Quick Answer: Is Coenzyme A An Electron Carrier?

What are examples of electron carriers?

Cytochromes and quinones (such as coenzyme Q) are some examples of electron carriers..

Which electron carriers are common for both photosynthesis and respiration?

Cytochromes are membrane-bound hemeproteins containing heme groups and are primarily responsible for the generation of ATP via electron transport. It is common in both photosynthesis as well as respiration.

How many co2 does pyruvate oxidation produce?

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.

Does glycolysis produce co2?

Glycolysis is the first step in which glucose is broken down into pyruvate. The process results in energy carrying molecules called NADH. A small amount of ATP is also made and CO2 is given off as a byproduct. Glycolysis occurs in the cytoplasm of the cell.

Is NADP+ an electron carrier?

The electron acceptor of the light reactions, NADP+, is first cousin to NAD’, which functions as an electron carrier in cellular respiration; the two molecules differ only by the presence of an extra phosphate group in the NADP+ molecule.

Is H+ an electron acceptor?

Oxygen is an oxidizing agent (electron acceptor) and hydrogen is a reducing agent (electron donor).

Is NADH an electron donor?

NADH is a strong electron donor: because its electrons are held in a high-energy linkage, the free-energy change for passing its electrons to many other molecules is favorable (see Figure 14-9).

What is the difference between Photophosphorylation and oxidative phosphorylation?

Oxidative phosphorylation involves the reduction of O2 to H2O with electrons donated by NADH and FADH2, and occurs equally well in light or darkness. Photophosphorylation involves the oxidation of H2O to O2, with NADP+ as electron acceptor, and it is absolutely dependent on light.

How do electrons flow during photosynthesis?

The pathway of electron flow starts at photosystem II, which is homologous to the photosynthetic reaction center of R. … Plastoquinone carries electrons from photosystem II to the cytochrome bf complex, within which electrons are transferred to plastocyanin and additional protons are pumped into the thylakoid lumen.

What are two electron carriers?

In cellular respiration, there are two important electron carriers, nicotinamide adenine dinucleotide (abbreviated as NAD+ in its oxidized form) and flavin adenine dinucleotide (abbreviated as FAD in its oxidized form).

How many electrons can FAD carry?

two electronsNADH-CoQ Reductase Complex FMN, like FAD, can accept two electrons, but does so one electron at a time (see Figure 16-8).

What are the 3 electron carriers?

Oxidation-reduction reactions always happen in matched pairs; no molecule can be oxidized unless another is reduced.Flavin Adenine Dinucleotide. Flavin adenine dinucleotide, or FAD, consists of riboflavin attached to an adenosine diphosphate molecule. … Nicotinamide Adenine Dinucleotide. … Coenzyme Q. … Cytochrome C.

What is an electron carrier in photosynthesis?

Electron carrier molecules are arranged in electron transport chains that produce ATP and NADPH, which temporarily store chemical energy. The light reactions capture energy from sunlight, which they change to chemical energy that is stored in molecules of NADPH and ATP.

Which molecule is responsible for acting as an electron carrier?

Nicotinamide adenine dinucleotide, a coenzyme that cycles easily between oxidized (NAD+) and reduced (NADH) states, thus acting as an electron carrier.

Is pyruvate an electron carrier?

NADH is oxidized to NAD+ and pyruvate is reduced to lactate. … In fermentation, the final electron acceptor is pyruvate (lactic acid fermentation), acetaldehyde (alcohol fermentation), or some other organic molecule. In cellular respiration, the final electron acceptor is oxygen.

What are the 2 electron carriers 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.

What is the function of electron carriers?

Electron carriers, sometimes called electron shuttles, are small organic molecules that readily cycle between oxidized and reduced forms and are used to transport electrons during metabolic reactions.

What are the electron carriers in glycolysis?

Glycolysis – occurs in cytoplasm; splits glucose into two molecules of the three-carbon molecule pyruvate; transfers energy to produce two molecules of ATP and loads high energy electrons onto electron carriers (NADH).