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Asked by: Marcel Spinka
Updated: 12 October 2021 03:14:00 AM

Krebs cycle takes place in what part of the cell?

Fuel for the Krebs cycle comes from lipids (fats) and carbohydrates, which both produce the molecule acetyl coenzyme-A (acetyl-CoA). This acetyl-CoA reacts in the first step of the eight step sequence of reactions that comprise the Krebs cycle, all of which occur inside mitochondria of eukaryotic cells.

Bearing this in mind where does the Kreb cycle happen in the mitochondria?

In eukaryotes, the Krebs cycle reactions take place in the mitochondrial matrix, a dense solution that surrounds the mitochondria crests: in addition to water, the matrix contains all the enzymes necessary for the biochemical reactions of the cycle, coenzymes, and phosphates.

Adding to that, what is the main function of the ETC?

Explanation: The electron transport chain is primarily used to send protons across the membrane into the intermembrane space. This create a proton-motive force, which will drive ATP synthase in the final step of cellular respiration to create ATP from ADP and a phosphate group.

Correspondingly what is the relationship between ETC and oxygen?

Explanation: Oxygen acts as the terminal electron acceptor in the electron transport chain (ETC). This accounts for the reason as to why, when cells are starved of oxygen, the ETC "backs up" and the cell will divert to using anaerobic respiration, such as fermentation.
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Related questions and answers

What process requires oxygen?

Aerobic Metabolism Any metabolic process that requires oxygen to occur is referred to as aerobic. Humans, most other multicellular organisms, and some microorganisms require oxygen for the efficient capture of the chemical energy from food and its transformation into the cellular energy form known as ATP.

What happens to pyruvate if oxygen is present?

In the presence of oxygen, pyruvate is converted to acetyl-CoA and then enters the citric acid cycle. More ATP can be formed from the breakdown of glucose when oxygen is present.

What happens if oxygen is not present to capture electrons?

If oxygen isn't there to accept electrons (for instance, because a person is not breathing in enough oxygen), the electron transport chain will stop running, and ATP will no longer be produced by chemiosmosis.

What is the end product of glycolysis when oxygen is not present?

Glycolysis Overview Glycolysis is a linear metabolic pathway of enzyme-catalyzed reactions that convert glucose into two molecules of pyruvate in the presence of oxygen or into two molecules of lactate in the absence of oxygen.

What is process of respiration?

Respiration is the biochemical process in which the cells of an organism obtain energy by combining oxygen and glucose, resulting in the release of carbon dioxide, water, and ATP (the currency of energy in cells). Note the number of oxygen, carbon dioxide, and water molecules involved in each 'turn' of the process.

What are the 4 steps in respiration?

There are four stages: glycolysis, the link reaction, the Krebs cycle and oxidative phosphorylation.

What are the 3 steps in respiration?

Summary: the three stages of Aerobic Respiration Carbohydrates are broken down using all three stages of respiration (glycolysis, citric acid cycle and the electron transport chain).

What type of acid is created in glycolysis?

Pyruvic acid can be made from glucose through glycolysis, converted back to carbohydrates (such as glucose) via gluconeogenesis, or to fatty acids through acetyl-CoA.

What happens to glycolysis when no oxygen is present?

When oxygen is not present, pyruvate will undergo a process called fermentation. In the process of fermentation the NADH + H+ from glycolysis will be recycled back to NAD+ so that glycolysis can continue. In the process of glycolysis, NAD+ is reduced to form NADH + H+. One type of fermentation is alcohol fermentation.

What happens after glycolysis if oxygen is present?

If oxygen is present, pyruvate from glycolysis is sent to the mitochondria. The pyruvate is transported across the two mitochondrial membranes to the space inside, which is called the mitochondrial matrix. There it is converted to many different carbohydrates by a series of enzymes.

What happens during ETC?

The electron transport chain is a series of electron transporters embedded in the inner mitochondrial membrane that shuttles electrons from NADH and FADH2 to molecular oxygen. In the process, protons are pumped from the mitochondrial matrix to the intermembrane space, and oxygen is reduced to form water.

What is the role of ETC?

The electron transport chain (ETC; respiratory chain) is a series of protein complexes that transfer electrons from electron donors to electron acceptors via redox reactions (both reduction and oxidation occurring simultaneously) and couples this electron transfer with the transfer of protons (H+ ions) across a

What is the main purpose of ETC?

What is the purpose of the ETC? The main purpose of the electron transport chain is to build up a surplus of hydrogen ions (protons) in the intermembrane space sp that there will be a concentration gradient compared to the matrix of the mitochondria. This will drive ATP synthase.

What happens after glycolysis if no oxygen is present?

Review: In the process of glycolysis, a net profit of two ATP was produced, two NAD+ were reduced to two NADH + H+, and glucose was split into two pyruvate molecules. When oxygen is not present, pyruvate will undergo a process called fermentation.

Is a process that doesn't require oxygen?

Glycolysis (see "Glycolysis" concept) is an anaerobic process - it does not need oxygen to proceed. They follow glycolysis with the Krebs cycle and electron transport to make more ATP than by glycolysis alone. Cellular respiration that proceeds in the presence of oxygen is called aerobic respiration.

What is respiration process?

“Respiration is defined as a metabolic process wherein, the living cells of an organism obtains energy (in the form of ATP) by taking in oxygen and liberating carbon dioxide from the oxidation of complex organic substances.”

What process does not require oxygen?

Glycolysis, which is the first step in all types of cellular respiration is anaerobic and does not require oxygen.

What occurs after glycolysis when oxygen is not present?

When oxygen is not present, pyruvate will undergo a process called fermentation. In the process of fermentation the NADH + H+ from glycolysis will be recycled back to NAD+ so that glycolysis can continue. Fermentation does not require oxygen and is therefore anaerobic.

What kind of environment where oxygen is not used?

Anaerobic respiration is a type of respiration where oxygen is not used; instead, organic or inorganic molecules are used as final electron acceptors.

What makes up ETC?

The electron transport chain is composed of four protein complexes, which are embedded in the inner membrane of the mitochondrion, along with two mobile carriers (mobile carrier Q {coenzyme Q} and mobile carrier C, that shuttle electrons through the ETC. The ETC is where the greatest amount of ATP is synthesized.