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What Is Aerobic Respiration In Biology

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In Summary: Citric Acid Cycle

What Is Aerobic Respiration? | Physiology | Biology | FuseSchool

The citric acid cycle is a series of redox and decarboxylation reactions that remove high-energy electrons and carbon dioxide. The electrons temporarily stored in molecules of NADH and FADH2 are used to generate ATP in a subsequent pathway. One molecule of either GTP or ATP is produced by substrate-level phosphorylation on each turn of the cycle. There is no comparison of the cyclic pathway with a linear one.

Products Of The Citric Acid Cycle

Two carbon atoms come into the citric acid cycle from each acetyl group, representing four out of the six carbons of one glucose molecule. Two carbon dioxide molecules are released on each turn of the cycle however, these do not necessarily contain the most recently added carbon atoms. The two acetyl carbon atoms will eventually be released on later turns of the cycle thus, all six carbon atoms from the original glucose molecule are eventually incorporated into carbon dioxide. Each turn of the cycle forms three NADH molecules and one FADH2 molecule. These carriers will connect with the last portion of aerobic respiration to produce ATP molecules. One GTP or ATP is also made in each cycle. Several of the intermediate compounds in the citric acid cycle can be used in synthesizing non-essential amino acids therefore, the cycle is amphibolic .

Aerobic Respiration Part : Glycolysis

You have read that nearly all of the energy used by living things comes to them in the bonds of the sugar, glucose. Glycolysis is the first step in the breakdown of glucose to extract energy for cell metabolism. Many living organisms carry out glycolysis as part of their metabolism. Glycolysis takes place in the cytoplasm of most prokaryotic and all eukaryotic cells.

Glycolysis begins with a molecule of glucose . Various enzymes are used to break glucose down into two molecules of pyruvate . This process releases a small amount of energy.

Figure 1

Glycolysis consists of two distinct phases: energy-requiring, and energy-producing.

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In Summary: Pyruvate Oxidation

In the presence of oxygen, pyruvate is transformed into an acetyl group attached to a carrier molecule of coenzyme A. The resulting acetyl CoA can enter several pathways, but most often, the acetyl group is delivered to the citric acid cycle for further catabolism. During the conversion of pyruvate into the acetyl group, a molecule of carbon dioxide and two high-energy electrons are removed. The carbon dioxide accounts for two of the six carbons of the original glucose molecule. The electrons are picked up by NAD+, and the NADH carries the electrons to a later pathway for ATP production. At this point, the glucose molecule that originally entered cellular respiration has been completely oxidized. Chemical potential energy stored within the glucose molecule has been transferred to electron carriers or has been used to synthesize a few ATPs.

Process That Releases Energy By Breaking Down Glucose And Other Food Molecules In The Presence Of Oxygen

Cellular respiration

What is required for aerobic cellular respiration to occur. These are cells that contain a nucleus brain of the cell and organelles little organs that each have their own job inside the. Respiration that does not require oxygen. In this process water and carbon dioxide are produced as end products.

Cellular respiration is the process in which food molecules are used to produce cell energy. Cellular respiration occurs within the cytoplasm of prokaryotic cells but within the mitochondria of eukaryotic cells. What is the purpose of cellular respiration.

Now up your study game with Learn mode. Glycolysis occurs in the cytoplasm of the cell with the products of glycolysis entering the mitochondria to continue cellular respiration. Chapter 43 Cellular Respiratio.

It occurs because your cells dont have enough oxygen to do cellular respiration and they need to produce energy in some way so theyll produce it through fermentation lactic acid. It can be aerobic where oxygen is present or anaerobic where oxygen is absent and a sugar such as glucose is required to fuel the process. What is the 6 carbon molecule that is broken down to make ATP.

Aerobic respiration as the name suggests is the process of producing the energy required by cells using oxygen. Aerobic cellular respiration occurs mainly in eukaryotic cells. Therefore glucose is required for both aerobic and anaerobic respiration.

These aerobic phases are the Krebs Cycle and the electron transport chain.

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Aerobic Respiration: Definition Steps And Process

Organisms such as prokaryotes and eukaryotes use respiration mechanism for the break down of food that may require environmental oxygen. The process by which mitochondria use to transfer the energy in foods to ATP is known as cellular respiration. In this process, food molecule breaks down in mitochondria, may consume oxygen and transfer energy to cells and the environment .

There are two types of cellular respiration – they are aerobic respiration and anaerobic respiration. The cells of animals, plants, and many bacteria need oxygen to facilitate energy transfer during cellular respiration. In these organisms, the type of cellular respiration takes place is called aerobic respiration. In aerobic respiration, ATP forms as electrons are harvested and transferred along the electron transport chain, and eventually donated to oxygen gas. Many eukaryotes produce the majority of their ATP from glucose molecule in this manner. The meaning of word aerobic is with air. Aerobic respiration is thought to have evolved as a modification of the basic photosynthetic machinery. The oxidation of glucose by aerobic respiration in eukaryotes produces up to three dozen of ATP molecules. On the other hand, in the case of anaerobic respiration, the organisms do not require oxygen for the cellular respiration. Alcohol fermentation, lactic acid fermentation etc. are examples of anaerobic respiration.

Here are some basic points that discuss cellular respiration:

What Is The Major Difference Between Aerobic And Anaerobic Processes

Aerobic respiration is a fixed metabolic reaction that takes place in the presence of oxygen, going on in a cellular to transform chemical energy into ATPs. Anaerobic respiration is a process of cellular respiration in which the excessive energy electron acceptor is neither oxygen nor pyruvate derivatives.

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Is Glycolysis An Aerobic Process

Glycolysis is the major pathway of glucose metabolism and occurs in the cytosol of all cells. It can occur aerobically or anaerobically depending on whether oxygen is available. This is clinically significant because oxidation of glucose under aerobic conditions results in 32 mol of ATP per mol of glucose.

The Importance Of Energy

Aerobic Respiration – What is Aerobic Respiration? – 9-1 GCSE Biology

The world’s main source of energy is the sun. Humans don’t need direct sunlight to survive, but if we had no sunlight, there would be no life forms. Plants use sunlight to create their own food through photosynthesis, and are then eaten by animals who take that energy into their own bodies. Other animals then eat the plant-eating animals, passing the energy from one living thing to the next.

All forms of life need energy, from humans and animals to plants, fungi and algae. Energy released during respiration is used in several ways. For example, it may be used to create larger molecules from smaller ones, such as when plants make amino acids from sugars, nitrates and other nutrients, which are then used to make proteins.

Animals and humans use energy to contract their muscles to allow them to move. Energy also helps to maintain a steady body temperature.

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Identify The Reactants And Products Of Cellular Respiration And Where These Reactions Occur In A Cell

Now that weve learned how autotrophs like plants convert sunlight to sugars, lets take a look at how all eukaryoteswhich includes humans!make use of those sugars.

In the process of photosynthesis, plants and other photosynthetic producers create glucose, which stores energy in its chemical bonds. Then, both plants and consumers, such as animals, undergo a series of metabolic pathwayscollectively called cellular respiration. Cellular respiration extracts the energy from the bonds in glucose and converts it into a form that all living things can use.

What Is Aerobic Pathway

The aerobic pathway is also known as the Krebs citric acid cycle and the cytochrome chain. In these two steps the by-products of the initial anaerobic glycolysis step are oxidized to produce carbon dioxide, water, and many energy-rich ATP molecules. All together, all these steps are referred to as cell respiration.

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Aerobic Cellular Respiration: 3 Importance Stages Of Aerobic Respiration

Some of the importance stages of aerobic respiration are as follows:

Glycolysis Krebs Cycle Electron Transport Chain.

Aerobic Respiration is the process by which the energy from glucose is released in the presence of oxygen. It takes place only if oxygen is available.

For instance, if glucose were oxidized, the result would be energy, carbon dioxide and water. Take a look at the chemical formula given below.

C6H12O6+ 6O2 = 6CO2 + 6H2O + Energy

In simple words, Glucose + Oxygen = Carbon dioxide + Water + Energy

In brief, aerobic respiration helps in release of maximum energy and also gets rid of carbon dioxide and excess water.

There are three stages of aerobic respiration as given below:


Glycolysis takes place in the cytosol of the cell where in glucose is partially oxidized and is broken down into 3 carbon molecules of private. This process of glycolysis produces energy 2 ATP molecules and 2 NADH molecules. Each NADH molecule carries 2 energy electrons. The cells later use these electrons.

Krebs Cycle:

This is the next stage of aerobic cellular respiratory. In Krebs cycle, private molecules are processed to release the energy that is stored between their molecular bonds. The energy is released in the form of ATP. This cycle is also called as the citric acid cycle.

Electron Transport Chain:

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What Is Aerobic Process In Biology


An aerobic process refers to a process that requires the presence of oxygen or air as opposed to an anaerobic process that does not require it. Conversely, cellular respiration takes place in other organisms that make use of other molecules as electron acceptor rather than oxygen.

What are some examples of aerobic processes?

  • Swimming.
  • Walking.
  • Rowing.
  • Using an upper body ergometer .

What 2 processes are aerobic? Aerobic respiration, a process that uses oxygen, and anaerobic respiration, a process that doesnt use oxygen, are two forms of cellular respiration. Although some cells may engage in just one type of respiration, most cells use both types, depending on an organisms needs.

What is an aerobic or anaerobic process?

The Presence of Oxygen There are two types of cellular respiration: aerobic and anaerobic. One occurs in the presence of oxygen , and one occurs in the absence of oxygen . Both begin with glycolysis the splitting of glucose. Glycolysis is an anaerobic process it does not need oxygen to proceed.

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In Summary: Electron Transport Chain

The electron transport chain is the portion of aerobic respiration that uses free oxygen as the final electron acceptor of the electrons removed from the intermediate compounds in glucose catabolism. The electron transport chain is composed of four large, multiprotein complexes embedded in the inner mitochondrial membrane and two small diffusible electron carriers shuttling electrons between them. The electrons are passed through a series of redox reactions, with a small amount of free energy used at three points to transport hydrogen ions across a membrane. This process contributes to the gradient used in chemiosmosis. The electrons passing through the electron transport chain gradually lose energy, High-energy electrons donated to the chain by either NADH or FADH2 complete the chain, as low-energy electrons reduce oxygen molecules and form water. The level of free energy of the electrons drops from about 60 kcal/mol in NADH or 45 kcal/mol in FADH2 to about 0 kcal/mol in water. 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. These same molecules can serve as energy sources for the glucose pathways.

Aerobic Cellular Respiration Process

Aerobic respiration is a series of reactions in which energy is released from glucose. Glucose and oxygen are used up and carbon dioxide is produced as waste. The cells of humans, animals and plants go through this process constantly, even when at rest. Most of the reactions take place within mitochondria, which are tiny objects inside the cell’s cytoplasm.

In plants, the process of using light energy from the sun to convert carbon dioxide and water into food is called photosynthesis. This happens in two phases. First, the compartments in the plant’s cells called chloroplasts capture sunlight and store its energy in a chemical called ATP. Next, the ATP creates sugar and organic compounds, the foods plants need to live and grow. The first phase needs sunlight, but the second phases can happen without sunlight even at night.

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Biology I Laboratory Manual

At the conclusion of the lab, the student should be able to:

  • define the following terms: fermentation, anaerobic respiration, germination, aerobic respiration
  • list the organelle in eukaryotic cells responsible for generating the greatest number of ATP molecules during aerobic respiration
  • list 2 examples of fermentation pathways
  • give the reactants and products for the overall equation of anaerobic fermentation
  • give the reactants and products for the overall equation of aerobic cellular respiration
  • explain the fundamental differences between fermentation and cellular respiration
  • explain why we used an increase in carbon dioxide concentrations to indicate cellular respiration took place

Things you should be able to explain to someone else after this lab:

  • Aerobic respiration

Respiration lab Biology ILumen Learning

What Is Anaerobic Respiration

Aerobic Respiration – GCSE Biology (9-1)

Anaerobic means without air. Therefore, this type of cellular respiration does not use oxygen to produce energy. Sometimes there is not enough oxygen around for some organisms to respire, but they still need the energy to survive. Due to lack of oxygen, they carry out respiration in the absence of oxygen to produce the energy they require, which is referred to as anaerobic respiration. Anaerobic respiration usually occurs in lower plants and microorganisms. In the absence of oxygen, the glucose derived from food is broken down into alcohol and carbon dioxide along with the production of energy.

Further Reading:Fermentation: Anaerobic Respiration

Glucose Alcohol + Carbon dioxide + Energy

Anaerobic respiration is also used by multi-cellular organisms, like us, as a temporary response to oxygen-less conditions. During heavy or intensive exercise such as running, sprinting, cycling or weight lifting, our body demands high energy. As the supply of oxygen is limited, the muscle cells inside our body resort to anaerobic respiration to fulfil the energy demand.

Glucose Lactic acid + Energy

Anaerobic respiration produces a relatively lesser amount of energy as compared to aerobic respiration, as glucose is not completely broken down in the absence of oxygen.

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Importance Of Aerobic Cellular Respiration

Aerobic cellular respiration is the process by which the cells of a living organism break down food and turn it into the energy they need to perform their essential functions. The importance of aerobic respiration in living things cannot be underestimated. Without this process, no living thing would survive.

What Is Aerobic Respiration Definition Diagram And Steps

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Efficiency Of Atp Production

The table below describes the reactions involved when one glucose molecule is fully oxidized into carbon dioxide. It is assumed that all the reducedcoenzymes are oxidized by the electron transport chain and used for oxidative phosphorylation.

Total yield 30 or 32 ATP From the complete oxidation of one glucose molecule to carbon dioxide and oxidation of all the reduced coenzymes.

Although there is a theoretical yield of 38 ATP molecules per glucose during cellular respiration, such conditions are generally not realized because of losses such as the cost of moving pyruvate , phosphate, and ADP into the mitochondria. All are actively transported using carriers that utilize the stored energy in the proton electrochemical gradient.

  • Pyruvate is taken up by a specific, low Km transporter to bring it into the mitochondrial matrix for oxidation by the pyruvate dehydrogenase complex.
  • The phosphate carrier mediates the electroneutral exchange of phosphate for OHâ or symport of phosphate and protons across the inner membrane, and the driving force for moving phosphate ions into the mitochondria is the proton motive force.
  • The ATP-ADP translocase is an antiporter and exchanges ADP and ATP across the inner membrane. The driving force is due to the ATP having a more negative charge than the ADP , and thus it dissipates some of the electrical component of the proton electrochemical gradient.

S In The Citric Acid Cycle

Aerobic Respiration

Step 1. Prior to the start of the first step, pyruvate oxidation must occur. Then, the first step of the cycle begins: This is a condensation step, combining the two-carbon acetyl group with a four-carbon oxaloacetate molecule to form a six-carbon molecule of citrate. CoA is bound to a sulfhydryl group and diffuses away to eventually combine with another acetyl group. This step is irreversible because it is highly exergonic. The rate of this reaction is controlled by negative feedback and the amount of ATP available. If ATP levels increase, the rate of this reaction decreases. If ATP is in short supply, the rate increases.

Step 2. In step two, citrate loses one water molecule and gains another as citrate is converted into its isomer, isocitrate.

Step 3. In step three, isocitrate is oxidized, producing a five-carbon molecule, -ketoglutarate, together with a molecule of CO2 and two electrons, which reduce NAD+ to NADH. This step is also regulated by negative feedback from ATP and NADH, and a positive effect of ADP.

Steps 3 and 4. Steps three and four are both oxidation and decarboxylation steps, which release electrons that reduce NAD+ to NADH and release carboxyl groups that form CO2 molecules. -Ketoglutarate is the product of step three, and a succinyl group is the product of step four. CoA binds the succinyl group to form succinyl CoA. The enzyme that catalyzes step four is regulated by feedback inhibition of ATP, succinyl CoA, and NADH.

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