AP Biology Assistance » Cellular Biology » Cell Functions » Cellular Respiration » Understanding the Electron Transport Chain
Explanation:

In cellular respiration, oxygen is the last electron acceptor. Oxygen accepts the electrons after they have actually passed via the electron transfer chain and also ATPase, the enzyme responsible for producing high-energy ATP molecules. Just remember cellular respiration—respiration suggests breapoint, and you cannot breathe without oxygen.

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Which of the following molecules is the last electron acceptor in the electron deliver chain during cellular respiration?


Explanation:

Oxygen is the last electron acceptor in the electron transport chain, showing the require for aerobic conditions to undergo such a process. ATP is created as a product of the electron transport chain, while glucose and also CO2 play a role in earlier procedures of cellular respiration.


How many kind of potential ATP can be produced when one molecule of glyceraldehyde-3-phosphate is put through glycolysis?


Explanation:

Glyceraldehyde-3-phosphate is converted to 1,3-bisphosphoglycerate, and also one NADH is also produced during that action. NADH enters the electron move chain, and is therefore worth ATP. Normally, an NADH is worth about 2.5 ATP; yet, an NADH produced in glycolysis is just worth 1.5 ATP because it expenses 1 ATP to move that NADH from the cytoplasm right into the mitochondria. So, in this first action, we have actually a total of 1.5 ATP.

As the molecule proceeds on its course to come to be pyruvate, it will also produce 2 ATP directly; therefore, we have actually a net complete of 3.5 potential ATP.


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Example Inquiry #1 : Understanding The Electron Transport Chain


What happens to the electron deliver chain once oxygen is not available?


Possible Answers:

Oxidative phosphorylation will develop oxygen from obtainable carbon dioxide


Oxidative phosphorylation will certainly make use of carbon dioxide rather of oxygen


Oxidative phosphorylation can continue without any kind of noticeable impact


Oxidative phosphorylation ceases and also the cell reverts to fermentation after glycolysis


Oxidative phosphorylation uses different fuel sources, such as fats


Correct answer:

Oxidative phosphorylation ceases and also the cell reverts to fermentation after glycolysis


Explanation:

Oxygen is the last electron acceptor in the electron transfer chain, which permits for oxidative phosphorylation. Without oxygen, the electrons will be backed up, ultimately resulting in the electron move chain to halt. This will certainly reason the commodities of glycolysis to go with fermentation instead of going to the citric acid cycle. Without oxygen, oxidative phosphorylation (the electron transport chain) is difficult, but substrate-level phosphorylation (glycolysis) proceeds.


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Example Concern #1 : Understanding The Electron Transport Chain


Most of the ATP produced in cellular respiration originates from which of the following processes?


Possible Answers:

Glycolysis


Substrate-level phosphorylation


Krebs cycle


Oxidative phosphorylation


Citric acid cycle


Correct answer:

Oxidative phosphorylation


Explanation:

Cellular respiration generally adheres to three measures, under aerobic problems. Glycolysis generates NADH and converts glucose to pyruvate, while developing tiny amounts of ATP with substrate-level phosphorylation. The citric acids cycle, or Krebs cycle, offers pyruvate to geneprice even more NADH and also FADH2. These NADH and FADH2 molecules donate electrons to the electron carry chain, which are used to pump protons right into the intermembrane space of the mitochondrion. The protons in the intermembrane area then circulation with ATP synthase to generate big quantities of ATP using oxidative phosphorylation.


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Example Question #2 : Understanding The Electron Transport Chain


Why is oxygen crucial for the electron move chain?


Possible Answers:

It is crucial for carrying pyruvate into the mitochondria


It is part of the chemiosmotic gradient


It serves as the main electron donor


It serves as the terminal electron acceptor


Correct answer:

It serves as the terminal electron acceptor


Explanation:

Oxygen serves as the terminal electron acceptor for the electron carry chain. Electrons are donated by NADH molecules and passed through a number of different proteins to generate the proton gradient in the intermembrane room. Upon reaching the last protein, the electron is bonded to an oxygen molecule to produce water. Without oxygen, tright here would certainly be nowright here for the electrons to pursue being pumped through the electron deliver chain, and also aerobic cellular respiration would be impossible.


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Example Inquiry #85 : Cellular Respiration


Which of the adhering to processes requires an electron acceptor?


Possible Answers:

The electron deliver chain calls for an oxygen electron acceptor


Glycolysis needs a nitrogen electron acceptor


The citric acid cycle requires an oxygen electron acceptor


The electron deliver chain needs a nitrogen electron acceptor


Correct answer:

The electron carry chain needs an oxygen electron acceptor


Explanation:

Oxygen acts as the terminal electron acceptor in the electron carry chain (ETC). This accounts for the factor as to why, once cells are starved of oxygen, the ETC "backs up" and also the cell will divert to making use of anaerobic respiration, such as fermentation. At the end of the electron move chain, the electron and a proton are passed to an oxygen molecule to develop water.

The citric acid cycle relies on oxygen in an instraight feeling. The primary objective of the cycle is to develop electron donors for the electron transport chain. If the chain is not functional (as a result of absence of oxygen), the citric acid cycle also stops functioning. Glycolysis is not dependent on oxygen, and also can feature in anaerobic atmospheres.


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Example Question #1 : Understanding The Electron Transport Chain


The chemical compound 2,4-dinitrophenol have the right to disrupt the process of oxidative phosphorylation in the mitchondrial electron move chain by resulting in which effect?


Possible Answers:

Binding to nucleotide carriers


Binding to ubiquinone


Oxidative inhibition


Removing the F0 subunit from the ATP synthase complex


Dispersion of the proton gradient


Correct answer:

Dispersion of the proton gradient


Explanation:

In ATP synthesis, the proton gradient is an interconvertible create of power in electron transfer. 2,4-dinitrophenol is an inhibitor of ATP manufacturing in cells via mitochondria. Its mechanism of action entails transporting prolots throughout the mitochondrial membrane, which leads to the consumption of energy without ATP production.

The other answer selections are not straight pertained to the generation of the proton gradient.


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Example Inquiry #3 : Understanding The Electron Transport Chain


If cellular respiration were 100% efficient, the process must produce about eighty ATP, but, the actual yield is around thirty ATP. What happens to the rest of the chemical power in glucose?


Possible Answers:

It is used to make water from hydrogen ions and also oxygen


It is converted to heat


It is released as carbon dioxide and water


It is converted to starch


It is stored as fat


Correct answer:

It is converted to heat


Explanation:

Cellular respiration is just about 38% efficient, with the remainder of the power in glucose lost as warm.

Water and also carbon dioxide are not offered to keep energy. Fats deserve to be synthesized from acetyl CoA and also glycerol, but are not primarily created in huge amounts in the time of cellular respiration. Starcs are mainly supplied for energy storage in plants, but deserve to be synthesized from glucose; but, starches are not a typical product of cellular respiration.

Most of the reactions in cellular respiration are exothermic, in order to support spontaneous reactivity. The outcome is release of warmth power with the majority of measures.


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Example Inquiry #1 : Understanding The Electron Transport Chain


Alengthy what structure carry out electrons in the electron carry chain (ETC) move?


Possible Answers:

The outer membrane of the mitochondria


The mitochondrial matrix


The inner membrane of the mitochondria


The cytoplasm


Correct answer:

The inner membrane of the mitochondria


Explanation:

The occasions of the electron transport chain take place on the inner membrane of the mitochondria. The transmembrane proteins provided to shuttle electrons via the electron carry chain are embedded on the inner membrane. Electrons are donated to these proteins and provided to transport proloads into the intermembrane room from the matrix. After reaching the last inner membrane protein in the chain, the electron is transferred to oxygen to form water.

The mitochondrial matrix is wbelow the ATP ultimately is inevitably synthesized, as well as the website of the citric acid cycle. The cytoplasm is the website of glycolysis. The outer mitochondrial membrane is not straight involved in cellular respiration.

See more: How Long Can Uncooked Bacon Sit Out, Can Cooked Bacon Sit Out Overnight


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