a. Draw out the electron transport chain in the order the electrons flow. b. Which are...
a. Draw out the electron transport chain in the order the electrons flow.
b. Which are mobile carriers?
c. Which proteins pump protons into the inter membrane space?
d.Describe how the proton motive force is used to make ATP?
Homework Answers
Answer a: Electron Transport Chain (ETC) of mitochondria consists of a series of complexes that transfer electrons from a donor (NADH or FADH2) to an electron acceptor (O2) respective of their redox potential. During this process, the counter charge of the electron (protons; H+ ions) transfers across the membrane. The transfer of an electron from electron transport complex (ET) - I to IV develop a potential gradient across the mitochondrial membrane. In this process of electron flow from complex-I to complex-IV mobile carriers are also involved (Coenzyme-Q and Cytochrome-C).
Answer b: Coenzyme-Q (CoQ) and Cytochrome-C (Cyt-C)
Answer c: Proton gradient pump
Answer d: The electron transport in the mitochondrial membrane is coupled with ATP synthesis against the potential gradient. During electron flow from Complex-I to complex-IV proton (H+ ions) pumped in intramembranous space of mitochondria, due to this a high proton concentration gradient in intramembranous space is created which is released by passing of protons (H+ ions) from intramembranous space to inside (matrix) of the mitochondria through ATP synthesizing complex. The released energy during this process used for the synthesis of ATP.
Flow diagram see in the figure below
Add Answer to:
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