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There are three things that can produce ATP: chloroplast, cytoplasm, and mitochondria.

There are three ways that ATP can be produced: photophosphorylation, substrate level phosphorylation, and oxidative phosphorylation.

Most of ATP molecules are made from cellular respiration in the cell. Some are produced in the Cytoplasm and some in the inner compartment of the Mitochondria. Production of ATPs usually have 3 phases. We usually produce 36-38 ATPs, but before production of ATP is done you need 2ATP to start

Glycolysis (substrate level phosphorylation, occurs in cytoplasm): breaking of sugar(glucose) produce 2 net ATPs, 2 NADH, and 2 pyruvates(3 carbon molecule c-c-c) I told you is the breaking down of sugar so if glucose is a 6 carbon mole if broken down gives you 3 carbon molecule each call pyruvate.

Kreb or Citric acid cycle (substrate level phosphorylation, occurs in matrix of mitochondria): Prior to citric acid cycle, the pyruvates from glycolysis are converted into acetyl CoA. This then binds with oxyloacetate to form citric acid, hence the name of the cycle. One cycle produces 1 ATP, 3 NADH, and 1 FADH2, but since there are two pyruvates for each glucose, the net products from the Kreb cycle produces 2ATPs, 6 NADH and 2FADH2

Electron transport chain (oxidative phosphorylation, occurs in inner membrane of mitochondria): The NADH and FADH2 act as electron carriers and dumps electrons to a series of proteins and a lipid known as the electron transport chain. As electrons move across the membrane, hydrogen ion exits the membrane, creating a proton gradient, which goes through ATP synthase and attaches to ADP to form the high energy molecule ATP. The electrons are accepted by oxygen at the end of electron transport chain to form water. This by far creates the most ATP molecules.

Light dependent reaction in photosynthesis (photophosphorylation, occurs in thylakoid membrane of chloroplasts): The principle is the same as the electron transport chain, but instead of being dumped by an electron carrier, the present electrons in the thylakoid membrane are excited by sunlight and move across the chain and allow proton gradient to form ATP from ADP.

Light dependent Reaction: 2 ATP.

GLYCOLYSIS: 2 ATPs

KREB CYCLE: 2 ATPs

ETC: 32 ATPs

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