Glycolysis and Cellular Respiration - Class IX

Anaerobic process after glycolysis is called as fermentation. Fermentation could be defined as a metabolic process, that converts sugar into acids, gases and alcohol. It occurs in yeast and bacteria, but also in oxygen-starved muscle cells, as in the case of lactic acid fermentation.

Aerobic respiration is the oxidative breakdown of respiratory substrates with the help of atmospheric oxygen. It takes place in three steps: Glycolysis, Kreb's cycle and electron transport chain. Anaerobic respiration is the breakdown of respiratory substrates in the absence of atmospheric oxygen. The first step of aerobic respiration as well as anaerobic respiration is same and takes place in the cytoplasm of cells. Glycolysis is the common pathway of both the processes in which glucose is broken down anaerobically into two molecules of pyruvic acid. 

A) In fermentation, less than seven percent of the energy in glucose is released because only two ATPs are produced at this stage compared to the total number of 32 ATPs in aerobic respiration. The percentage of energy produced is thus (2/32)*100=6.25%.

If one triose phosphate completely oxidized inside the prokaryotic cell, then the net gain of ATP of energy is equal to the summation of the ATPs produced at different steps. In the glycolysis step 2 ATP and 1 NADH will be produced followed by 1 NADH in the gateway reaction and 1 GTP, 3 NADH and 1 FADH2 in the TCA cycle. This will add up to 20 ATPs.

Glycolysis is also known as 'EMP pathway'. It was discovered by three scientist Gustav Embden, Otto Meyerhof, and Jakub Karol Parnas. That's why glycolysis is also known as the EMP pathway. In the EMP pathway, total 8 ATP are produced.

Glycolysis is the only process of extraction of energy in anaerobic organisms. Thus, It never requires O$ _2$ for its completion. Since the process takes place solely in cytoplasm so never requires any other organelle for its completion. As ETS takes place in mitochondria so it never takes part in glycolysis. For uninterrupted working of glycolysis, we require NADP$^+$ as it is required for the production of NADP$^+$+H$^+$ during conversion of 3-Phosphoglyceraldehyde to 1,3-bisphospho glyceraldehyde. 

Glycolysis is a redox as well as an aerobic process. It takes place in presence of oxygen that's why this process is known as an aerobic process. In glycolysis oxidation as well as reduction takes place that's why this process is also known as redox process.

The term amphibolic is used to describe a biochemical pathway that involves both catabolism and anabolism. These are the most common ways smaller organic molecules can be formed into more complex ones and applies to the formation of carbs, proteins, lipids, and nucleic acids. Other type called reduction reaction, which involves the adding of hydrogens and electrons to a molecule. it gains calories of energy because energy is released when a hydrocarbon bond is split. Pathways of glycolysis are amphibolic pathways because they provide ATP and chemical intermediates to build new cell material. The fundamental metabolic pathways of biosynthesis are similar in all organisms, in the same way, that protein synthesis or DNA structure are similar in all organisms.

• In first step of glycolysis, glucose is converted in to glucose -6- phosphate by the enzyme Hexokinase or Glucokinase.
  
• Hexokinase is available for all cell where as Glucokinase acts only for liver cell.
• It also require magnesium as cofactor.
• Hexokinase is the major regulatory enzyme of Glycolysis.

Glycolysis, part of cellular respiration, is a series of reactions that constitute the first phase of most carbohydrate catabolism, catabolism meaning the breaking down of larger molecules into smaller ones. The word glycolysis is derived from two Greek words and means the breakdown of something sweet. Glycolysis breaks down glucose and forms pyruvate with the production of two molecules of ATP. The pyruvate end product of glycolysis can be used in either anaerobic respiration if no oxygen is available or in aerobic respiration via the TCA cycle which yields much more usable energy for the cell.

Glycolysis produces a gross total of 4 ATP and a net total of 2 ATP per glucose molecule, regardless of the presence of oxygen.

The most common type of glycolysis is the Embden-Meyerhof-Parnas (EMP pathway), which was discovered by Gustav Embden, Otto Meyerhof, and Jakub Karol Parnas. 

Glycolysis is also known as E.M.P. pathway which stands for Embden - Meyerhof - Parnas Pathway, which was discovered by Gustav Embden, Otto Meyerhof, and Jakub Karol Parnas. Glycolysis splits a 6-carbon sugar, glucose, into two molecules of 3-carbon pyruvate in a series of steps, each catalyzed by a particular enzyme. Glycolysis takes place in the cytoplasm (cytosol) of all living cells, not in mitochondria, and does not require the presence of oxygen. Therefore, glycolysis is also known as cytoplasmic respiration. 

During aerobic respiration, one molecule of glucose is oxidized with the help of six oxygen molecules to produce six molecules of carbon dioxide. Six molecules of water are also produced in the process. During aerobic respiration ATP is produced by the processes of substrate level phosphorylation and oxidative phosphorylation. Combined together these processes produce 38 molecules of ATP by phosphorylating 38 molecules of ADP.

Glycolysis produces NADH, but it does not produce FADH2. FADH2 is produced in the Krebs cycle.

Cellular respiration is stepwise catabolic process that breaks down organic substrates to release energy. The first step in respiration is glycolysis that occurs in the cytoplasm of the living cell. Krebs' cycle and ETS occurs in mitochondria of the cell. So, the answer is 'Cytoplasm'.

Cellular respiration is a complex process that involves multiple pathways. The first step is the glycolysis of glucose which is then followed by Krebs' cycle and ETS in the end. The end products of respiration is CO$ _2$ and H$ _2$O along with release of energy in the form of ATP. Glucose breakdown first starts with glycolysis.

The first step of cellular respiration is the process of glycolysis, a process in which there is breakdown of an organic substance like glucose to pyruvic acid. There is stepwise oxidation of the substrate with the release of energy.

In glycolysis, glucose undergoes partial oxidation to form two molecules of pyruvic acid in a multi-step process catalyzed by various enzymes. In which 2 ATP molecules are obtained and NAD$^+$ into 2 molecules NADH when 2 moles of 1,3-diphosphoglyceraldehyde converts into two moles of 1,3 diphosphoglyceric acid.

Cellular respiration aims at producing energy in the form of ATP and occurs in every living cell. The respiration starts with glycolysis, a stepwise process that oxidises respiratory substrate like glucose. Oxidation is in the form of removal of hydrogen and there is no external electron acceptor present.

Phosphorylation is the addition of a phosphate group to an organic molecule.

Glycolysis is also known as EMP pathway on the name of the scientist who discovered it and they were Embden, Mayerhoff and Parnas.

For bacteria to continue growing rapidly when they are shifted from an environment containing O2 to an anaerobic environment, they must increase the rate of glycolysis. Although the amount of ATP produced by anaerobic glycolysis (2) is very less as compared to ATP produced by aerobic glycolysis (38), glycolysis under anaerobic condition is very quick process. It generates ATP very quickly. 

Glycolysis is the splitting of glucose into two pyruvate molecules. It occurs firstly in the cytoplasm and gains a small amount of energy while the other steps occur in the mitochondria where coenzymes and cytochromes are present, it is also the powerhouse of a cell where energy is generated.

• Glycolysis is the process of partial oxidation of glucose into two molecules of pyruvic acid through the enzyme-mediated reaction series.
• Here two molecules of ATP are utilized. First during the conversion of Glucose to Glucose-6-phosphate and second during the conversion of Fructose-6-phosphate to Fructose-1,6-biphosphate.
• 4 molecules of ATP are synthesized during 2 substrate based phosphorylated reaction. 
• First 2 molecules of ATP released during the conversion of 2 molecules of 1,3 bisphosphoglyceric acid to 2 molecules of 3 phosphoglyceric acids. Next 2 molecules are released during the conversion of 2 molecules of phosphoenolpyruvate to 2 molecules of pyruvic acid. 
• In splitting of one glucose molecule into two pyruvates only the enzymes present in the cytoplasm are used and no oxygen is required. 
• It is an anaerobic process.

The process of cellular respiration occurs into three steps :

Cellular respiration occurs firstly in the cytoplasm and then in mitochondria. Glycolysis occurs in the cytoplasm in which glucose breaks into two pyruvates which are transported to mitochondria through an inner mitochondrial membrane which performs the Krebs cycle. This pyruvate regularly enters the mitochondria to start the Krebs cycle and complete cellular respiration.

Glycolysis is the foremost step in the process of cellular respiration which breakdown glucose molecule to extract energy. It is the part of the metabolism of nearly all the cells and organisms as it is the basic process, it does not require oxygen hence it is anaerobic. it occurs in the cytoplasm of both prokaryotes as well as eukaryotes.

• The process of glycolysis takes place in both prokaryotic and eukaryotic animals as a part of the respiration process to provide the cell with energy.
• The process of glycolysis always takes places in the cytoplasm of any cell where it occurs for 2 reasons. 
• First the enzymes that are required for the process are present in the cytoplasm and secondly any of the membrane bound organelles such as mitochondria are nit present in prokaryotic organisms so if the glycolysis was taking place in mitochondria then the prokaryotes won't be able to preform it.
• Only the reactions of the aerobic respiration such as Kerb's cycle and oxidative phosphorylation takes place in mitochondria to produce ATP.
• Therefore the sentence above is FALSE and the option 'False' is correct.
  

• For the glycolysis to start the glucose molecule is firstly to be converted to Glucose 6 phophaste after that only will the reaction proceed for which ATP is required which is converted to ADP after the conversion.
• So when the amount of the ATP in the cell is reduced and the amount of ADP is increased the process is to be started to provide the cell with the required ATP.
• So the receptors of the cells or the gene that regulate the process of glycolysis are somewhat stimulated by the presence of increased amount of ADP as there are other factors also which control the process of glycolysis such as the amount of ATP, Pyruvic acid etc.
• Therefore it can be said that the ADP is one of the stimulating factors for the Glycolysis process.
• Therefore the correct answer is option 'stimulated by ADP'.

• First part for both type of respiration aerobic and anaerobic is glycolysis where the sugar is broken down to pyruvic acid.
• Glycolysis takes place in the cytoplasm of the cells and does not require for the presnece of any organelles.
• So both kind of organisms are able to perform glycolysis whether they perform aerobic or anaerobic reactions.
• Thus it can be said that in both kind of respiration glycolysis is a common process which provides substrate for further reactions in both kind of respiration. Pyruvic acid which converts to acetyl coA and takes part in kerb cycle while pyruvic acid converts to lactic acid or alcohol in fermentation reaction.
• Therefore the correct answer is option 'Glycolysis'.
  

• The whole process of glycolysis takes place in the cytoplasm it does not require any membrane bound organelles to perform the reaction.
• GLycolysis is the main process to obtain energy in the prokaryotic organisms where there are no membrane bound organelles present and glycolysis is the only source of obatining energy.
• Therefore the enzymes and substrate required for the process of glycolysis are present in the cytoplasm and the whole reaction takes place in the cytoplasm.
• Therefore the answer 'cytoplasm' is correct.
  

• As the reaction of glycolysis takes place in the cytoplasm of cell where it can proceed in the absence of oxygen molecule. 
• It does not require the presence of oxygen of to proceed further.
• It will produce 4 ATP molecules and use 2 molecules of ATP, which gives the cell the net gain of 2 ATP at the end of the glycolysis process.
• Presence of oxygen or absence of oxygen does not hinder the process of glycolysis and prodution of ATP by glycolysis.
• Therefore the answere option 'glycolysis produces equal numbers of ATP molecules regardless of the presence or absence of oxygen' is true.
  

The initial processes for energy generation by prokaryotes included anaerobic processes such as Glycolysis and Fermentation. The latter happening of endosymbiosis was the major revolution in bringing up aerobic respiration with the advent of mitochondria within the cells.

• Glycolysis is the pathway were one molecule of glucose is broken down to 2 molecules of pyruvate by the phosphorylation and dephosphorylation reactions.
• 2 molecules of ATP are used in phosphorylation reaction of glycolysis. First while conversion of glucose to glucose-6-phosphate and the second one during conversion of fructose to fructose1,6-biphosphate.
• While 4 ATP molecules are produced in the dephosphorylation reaction. 2 ATP are produced while conversion of  1,3 bisphosphoglyceric acid to 3-phosphoglyceric acid and another 2 ATP during conversion of phosphophenolepyruvate to pyruvic acid.
• So the net gain of ATP at the end of one glycolysis reaction is 2. SO glycolysis is not a efficient pathway for the production of ATP in animal cells, in turn it is a part of the chain of reaction which take place before aerobic or anaerobic respiration in animal cells.
• Glycolysis provided the reaction of aerobic and anaerobic respiration with the substrates to carry the reaction further and produce ATPs in mitochondria where the prominent reactions for production of energy in animal cell takes place.
• Glycolysis takes place in the cytoplasm of the cell and the product of the glycolysis is transported to the mitochondria.
• Therefore Glycolysis is not the most efficient pathway for ATP production. So the sentence above is FALSE and therefore the option 'False' is correct.
  

• NADH is formed in the glycolysis after the reaction of conversion Glyceradehyde 3 phosphate to 3 phosphoglyeric acid when electrons re released and are accepted by the NAD.
• ATP is formed  while conversion of 1,3 bisphosphoglyceric acid to phospoglyceric acid and also while conversion of phosphophenol to pyruvic acid.
• And pyruvate is the end product of the glycolysis.
• FADH is the product which is formed  during the the kerb cycle while formation of succunic acid to malic acid.
• Thereofte the correct answer is '$FADH _2$'

After fats are digested into fatty acids and glycerol, the following products can take place in cellular respiration.

In the energy conserving phase of glycolysis, the conversion of BPGA to PGA is catalyzed by phosphoglycerate kinase. The phosphate on carbon 1 is transferred to a molecule of ADP, yielding ATP and 3-phosphoglycerate. This type of ATP synthesis, traditionally referred to as substrate-level phosphorylation, involves the direct transfer of a phosphate group from a substrate molecule to ADP, to form ATP.
$1,3-bisphosphoglycerate+ADP\overset{Phosphoglycerate kinase}{\underset{{Mg}^{2+}}{\rightleftharpoons}}3-phosphoglycerate+ATP$

Glycolysis produces 2 ATP, 2 NADH,2 pyruvate molecules. It is the aerobic catabolic breakdown of glucose, which produces energy of 68KJ in form of ATP, NADH, and pyruvate, which itself enters a citric acid cycle to produce more energy.

Glycolysis, part of cellular respiration, is a series of reactions that constitute the first phase of most carbohydrate catabolism. Catabolism means the breaking down of larger molecules into smaller ones. The word glycolysis is derived from two Greek words and means the breakdown of something sweet. Glycolysis breaks down glucose and forms pyruvate with the production of two molecules of ATP. The pyruvate end product of glycolysis can be used in either anaerobic respiration if no oxygen is available or in aerobic respiration via the TCA cycle which yields much more usable energy for the cell.  When oxygen is present, NADH can pass its electrons into the electron transport chain, regenerating NAD$^+$ for use in glycolysis. When oxygen is absent, cells may use other, simpler pathways to regenerate NAD$^+$ these pathways, NADH donates its electrons to an acceptor molecule in a reaction that doesn’t make ATP but does regenerate NAD$^+$ so glycolysis can continue. This process is called fermentation.

During glycolysis process the substrate pyruvic acid is formed from glucose is then oxidized into lactic acid in muscles by pyruvic acid, decarboxylase and alcohol dehydrogenase.

During the process of glycolysis, ATP is utilized and produced but the carbon dioxide and water are not the end products.

NADH is essentially produced only during the cellular respiration and it gets oxidised to release energy in the form of ATP. Glycolysis is a part of cellular respiration and leads to production of NADH. However, photosystem I and II produce NADPH rather than NADH as energy carriers. So the answer is 'Glycolysis'.

Glycolysis takes place in the liquid part of the cytoplasm i.e. cytosol. The most common type of glycolysis is the Embden–Meyerhof–Parnas (EMP pathway), which was discovered by Gustav Embden, Otto Meyerhof, and Jakub Karol Parnas. 

So the correct option is 'Embden, Meyerhof and Parnas.'

Glycolysis takes place in the cytosol of cytoplasm without the involvement of oxygen. The by-product of glycolysis is pyruvate which entered into mitochondria and oxidized oxygen to carbon dioxide.

In glycolysis, the respiratory substrate glucose is oxidised to pyruvic acid to release energy. The enzyme enolase converts phosphoglycerate to phosphoenol pyruvate with the release of H$ _2$O. So, the correct answer is 'Phosphoenol pyruvate'.

There is no utilization oxygen is seen in the process of glycolysis which takes place in the cytoplasm and it is an anaerobic process. After finishing the glycolysis the cell needs to respirate through aerobic respiration in the presence of oxygen. Aerobic reactions occur in the mitochondria which require oxygen.