Krebs Cycle and mitochondira ETC
Updated: 5/21/2020
Krebs Cycle and mitochondira ETC
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  • next is the Krebs Cycle. This is when energy is extracted from the sugar
  • Krebs Cycle
  • Preparatory phase steps:1. As each pyruvic acid is broken down, a pair of electrons(and proton) are passed to NAD, producing NADH2. A carbon and 2 oxygen atoms get released as Co23. Coenzyme A itself to remaining molecule , creating Acytal CoA
  • The preparatory phase is very important. Pyruvic acid become something called Acytal CoA.
  • this is happening in the mitochondrial matrix
  • used by aerobic organisms!
  • 2 ATP, 8 NADH, 2 FADH2 formed
  • Great! So after Acytal CoA is made the main steps of the Kreb cycle begin.
  • 3. oxaloacetate is re-formed, ATP generated, and more high-energy electron carriers are formedthe remaining 4 carbon molecule is rearranged to form oxaloacetate. ATP is formed, and electrons are passed to NADH and FADH2
  • 1. An Acetyl CoA molecule enters the cycle and binds to oxaloacetate, creating a 6 carbon molecule
  • 2. the 6 carbon molecule donates electrons NAD+, creating NADH. Two Co2 molecules are released into the atmosphere
  • this is happening in the inner mitochondrial matrix
  • Mitochondrial ETC
  • After the Krebs Cycle, there is another ETC, just like in photosynthesis!
  • 1. the electrons fall to a lower energy state, which releases energy2. the energy is used to power proton pumps, which pack H+ ions from the mitochondrial matrix into the inter-membrane space 3. At the end of the chain, the lower energy electrons are handed off to oxygen- which then combines with free H+ to make water 4. The protons rush back into the mitochondrial matrix with lots of kinetic energy, which can be used to build ATP
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