or uncoupling agent is a molecule that disrupts oxidative phosphorylation in prokaryotes and mitochondria or photophosphorylation in chloroplasts and cyanobacteria by dissociating the reactions of ATP synthesis from the electron transport chain.

How many electron transport chains are there in a mitochondria?

The respiratory chain of mammalian mitochondria is an assembly of more than 20 discrete carriers of electrons that are mainly grouped into several multi-polypeptide complexes (Figure 5.1). Three of these complexes (I III and IV) act as oxidation–reduction-driven proton pumps.

Where does pyruvate oxidation occur in prokaryotic cells?

In prokaryotes it happens in the cytoplasm. Overall pyruvate oxidation converts pyruvate—a three-carbon molecule—into acetyl CoAstart text C o A end text—a two-carbon molecule attached to Coenzyme A—producing an NADHstart text N A D H end text and releasing one carbon dioxide molecule in the process.

What is the final electron acceptor in the electron transport chain?

Oxygen

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

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How is pyruvate transported into the mitochondria this transport only happens when is present?

The transport of pyruvate into the mitochondria is via the transport protein pyruvate translocase. Pyruvate translocase transports pyruvate in a symport fashion with a proton and hence is active consuming energy.. … Upon entry to the mitochondria the pyruvate is decarboxylated producing acetyl-CoA.

Does the electron transport chain generate heat?

Because of this the electron transport chain can keep chugging away ATP levels do not build up there is no reduction in respiration rate and the excess energy not being used in ATP production is released as heat.

What happens in the electron transport chain of cellular respiration?

The electron transport chain is the last stage of the respiration pathway. It is the stage that produces the most ATP molecules. … The electrons transfer their energy to the proteins in the membrane providing the energy for hydrogen ions to be pumped across the inner mitochondrial membrane.

Where does the electron come from in photosynthesis?

In (a) photosystem II the electron comes from the splitting of water which releases oxygen as a waste product. In (b) photosystem I the electron comes from the chloroplast electron transport chain. The two photosystems absorb light energy through proteins containing pigments such as chlorophyll.

What is electron transport in photosynthesis?

Photosynthetic electron transport is the first stage of photosynthesis that produces chemically stored energy and uses solar photons to drive electron transport against a thermodynamic gradient.

Does photosynthesis have electron transport chain?

The photosynthetic electron transport chain consists of photosystem II the cytochrome b6f complex photosystem I and the free electron carriers plastoquinone and plastocyanin.

What reduced coenzymes provide the electrons for electron transport?

Reduced coenzymes include NADH FADH2 and coenzyme Q. Most organisms carry out aerobic respiration where oxygen is the final electron acceptor and water is the reduced form.

Which compounds are the final products of the electron transport chain and oxidative phosphorylation?

The end products of the electron transport chain are water and ATP. A number of intermediate compounds of the citric acid cycle can be diverted into the anabolism of other biochemical molecules such as nonessential amino acids sugars and lipids.

Prokaryotic electron transport chain

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