Ch9

fermentation is the partial degradation of sugars, anaerobic. cellular respiration is aerobic, complete the breakdown of a variety of organic molecules. Both use glycolysis as provider of starting material

-Organic + Oxygen --> Carbon + Water + Energy Compounds -C6H12O6 + 6O2 --> 6CO2 + 6H2O + ATP + Heat (energy)

Oxidation is the loss of an electron Reduction is gain of an electron OIL RIG Oxidation is Loss Reduction is Gain

A redox reaction relocates electrons closer to oxygen, such as the burning of methane, releases chemical energy that can do work.

It is a coenzyme and an electron carrier. NAD+ is a good electron carrier bc it can cycle easily between oxidized (NAD) and reduced (NADH) states. As an electron acceptor, NAD+ functions as an oxidizing agent during respiration

Generate an electrochemical proton gradient across a membrane by high energy electrons transferred between molecules in the membrane -- at each transfer, the electrons lose a bit of their energy, which is used to pump protons across the membrane against their concentration gradient. Being charged, the protons cannot diffuse back through the membrane

Glycolysis- cytosol citric acid cycle- mitochondrial matrix oxidative phosphorylation-mitochondrial matrix

Two molecules of ATP are consumed as glucose is split into two three-carbon sugars (glyceraldehyde 3-phosphate).The conversion of these molecules to pyruvate produces two NADH and four ATP by substrate-level phosphorylation. When ATP levels are high in the cell, no metabolic energy production is needed. In this case, PFK's activity is inhibited by allosteric regulation by ATP itself, closing the valve on the flow of carbohydrates through glycolysis.

It occurs when an enzyme transfers a phosphate group from a substrate molecule to ADP, rather than adding an inorganic phosphate to ADP as in oxidative phosphorylation.

They are both during the energy payoff phase Glycolysis step 6: Generation of 1,3-Bisphosphoglycerate catalysed by Glyceraldehyde-3-phosphate dehydrogenase: D-glyceraldehyde-3-phosphate + NAD+ +Pi <=> 1,3-Bisphosphoglycerate + NADH + H+ Glycolysis step 7: Substrate-level phosphorylation, 3-Phosphoglycerate catalysed by Phosphoglycerate kinase: 1,3-Bisphosphoglycerate + ADP <=> 3-Phosphoglycerate + ATP Glycolysis step 10: Substrate-level phosphorylation. Pyruvate synthesis catalysed by Pyruvate kinase: Phosphoenolpyruvate + H+ + ADP -> Pyruvate + ATP

2 molecules of pyruvate left over from glycolysis enter the mitochondrion if oxygen is present. From there, it can then be used by the Krebs Cycle. When it enters the mitochondrion, a multienzyme complex catalyzes these reactions. Pyruvate's carboxyl group is removed and is given off as carbon dioxide, leaving a two-carbon fragment.

This fragment is oxidized to make acetate. The extracted electrons are moved to NAD+ to make NADH that stores energy. Then, coenzyme A attaches to the acetate by an unstable bond, which makes the acetate (acetyl group) very reactive. Pyruvate has now been converted into acetyl coenzyme A (acetyl CoA). Acetyl CoA's acetate can be used by the Krebs Cycle for more oxidation.

ATP, NADH, FADH2, and CO2. It is a cycle because every acetyl that enters the cycle reacts with oxaloacatate. Oxaloacatate is regenerated to start the process over again.

Glucose is completely oxidized after chemiosmosis because that's when the final products of Glycolysis and The Citric Acid Cycle are used creating the final 36 to 38 ATP molecules. The final products that are used are NADH and FADH2 which are needed in the electron transport chain and ultimately Chemiosmosis.

Substrate-level: production of ATP molecules via transfer of a phosphate group from an intermediate high-energy substrate directly to ADP. (Kreb's Cycle and glycolysis) Oxidative: production of ATP molecules from the redox reactions of an electron transport chain(chemiosmosis) Gylcolysis and Krebs cycle use substrate-level phosphorylation.

Electron transport chain uses oxidative phosphorylation.

As electrons pass or slide down the electron transport chain energy is released. This is an exergonic reaction because energy is being released as electrons pass from carrier to carrier in the ETC. This energy is used by ATP synthase to create ATP. This is an endergonic reactions because it needs energy to take place. Energy is needed to produce ATP.

Chemiosmosis involves the pumping of protons through specific passageways in the membranes of the mitochondria from the inner to the outer space. This creates the H+ proton gradient. This influences the H+ to diffuse across the gradient, thus providing energy as the proton is passed down. A hydrogen gradient awaits on either side of the inner mitochondrial membrane and as the H+ are moved through the ETC, energy is released, thus the exergonic reaction. Then when this energy is consumed by the ATP synthase, that would be the endergonic reaction.

While the protons diffuse through it, it spins and ATP synthase makes ATP from ADP and Pi.

The proton gradient is produced by the movement of electrons along the electron transport chain. The chain is an energy converter that uses the exergonic flow of electrons to pump H+ from the matrix into the intermembrane space.

The protons pass back to the matrix through a channel in ATP synthase, using the exergonic flow of H+ to drive the phosphorylation of ADP. Thus, the energy stored in a H+ gradient across a membrane couples the redox reactions of the electron transport chain to ATP synthesis.

Glycolysis 2 net ATP from substrate-level phosphorylation 2 NADH yields 6 ATP (assuming 3 ATP per NADH) by oxidative phosphorylation Transition Reaction 2 NADH yields 6 ATP (assuming 3 ATP per NADH) by oxidative phosphorylation Citric Acid Cycle 2 ATP from substrate-level phosphorylation 6 NADH yields 18 ATP (assuming 3 ATP per NADH) by oxidative phosphorylation 2 FADH2 yields 4 ATP (assuming 2 ATP per FADH2) by oxidative phosphorylation Total Theoretical Maximum Number of ATP Generated per Glucose in Prokaryotes 38 ATP: 4 from substrate-level phosphorylation; 34 from oxidative phosphorylation. In eukaryotic cells, the theoretical maximum yield of ATP generated per glucose is 36 to 38, depending on how the 2 NADH generated in the cytoplasm during glycolysis enter the mitochondria and whether the resulting yield is 2 or 3 ATP per NADH The energy investment stage of glycolysis uses 2 ATP to start glucose oxidation.

In the next step, substrate- level phosphorylation, 4 ATP are made. Making a net of 2 ATP molecules. One cycle off the Krebs Cycle makes 1 ATP molecule through substrate-level phosphorylation. For every glucose consumed, 34 ATPs are produced in electron transport and oxidative phosphorylation.

In total, 38 molecules of ATP are produced.

A catabolic process that makes a limited amount of ATP from glucose without ETC and that produces a characteristic end product, such as ethyl alcohol or lactic acid.

In alcoholic fermentation, pyruvic acid is converted to ethanol. Carbon dioxide is released, and NADH is recycled into NAD+. In lactic acid fermentation, pyruvic acid is converted to lactic acid.

NADH is recycled into NAD+

Fermentation is the process of deriving energy from the oxidation of organic compounds, such as carbohydrates, using an endogenous electron acceptor, which is usually an organic compound. This is in contrast to cellular respiration, where electrons are donated to an exogenous electron acceptor, such as oxygen, via an electron transport chain Oxygen is a reactant in cellular respiration but not in fermentation. Also, fermentation produces ATP without the use of an electron transport chain

It occurs, with variations, in nearly all organisms, both aerobic and anaerobic.

The wide occurrence of glycolysis indicates that it is one of the most ancient known metabolic pathways. It occurs in the cytosol of the cell.

Each NADH and FADH2 molecule formed represents stored energy... contain high energy electrons from food molecules which are carried to an electron transport chain; Plants manufacture their own food by photosynthesis using energy from sunlight.

Cells harvest the chemical energy stored in organic molecules and use it to regenerate ATP, the molecule that drives most cellular work. ADP + P + energy ATP

Glycolysis and the citric acid cycle contribute by making ATP, they also generate electrons for the Electron Transport Chain (ETC). The ETC then uses those electrons to make a proton gradient in the mitochondria which in turn powers the enzyme ATP-synthase to make a whole bunch of ATP.

Phosphofructokinase (PFK) is a glycolytic enzyme that catalyzes the irreversible transfer of a phosphate from ATP to fructose-6-phosphate: fructose-6-phosphate + ATP fructose-1,6-bisphosphate + ADP In part because of the irreversible nature of this step in glycolysis, PFK is the key regulatory enzyme for glycolysis. When ATP levels are high in the cell, the cell no longer needs metabolic energy production to occur.

In this case, PFK's activity is inhibited by allosteric regulation by ATP itself, closing the valve on the flow of carbohydrates through glycolysis.